/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-de41.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:45:40,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:45:40,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:45:40,933 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:45:40,976 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:45:40,977 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:45:40,978 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:45:40,979 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:45:40,990 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:45:40,990 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:45:40,994 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:45:40,994 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:45:40,995 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:45:40,995 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:45:40,995 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:45:40,995 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:45:40,995 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:45:40,995 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:45:40,996 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:45:40,996 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:45:41,160 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:45:41,175 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:45:41,176 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:45:41,177 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:45:41,178 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:45:41,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de41.c [2022-03-20 18:45:41,224 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9da7432/e6e653cc07fa4c80849398120933eaa0/FLAG52ed78098 [2022-03-20 18:45:41,579 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:45:41,579 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de41.c [2022-03-20 18:45:41,583 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9da7432/e6e653cc07fa4c80849398120933eaa0/FLAG52ed78098 [2022-03-20 18:45:42,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e9da7432/e6e653cc07fa4c80849398120933eaa0 [2022-03-20 18:45:42,017 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:45:42,018 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:45:42,021 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:45:42,021 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:45:42,025 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:45:42,026 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c8ef1b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42, skipping insertion in model container [2022-03-20 18:45:42,027 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,032 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:45:42,044 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:45:42,204 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-de41.c[368,381] [2022-03-20 18:45:42,218 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:45:42,228 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:45:42,235 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-de41.c[368,381] [2022-03-20 18:45:42,237 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:45:42,257 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:45:42,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42 WrapperNode [2022-03-20 18:45:42,257 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:45:42,258 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:45:42,258 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:45:42,258 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:45:42,265 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,269 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,269 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,272 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,274 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,275 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:45:42,276 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:45:42,276 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:45:42,276 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:45:42,277 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (1/1) ... [2022-03-20 18:45:42,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:45:42,306 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:42,329 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:45:42,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:45:42,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:45:42,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:45:42,383 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:45:42,384 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:45:42,384 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 18:45:42,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:45:42,386 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:45:42,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:45:42,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:45:42,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:45:42,388 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:45:42,389 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:45:42,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:45:42,460 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:45:42,462 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:45:42,587 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:45:42,591 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:45:42,591 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2022-03-20 18:45:42,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:45:42 BoogieIcfgContainer [2022-03-20 18:45:42,592 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:45:42,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:45:42,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:45:42,596 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:45:42,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:45:42" (1/3) ... [2022-03-20 18:45:42,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5044cd34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:45:42, skipping insertion in model container [2022-03-20 18:45:42,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:45:42" (2/3) ... [2022-03-20 18:45:42,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5044cd34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:45:42, skipping insertion in model container [2022-03-20 18:45:42,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:45:42" (3/3) ... [2022-03-20 18:45:42,597 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de41.c [2022-03-20 18:45:42,601 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:45:42,601 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:45:42,628 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:45:42,632 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:45:42,633 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:45:42,648 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:45:42,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:45:42,653 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:42,654 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:42,654 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:42,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:42,657 INFO L85 PathProgramCache]: Analyzing trace with hash 2066875484, now seen corresponding path program 1 times [2022-03-20 18:45:42,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:42,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [857078241] [2022-03-20 18:45:42,671 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:45:42,671 INFO L85 PathProgramCache]: Analyzing trace with hash 2066875484, now seen corresponding path program 2 times [2022-03-20 18:45:42,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:42,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870192669] [2022-03-20 18:45:42,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:42,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:42,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:42,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:42,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:42,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:42,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:42,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870192669] [2022-03-20 18:45:42,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870192669] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:42,819 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:42,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:45:42,821 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:42,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [857078241] [2022-03-20 18:45:42,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [857078241] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:42,822 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:42,822 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:45:42,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475383177] [2022-03-20 18:45:42,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:42,826 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:45:42,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:42,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:45:42,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:45:42,849 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:42,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:42,876 INFO L93 Difference]: Finished difference Result 39 states and 54 transitions. [2022-03-20 18:45:42,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:45:42,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 18:45:42,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:42,882 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:45:42,882 INFO L226 Difference]: Without dead ends: 16 [2022-03-20 18:45:42,883 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:45:42,886 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 17 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:42,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 28 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:45:42,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-20 18:45:42,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-20 18:45:42,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:42,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-03-20 18:45:42,913 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 15 [2022-03-20 18:45:42,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:42,914 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-03-20 18:45:42,914 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:42,914 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-03-20 18:45:42,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:45:42,915 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:42,916 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:42,916 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:45:42,916 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:42,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:42,917 INFO L85 PathProgramCache]: Analyzing trace with hash 2063181400, now seen corresponding path program 1 times [2022-03-20 18:45:42,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:42,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [614749241] [2022-03-20 18:45:42,918 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:45:42,918 INFO L85 PathProgramCache]: Analyzing trace with hash 2063181400, now seen corresponding path program 2 times [2022-03-20 18:45:42,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:42,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038617477] [2022-03-20 18:45:42,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:42,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:42,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:43,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:43,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:43,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:43,201 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:43,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038617477] [2022-03-20 18:45:43,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038617477] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:43,201 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:43,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:43,201 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:43,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [614749241] [2022-03-20 18:45:43,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [614749241] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:43,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:43,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:43,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318446012] [2022-03-20 18:45:43,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:43,202 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:43,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:43,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:43,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:45:43,203 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:43,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:43,329 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2022-03-20 18:45:43,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:45:43,329 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 18:45:43,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:43,330 INFO L225 Difference]: With dead ends: 35 [2022-03-20 18:45:43,330 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 18:45:43,331 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:45:43,331 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:43,332 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 33 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:43,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 18:45:43,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 18:45:43,337 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) [2022-03-20 18:45:43,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-03-20 18:45:43,338 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2022-03-20 18:45:43,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:43,338 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-03-20 18:45:43,338 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:43,338 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-03-20 18:45:43,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:45:43,339 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:43,339 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:43,339 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:45:43,340 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:43,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:43,340 INFO L85 PathProgramCache]: Analyzing trace with hash 570818913, now seen corresponding path program 1 times [2022-03-20 18:45:43,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:43,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1138613941] [2022-03-20 18:45:43,754 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:43,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1649432706, now seen corresponding path program 1 times [2022-03-20 18:45:43,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:43,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778207941] [2022-03-20 18:45:43,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:43,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:43,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:44,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:44,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:44,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:44,182 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:44,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778207941] [2022-03-20 18:45:44,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778207941] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:44,183 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:44,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:45:44,268 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:44,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1138613941] [2022-03-20 18:45:44,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1138613941] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:44,269 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:44,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:45:44,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712118157] [2022-03-20 18:45:44,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:44,269 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:45:44,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:44,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:45:44,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:45:44,270 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 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) [2022-03-20 18:45:44,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:44,604 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2022-03-20 18:45:44,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:45:44,605 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 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 [2022-03-20 18:45:44,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:44,606 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:45:44,606 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:45:44,607 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:45:44,608 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 43 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:44,608 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 43 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:44,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:45:44,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 25. [2022-03-20 18:45:44,616 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) [2022-03-20 18:45:44,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-03-20 18:45:44,617 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 16 [2022-03-20 18:45:44,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:44,618 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-03-20 18:45:44,618 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 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) [2022-03-20 18:45:44,618 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-03-20 18:45:44,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:45:44,618 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:44,618 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:44,619 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:45:44,619 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:44,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:44,619 INFO L85 PathProgramCache]: Analyzing trace with hash -417354376, now seen corresponding path program 1 times [2022-03-20 18:45:44,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:44,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [152064053] [2022-03-20 18:45:44,811 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:44,812 INFO L85 PathProgramCache]: Analyzing trace with hash 2129640343, now seen corresponding path program 1 times [2022-03-20 18:45:44,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:44,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483906326] [2022-03-20 18:45:44,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:44,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:44,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:44,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:44,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:44,945 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:44,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483906326] [2022-03-20 18:45:44,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483906326] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:44,946 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:44,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:45,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:45,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [152064053] [2022-03-20 18:45:45,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [152064053] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:45,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261018988] [2022-03-20 18:45:45,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:45,027 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:45,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:45,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:45:45,028 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:45,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:45,118 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-03-20 18:45:45,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:45:45,119 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:45:45,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:45,120 INFO L225 Difference]: With dead ends: 36 [2022-03-20 18:45:45,120 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 18:45:45,121 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:45:45,125 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 24 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:45,127 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 42 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 27 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2022-03-20 18:45:45,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 18:45:45,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 18:45:45,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 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) [2022-03-20 18:45:45,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2022-03-20 18:45:45,146 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 17 [2022-03-20 18:45:45,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:45,146 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2022-03-20 18:45:45,147 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:45,147 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2022-03-20 18:45:45,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:45:45,147 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:45,148 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:45,148 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:45:45,148 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:45,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:45,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1952840614, now seen corresponding path program 1 times [2022-03-20 18:45:45,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1072019674] [2022-03-20 18:45:45,308 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:45,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1646204965, now seen corresponding path program 1 times [2022-03-20 18:45:45,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:45,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286111658] [2022-03-20 18:45:45,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:45,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:45,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:45,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286111658] [2022-03-20 18:45:45,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286111658] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,397 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:45:45,412 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:45,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1072019674] [2022-03-20 18:45:45,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1072019674] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:45:45,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409430944] [2022-03-20 18:45:45,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:45,414 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:45:45,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:45:45,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:45:45,415 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:45,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:45,521 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-03-20 18:45:45,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:45:45,522 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-20 18:45:45,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:45,522 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:45:45,522 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:45:45,523 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:45:45,523 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:45,523 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 33 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:45,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:45:45,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-03-20 18:45:45,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:45,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2022-03-20 18:45:45,533 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 17 [2022-03-20 18:45:45,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:45,533 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2022-03-20 18:45:45,533 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:45,533 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2022-03-20 18:45:45,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:45:45,534 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:45,535 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:45,535 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 18:45:45,535 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:45,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:45,536 INFO L85 PathProgramCache]: Analyzing trace with hash 17779232, now seen corresponding path program 2 times [2022-03-20 18:45:45,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1530351527] [2022-03-20 18:45:45,678 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:45,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1871063831, now seen corresponding path program 1 times [2022-03-20 18:45:45,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:45,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731379683] [2022-03-20 18:45:45,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:45,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:45,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:45,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:45,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:45,808 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:45,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731379683] [2022-03-20 18:45:45,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731379683] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,808 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:45,925 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:45,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1530351527] [2022-03-20 18:45:45,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1530351527] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:45,926 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:45,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:45:45,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697295621] [2022-03-20 18:45:45,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:45,926 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:45:45,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:45,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:45:45,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:45:45,927 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:46,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:46,018 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2022-03-20 18:45:46,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:45:46,019 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:45:46,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:46,019 INFO L225 Difference]: With dead ends: 32 [2022-03-20 18:45:46,019 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 18:45:46,019 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=150, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:45:46,020 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 19 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:46,020 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 37 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:45:46,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 18:45:46,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 18:45:46,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:46,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-03-20 18:45:46,024 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 18 [2022-03-20 18:45:46,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:46,024 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-03-20 18:45:46,024 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:46,024 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-03-20 18:45:46,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:45:46,024 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:46,024 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:46,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:45:46,025 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:46,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:46,025 INFO L85 PathProgramCache]: Analyzing trace with hash -58627519, now seen corresponding path program 1 times [2022-03-20 18:45:46,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:46,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [980477159] [2022-03-20 18:45:46,155 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:46,155 INFO L85 PathProgramCache]: Analyzing trace with hash 944061986, now seen corresponding path program 1 times [2022-03-20 18:45:46,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:46,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136916361] [2022-03-20 18:45:46,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:46,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,215 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:46,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:46,220 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:46,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136916361] [2022-03-20 18:45:46,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136916361] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:46,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773247019] [2022-03-20 18:45:46,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:46,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:46,222 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:46,236 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:45:46,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 18:45:46,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:46,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:46,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:46,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:46,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773247019] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:46,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-20 18:45:46,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 7 [2022-03-20 18:45:46,430 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:46,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [980477159] [2022-03-20 18:45:46,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [980477159] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:46,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:46,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:45:46,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27372753] [2022-03-20 18:45:46,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:46,432 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:45:46,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:46,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:45:46,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:45:46,432 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2022-03-20 18:45:46,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:46,468 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2022-03-20 18:45:46,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:45:46,468 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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 [2022-03-20 18:45:46,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:46,469 INFO L225 Difference]: With dead ends: 27 [2022-03-20 18:45:46,469 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 18:45:46,469 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:45:46,470 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 4 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:46,470 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 48 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:45:46,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 18:45:46,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-03-20 18:45:46,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:46,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-03-20 18:45:46,476 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 18 [2022-03-20 18:45:46,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:46,476 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-03-20 18:45:46,476 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 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) [2022-03-20 18:45:46,476 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-03-20 18:45:46,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:45:46,476 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:46,476 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:46,526 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:46,711 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:46,712 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:46,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:46,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1344200880, now seen corresponding path program 1 times [2022-03-20 18:45:46,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:46,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1775389641] [2022-03-20 18:45:46,862 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:46,862 INFO L85 PathProgramCache]: Analyzing trace with hash -988846895, now seen corresponding path program 1 times [2022-03-20 18:45:46,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:46,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22422814] [2022-03-20 18:45:46,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:46,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:46,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:46,932 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:46,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22422814] [2022-03-20 18:45:46,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22422814] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:46,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951857886] [2022-03-20 18:45:46,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:46,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:46,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:46,948 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:46,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:45:46,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:46,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:45:46,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:47,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:47,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:47,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:47,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951857886] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:47,241 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:47,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 18 [2022-03-20 18:45:47,299 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:47,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1775389641] [2022-03-20 18:45:47,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1775389641] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:47,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:47,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:47,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497073096] [2022-03-20 18:45:47,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:47,300 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:47,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:47,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:47,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:45:47,300 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:47,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:47,443 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2022-03-20 18:45:47,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:45:47,444 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 18:45:47,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:47,444 INFO L225 Difference]: With dead ends: 29 [2022-03-20 18:45:47,444 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:45:47,445 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:45:47,445 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 20 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:47,445 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 40 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:47,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:45:47,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-03-20 18:45:47,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:47,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2022-03-20 18:45:47,450 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 18 [2022-03-20 18:45:47,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:47,450 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2022-03-20 18:45:47,450 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:47,450 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2022-03-20 18:45:47,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:45:47,451 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:47,451 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:47,469 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:47,669 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-03-20 18:45:47,669 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:47,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:47,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1244950584, now seen corresponding path program 1 times [2022-03-20 18:45:47,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:47,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [732093617] [2022-03-20 18:45:47,798 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:47,799 INFO L85 PathProgramCache]: Analyzing trace with hash -883628153, now seen corresponding path program 1 times [2022-03-20 18:45:47,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:47,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59092878] [2022-03-20 18:45:47,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:47,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:47,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:48,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:48,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:48,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:48,013 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:48,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59092878] [2022-03-20 18:45:48,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59092878] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:48,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449268253] [2022-03-20 18:45:48,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:48,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:48,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:48,035 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:48,077 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:45:48,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:48,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 18:45:48,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:48,453 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:48,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:48,986 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:48,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449268253] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:48,987 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:48,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11] total 26 [2022-03-20 18:45:49,054 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:49,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [732093617] [2022-03-20 18:45:49,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [732093617] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:49,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:49,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:45:49,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338711315] [2022-03-20 18:45:49,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:49,055 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:45:49,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:49,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:45:49,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:45:49,056 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 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) [2022-03-20 18:45:49,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:49,328 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-03-20 18:45:49,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:45:49,328 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 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 [2022-03-20 18:45:49,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:49,329 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:45:49,329 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:45:49,330 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 23 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=229, Invalid=1031, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:45:49,330 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:49,331 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 54 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:49,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:45:49,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-03-20 18:45:49,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:49,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2022-03-20 18:45:49,336 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 19 [2022-03-20 18:45:49,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:49,336 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2022-03-20 18:45:49,337 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 9 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) [2022-03-20 18:45:49,337 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2022-03-20 18:45:49,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:45:49,337 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:49,337 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:49,383 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:49,547 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:49,548 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:49,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:49,548 INFO L85 PathProgramCache]: Analyzing trace with hash -343761690, now seen corresponding path program 2 times [2022-03-20 18:45:49,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:49,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1947503776] [2022-03-20 18:45:49,640 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:49,640 INFO L85 PathProgramCache]: Analyzing trace with hash -311079835, now seen corresponding path program 1 times [2022-03-20 18:45:49,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:49,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649652308] [2022-03-20 18:45:49,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:49,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:49,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:49,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:49,710 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:49,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649652308] [2022-03-20 18:45:49,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649652308] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:49,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022453563] [2022-03-20 18:45:49,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:49,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:49,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:49,714 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:49,751 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:45:49,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:49,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:45:49,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:49,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:49,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:49,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:49,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022453563] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:49,918 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:49,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-20 18:45:49,932 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:49,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1947503776] [2022-03-20 18:45:49,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1947503776] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:49,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:49,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:49,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631729149] [2022-03-20 18:45:49,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:49,933 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:49,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:49,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:49,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:45:49,934 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2022-03-20 18:45:50,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:50,077 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2022-03-20 18:45:50,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:45:50,077 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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 [2022-03-20 18:45:50,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:50,078 INFO L225 Difference]: With dead ends: 37 [2022-03-20 18:45:50,078 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:45:50,078 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:45:50,079 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 22 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:50,079 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 43 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:50,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:45:50,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2022-03-20 18:45:50,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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) [2022-03-20 18:45:50,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-03-20 18:45:50,085 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2022-03-20 18:45:50,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:50,085 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-03-20 18:45:50,085 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2022-03-20 18:45:50,085 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-03-20 18:45:50,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:45:50,086 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:50,086 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:50,114 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:50,286 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:50,286 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:50,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:50,287 INFO L85 PathProgramCache]: Analyzing trace with hash 95732656, now seen corresponding path program 2 times [2022-03-20 18:45:50,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [238146027] [2022-03-20 18:45:50,446 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:50,447 INFO L85 PathProgramCache]: Analyzing trace with hash -489053103, now seen corresponding path program 1 times [2022-03-20 18:45:50,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:50,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038627783] [2022-03-20 18:45:50,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:50,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:50,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:50,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:50,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:50,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038627783] [2022-03-20 18:45:50,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038627783] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:50,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185203472] [2022-03-20 18:45:50,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:50,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:50,485 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:50,498 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:50,500 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:45:50,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:50,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 18:45:50,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:50,599 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:50,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:50,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:50,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185203472] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:50,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:50,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-03-20 18:45:50,651 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:50,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [238146027] [2022-03-20 18:45:50,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [238146027] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:50,651 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:50,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:45:50,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134123026] [2022-03-20 18:45:50,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:50,652 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:45:50,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:45:50,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:45:50,652 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:50,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:50,731 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2022-03-20 18:45:50,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:45:50,742 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 18:45:50,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:50,742 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:45:50,743 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:45:50,743 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:45:50,743 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 30 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:50,744 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 27 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:45:50,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:45:50,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2022-03-20 18:45:50,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:50,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2022-03-20 18:45:50,753 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 20 [2022-03-20 18:45:50,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:50,753 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2022-03-20 18:45:50,753 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:50,753 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2022-03-20 18:45:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:45:50,753 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:50,753 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:50,772 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:50,970 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 18:45:50,970 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:50,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:50,971 INFO L85 PathProgramCache]: Analyzing trace with hash 633740065, now seen corresponding path program 3 times [2022-03-20 18:45:50,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:50,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [705844494] [2022-03-20 18:45:51,063 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:51,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1548968958, now seen corresponding path program 1 times [2022-03-20 18:45:51,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:51,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537065567] [2022-03-20 18:45:51,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:51,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:51,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:51,152 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:51,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537065567] [2022-03-20 18:45:51,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537065567] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:51,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973627904] [2022-03-20 18:45:51,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:51,153 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:51,154 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:51,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:45:51,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:45:51,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:51,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:51,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:51,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:51,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973627904] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:51,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:51,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-20 18:45:51,359 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:51,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [705844494] [2022-03-20 18:45:51,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [705844494] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:51,359 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:51,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:45:51,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172514713] [2022-03-20 18:45:51,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:51,360 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:45:51,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:51,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:45:51,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:45:51,360 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:51,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:51,521 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2022-03-20 18:45:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:45:51,521 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 18:45:51,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:51,522 INFO L225 Difference]: With dead ends: 33 [2022-03-20 18:45:51,522 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:45:51,522 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:45:51,522 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 18 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:51,523 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 40 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:51,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:45:51,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2022-03-20 18:45:51,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:51,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-03-20 18:45:51,527 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 20 [2022-03-20 18:45:51,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:51,527 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-03-20 18:45:51,527 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:51,527 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-03-20 18:45:51,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:45:51,528 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:51,528 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:51,561 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:51,745 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:51,745 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:51,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:51,746 INFO L85 PathProgramCache]: Analyzing trace with hash -629354303, now seen corresponding path program 3 times [2022-03-20 18:45:51,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:51,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1854414550] [2022-03-20 18:45:51,844 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:51,845 INFO L85 PathProgramCache]: Analyzing trace with hash -115019294, now seen corresponding path program 1 times [2022-03-20 18:45:51,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:51,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537554289] [2022-03-20 18:45:51,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:51,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:51,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:51,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:51,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537554289] [2022-03-20 18:45:51,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537554289] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:51,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767937268] [2022-03-20 18:45:51,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:51,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:51,893 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:51,894 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:51,895 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:45:51,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:51,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 18:45:51,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:51,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:51,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:52,053 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:52,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767937268] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:52,054 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:52,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-20 18:45:52,067 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:52,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1854414550] [2022-03-20 18:45:52,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1854414550] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:52,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:52,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:45:52,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979950808] [2022-03-20 18:45:52,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:52,068 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:45:52,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:52,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:45:52,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:45:52,069 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2022-03-20 18:45:52,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:52,193 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2022-03-20 18:45:52,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:45:52,194 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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 20 [2022-03-20 18:45:52,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:52,194 INFO L225 Difference]: With dead ends: 37 [2022-03-20 18:45:52,194 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:45:52,195 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:45:52,195 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 24 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:52,195 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 32 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:52,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:45:52,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2022-03-20 18:45:52,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 22 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) [2022-03-20 18:45:52,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-03-20 18:45:52,204 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 20 [2022-03-20 18:45:52,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:52,204 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-03-20 18:45:52,204 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2022-03-20 18:45:52,204 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-03-20 18:45:52,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:45:52,205 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:52,205 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:52,241 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:52,422 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:52,422 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:52,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:52,422 INFO L85 PathProgramCache]: Analyzing trace with hash 1999348183, now seen corresponding path program 4 times [2022-03-20 18:45:52,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:52,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1300993311] [2022-03-20 18:45:52,557 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:52,558 INFO L85 PathProgramCache]: Analyzing trace with hash -1527116650, now seen corresponding path program 1 times [2022-03-20 18:45:52,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:52,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680272290] [2022-03-20 18:45:52,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:52,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:52,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:52,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:52,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:52,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:52,647 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:52,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680272290] [2022-03-20 18:45:52,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680272290] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:52,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764390230] [2022-03-20 18:45:52,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:52,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:52,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:52,648 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:52,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:45:52,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:52,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 18:45:52,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:52,808 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:52,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:53,005 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-20 18:45:53,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764390230] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:53,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:53,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 17 [2022-03-20 18:45:53,080 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:53,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1300993311] [2022-03-20 18:45:53,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1300993311] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:53,081 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:53,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:45:53,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960357320] [2022-03-20 18:45:53,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:53,081 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:45:53,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:53,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:45:53,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:45:53,082 INFO L87 Difference]: Start difference. First operand 27 states and 33 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) [2022-03-20 18:45:53,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:53,368 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2022-03-20 18:45:53,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:45:53,368 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 21 [2022-03-20 18:45:53,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:53,369 INFO L225 Difference]: With dead ends: 38 [2022-03-20 18:45:53,369 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:45:53,369 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=130, Invalid=572, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:45:53,370 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 22 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:53,370 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 35 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:53,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:45:53,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2022-03-20 18:45:53,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:53,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2022-03-20 18:45:53,377 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 21 [2022-03-20 18:45:53,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:53,377 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2022-03-20 18:45:53,377 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) [2022-03-20 18:45:53,377 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2022-03-20 18:45:53,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:45:53,378 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:53,378 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:53,397 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:53,590 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 18:45:53,591 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:53,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:53,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1884746625, now seen corresponding path program 5 times [2022-03-20 18:45:53,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:53,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [237182762] [2022-03-20 18:45:53,712 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:53,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1932554466, now seen corresponding path program 1 times [2022-03-20 18:45:53,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:53,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887194217] [2022-03-20 18:45:53,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:53,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:53,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:53,971 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:53,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:53,974 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:53,974 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:53,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887194217] [2022-03-20 18:45:53,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887194217] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:53,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206708065] [2022-03-20 18:45:53,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:53,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:53,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:53,976 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:53,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:45:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:54,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 18:45:54,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:54,691 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:54,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:56,284 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:56,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206708065] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:56,284 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:56,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 39 [2022-03-20 18:45:56,441 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:56,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [237182762] [2022-03-20 18:45:56,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [237182762] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:56,442 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:56,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:45:56,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661153483] [2022-03-20 18:45:56,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:56,442 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:45:56,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:56,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:45:56,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1306, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:45:56,443 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 15 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:57,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:57,018 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2022-03-20 18:45:57,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:45:57,018 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 18:45:57,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:57,019 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:45:57,019 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:45:57,020 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 830 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=501, Invalid=2255, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:45:57,020 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:57,020 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 52 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:45:57,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:45:57,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-03-20 18:45:57,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:57,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2022-03-20 18:45:57,028 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 22 [2022-03-20 18:45:57,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:57,028 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2022-03-20 18:45:57,028 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:57,028 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2022-03-20 18:45:57,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:45:57,028 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:57,029 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:57,045 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:57,243 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 18:45:57,244 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:57,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:57,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1383526881, now seen corresponding path program 6 times [2022-03-20 18:45:57,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:57,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [408466851] [2022-03-20 18:45:57,361 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:57,361 INFO L85 PathProgramCache]: Analyzing trace with hash -869597310, now seen corresponding path program 1 times [2022-03-20 18:45:57,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:57,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035953459] [2022-03-20 18:45:57,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:57,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:57,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:57,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:57,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035953459] [2022-03-20 18:45:57,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035953459] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:57,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111269340] [2022-03-20 18:45:57,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:57,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:57,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:57,432 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:57,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:45:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:57,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:45:57,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:57,525 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:57,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:57,626 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:57,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111269340] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:57,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:57,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-20 18:45:57,644 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:57,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [408466851] [2022-03-20 18:45:57,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [408466851] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:57,645 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:57,645 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:45:57,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28755023] [2022-03-20 18:45:57,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:57,645 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:45:57,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:57,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:45:57,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:45:57,646 INFO L87 Difference]: Start difference. First operand 32 states and 38 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) [2022-03-20 18:45:57,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:57,987 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2022-03-20 18:45:57,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:45:57,988 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 22 [2022-03-20 18:45:57,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:57,989 INFO L225 Difference]: With dead ends: 56 [2022-03-20 18:45:57,989 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 18:45:57,990 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 46 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=152, Invalid=550, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:45:57,990 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:57,990 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 51 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:57,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 18:45:58,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 39. [2022-03-20 18:45:58,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:58,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2022-03-20 18:45:58,012 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 22 [2022-03-20 18:45:58,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:58,012 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2022-03-20 18:45:58,012 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) [2022-03-20 18:45:58,012 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2022-03-20 18:45:58,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:45:58,016 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:58,016 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:58,033 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:58,224 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 18:45:58,224 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:58,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:58,224 INFO L85 PathProgramCache]: Analyzing trace with hash 512162856, now seen corresponding path program 7 times [2022-03-20 18:45:58,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:58,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [301552280] [2022-03-20 18:45:58,314 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:58,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1070340711, now seen corresponding path program 1 times [2022-03-20 18:45:58,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:58,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196461467] [2022-03-20 18:45:58,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:58,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:58,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:58,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:58,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:58,425 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:45:58,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:58,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196461467] [2022-03-20 18:45:58,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196461467] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:58,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931884795] [2022-03-20 18:45:58,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:58,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:58,425 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:58,426 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:58,427 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:45:58,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:58,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 18:45:58,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:58,510 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:45:58,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:58,592 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:45:58,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931884795] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:58,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:58,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 14 [2022-03-20 18:45:58,650 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:58,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [301552280] [2022-03-20 18:45:58,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [301552280] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:58,650 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:58,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:45:58,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913125880] [2022-03-20 18:45:58,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:58,651 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:45:58,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:58,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:45:58,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:45:58,651 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 10 states, 10 states have (on average 1.7) 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) [2022-03-20 18:45:59,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:59,014 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2022-03-20 18:45:59,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:45:59,014 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) 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 23 [2022-03-20 18:45:59,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:59,015 INFO L225 Difference]: With dead ends: 57 [2022-03-20 18:45:59,015 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 18:45:59,015 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:45:59,016 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 40 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:59,016 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 42 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:45:59,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 18:45:59,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2022-03-20 18:45:59,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 34 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:45:59,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2022-03-20 18:45:59,025 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 23 [2022-03-20 18:45:59,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:59,026 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2022-03-20 18:45:59,026 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) 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) [2022-03-20 18:45:59,026 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2022-03-20 18:45:59,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:45:59,026 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:59,026 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:59,045 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:59,243 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 18:45:59,243 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:59,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:59,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1413378482, now seen corresponding path program 8 times [2022-03-20 18:45:59,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:59,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1670530204] [2022-03-20 18:45:59,336 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:45:59,337 INFO L85 PathProgramCache]: Analyzing trace with hash -2045469805, now seen corresponding path program 1 times [2022-03-20 18:45:59,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:59,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351905454] [2022-03-20 18:45:59,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:59,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:59,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:59,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,458 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:59,458 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:59,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351905454] [2022-03-20 18:45:59,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351905454] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:59,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880653389] [2022-03-20 18:45:59,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:59,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:59,459 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:59,476 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:45:59,478 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:45:59,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:59,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:45:59,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:59,599 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:59,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:59,776 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:45:59,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880653389] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:59,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:59,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-03-20 18:45:59,796 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:59,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1670530204] [2022-03-20 18:45:59,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1670530204] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:59,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:59,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:45:59,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916161688] [2022-03-20 18:45:59,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:59,796 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:45:59,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:59,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:45:59,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:45:59,797 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:00,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:00,626 INFO L93 Difference]: Finished difference Result 73 states and 90 transitions. [2022-03-20 18:46:00,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:46:00,626 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-20 18:46:00,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:00,627 INFO L225 Difference]: With dead ends: 73 [2022-03-20 18:46:00,627 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 18:46:00,627 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=271, Invalid=1061, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:46:00,628 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 51 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:00,628 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 61 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:46:00,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 18:46:00,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2022-03-20 18:46:00,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.255813953488372) internal successors, (54), 43 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:00,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2022-03-20 18:46:00,640 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 24 [2022-03-20 18:46:00,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:00,640 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2022-03-20 18:46:00,640 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:00,640 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2022-03-20 18:46:00,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:46:00,641 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:00,641 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:00,657 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:00,855 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 18:46:00,855 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:00,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:00,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1437562487, now seen corresponding path program 9 times [2022-03-20 18:46:00,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:00,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [510046982] [2022-03-20 18:46:00,982 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:00,982 INFO L85 PathProgramCache]: Analyzing trace with hash -2095640458, now seen corresponding path program 1 times [2022-03-20 18:46:00,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:00,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671093031] [2022-03-20 18:46:00,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:00,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:00,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:01,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:01,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:01,067 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:46:01,067 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:01,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671093031] [2022-03-20 18:46:01,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671093031] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:01,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000754680] [2022-03-20 18:46:01,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:01,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:01,068 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:01,077 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:01,103 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:46:01,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:01,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:46:01,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:01,192 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:46:01,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:01,316 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 18:46:01,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000754680] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:01,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:01,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 14 [2022-03-20 18:46:01,322 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:01,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [510046982] [2022-03-20 18:46:01,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [510046982] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:01,322 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:01,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:46:01,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826602116] [2022-03-20 18:46:01,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:01,322 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:46:01,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:01,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:46:01,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:46:01,323 INFO L87 Difference]: Start difference. First operand 48 states and 58 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) [2022-03-20 18:46:01,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:01,575 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2022-03-20 18:46:01,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:46:01,575 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 25 [2022-03-20 18:46:01,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:01,576 INFO L225 Difference]: With dead ends: 72 [2022-03-20 18:46:01,576 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 18:46:01,576 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=337, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:46:01,576 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 45 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:01,577 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 35 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:01,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 18:46:01,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 55. [2022-03-20 18:46:01,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:01,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2022-03-20 18:46:01,592 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 25 [2022-03-20 18:46:01,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:01,592 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2022-03-20 18:46:01,592 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) [2022-03-20 18:46:01,592 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2022-03-20 18:46:01,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 18:46:01,593 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:01,593 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:01,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:01,794 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:01,794 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:01,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:01,794 INFO L85 PathProgramCache]: Analyzing trace with hash -77614719, now seen corresponding path program 10 times [2022-03-20 18:46:01,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:01,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [898690793] [2022-03-20 18:46:01,913 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:01,913 INFO L85 PathProgramCache]: Analyzing trace with hash -444348510, now seen corresponding path program 1 times [2022-03-20 18:46:01,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:01,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538800885] [2022-03-20 18:46:01,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:01,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:01,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:02,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:02,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:02,072 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:02,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:02,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538800885] [2022-03-20 18:46:02,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538800885] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:02,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633582092] [2022-03-20 18:46:02,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:02,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:02,073 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:02,082 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:02,084 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:46:02,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:02,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:46:02,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:02,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:02,425 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:02,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633582092] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:02,426 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:02,426 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-20 18:46:02,453 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:02,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [898690793] [2022-03-20 18:46:02,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [898690793] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:02,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:02,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:46:02,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970889736] [2022-03-20 18:46:02,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:02,454 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:46:02,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:02,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:46:02,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:46:02,454 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:04,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:04,278 INFO L93 Difference]: Finished difference Result 99 states and 123 transitions. [2022-03-20 18:46:04,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:46:04,278 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-20 18:46:04,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:04,279 INFO L225 Difference]: With dead ends: 99 [2022-03-20 18:46:04,279 INFO L226 Difference]: Without dead ends: 82 [2022-03-20 18:46:04,280 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=494, Invalid=2158, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 18:46:04,280 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 79 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:04,280 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 70 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:46:04,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-20 18:46:04,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 66. [2022-03-20 18:46:04,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 61 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:04,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 81 transitions. [2022-03-20 18:46:04,299 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 81 transitions. Word has length 26 [2022-03-20 18:46:04,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:04,299 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 81 transitions. [2022-03-20 18:46:04,299 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:04,300 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 81 transitions. [2022-03-20 18:46:04,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:46:04,300 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:04,300 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:04,317 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-20 18:46:04,504 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:04,505 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:04,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:04,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1833553784, now seen corresponding path program 11 times [2022-03-20 18:46:04,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:04,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [603477377] [2022-03-20 18:46:04,648 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:04,648 INFO L85 PathProgramCache]: Analyzing trace with hash -712346041, now seen corresponding path program 1 times [2022-03-20 18:46:04,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:04,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354938447] [2022-03-20 18:46:04,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:04,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:04,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:04,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:04,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:04,764 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:46:04,764 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:04,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354938447] [2022-03-20 18:46:04,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354938447] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:04,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121212359] [2022-03-20 18:46:04,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:04,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:04,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:04,768 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:04,769 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:46:04,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:04,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:46:04,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:04,845 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:46:04,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:04,979 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 18:46:04,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121212359] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:04,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:04,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2022-03-20 18:46:04,987 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:04,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [603477377] [2022-03-20 18:46:04,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [603477377] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:04,988 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:04,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:46:04,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429962656] [2022-03-20 18:46:04,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:04,988 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:46:04,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:04,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:46:04,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:46:04,989 INFO L87 Difference]: Start difference. First operand 66 states and 81 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:05,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:05,305 INFO L93 Difference]: Finished difference Result 93 states and 118 transitions. [2022-03-20 18:46:05,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:46:05,306 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:46:05,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:05,306 INFO L225 Difference]: With dead ends: 93 [2022-03-20 18:46:05,306 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 18:46:05,306 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2022-03-20 18:46:05,317 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:05,317 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 48 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:46:05,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 18:46:05,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 74. [2022-03-20 18:46:05,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.2608695652173914) internal successors, (87), 69 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:05,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2022-03-20 18:46:05,347 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 27 [2022-03-20 18:46:05,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:05,347 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2022-03-20 18:46:05,347 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:05,347 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2022-03-20 18:46:05,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:46:05,347 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:05,347 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:05,364 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:05,564 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:05,564 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:05,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:05,565 INFO L85 PathProgramCache]: Analyzing trace with hash -828351928, now seen corresponding path program 12 times [2022-03-20 18:46:05,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:05,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1049232549] [2022-03-20 18:46:05,670 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:05,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1968509543, now seen corresponding path program 1 times [2022-03-20 18:46:05,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:05,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622320269] [2022-03-20 18:46:05,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:05,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:05,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:06,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:06,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:07,001 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:07,001 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:07,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622320269] [2022-03-20 18:46:07,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622320269] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:07,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109825819] [2022-03-20 18:46:07,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:07,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:07,001 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:07,002 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:07,003 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:46:07,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:07,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-20 18:46:07,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:09,435 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:09,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:17,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109825819] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:17,088 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:17,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 49 [2022-03-20 18:46:17,960 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:17,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1049232549] [2022-03-20 18:46:17,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1049232549] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:17,960 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:17,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:46:17,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992272638] [2022-03-20 18:46:17,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:17,961 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:46:17,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:17,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:46:17,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=519, Invalid=2237, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:46:17,962 INFO L87 Difference]: Start difference. First operand 74 states and 91 transitions. Second operand has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:28,336 WARN L232 SmtUtils]: Spent 5.67s on a formula simplification. DAG size of input: 80 DAG size of output: 62 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 18:46:36,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:36,318 INFO L93 Difference]: Finished difference Result 85 states and 101 transitions. [2022-03-20 18:46:36,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:46:36,320 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:46:36,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:36,320 INFO L225 Difference]: With dead ends: 85 [2022-03-20 18:46:36,320 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 18:46:36,322 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1746 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=963, Invalid=4736, Unknown=1, NotChecked=0, Total=5700 [2022-03-20 18:46:36,322 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 28 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:36,322 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 93 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-03-20 18:46:36,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 18:46:36,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2022-03-20 18:46:36,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.2463768115942029) internal successors, (86), 69 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:36,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 90 transitions. [2022-03-20 18:46:36,367 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 90 transitions. Word has length 27 [2022-03-20 18:46:36,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:36,368 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 90 transitions. [2022-03-20 18:46:36,368 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:36,368 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 90 transitions. [2022-03-20 18:46:36,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:46:36,369 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:36,369 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:36,378 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-03-20 18:46:36,573 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 18:46:36,573 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:36,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:36,573 INFO L85 PathProgramCache]: Analyzing trace with hash -1924935406, now seen corresponding path program 13 times [2022-03-20 18:46:36,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:36,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1967637532] [2022-03-20 18:46:36,658 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:36,658 INFO L85 PathProgramCache]: Analyzing trace with hash -244120653, now seen corresponding path program 1 times [2022-03-20 18:46:36,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:36,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339857148] [2022-03-20 18:46:36,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:36,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:36,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:36,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:36,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:36,952 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:36,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:36,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339857148] [2022-03-20 18:46:36,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339857148] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:36,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502668754] [2022-03-20 18:46:36,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:36,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:36,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:36,954 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:36,955 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:46:36,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:36,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:46:36,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:37,139 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:37,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:37,476 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:37,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502668754] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:37,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:37,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-20 18:46:37,514 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:37,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1967637532] [2022-03-20 18:46:37,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1967637532] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:37,514 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:37,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:46:37,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678169925] [2022-03-20 18:46:37,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:37,515 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:46:37,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:37,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:46:37,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:46:37,515 INFO L87 Difference]: Start difference. First operand 74 states and 90 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:41,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:41,979 INFO L93 Difference]: Finished difference Result 129 states and 160 transitions. [2022-03-20 18:46:41,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 18:46:41,979 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 18:46:41,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:41,980 INFO L225 Difference]: With dead ends: 129 [2022-03-20 18:46:41,980 INFO L226 Difference]: Without dead ends: 110 [2022-03-20 18:46:41,981 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=806, Invalid=3886, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:46:41,981 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 120 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:41,982 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 81 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:46:41,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-20 18:46:42,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 87. [2022-03-20 18:46:42,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.2560975609756098) internal successors, (103), 82 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:42,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 107 transitions. [2022-03-20 18:46:42,021 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 107 transitions. Word has length 28 [2022-03-20 18:46:42,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:42,021 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 107 transitions. [2022-03-20 18:46:42,021 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:42,021 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 107 transitions. [2022-03-20 18:46:42,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:46:42,021 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:42,021 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:42,040 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:42,227 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:42,227 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:42,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:42,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1029047063, now seen corresponding path program 14 times [2022-03-20 18:46:42,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:42,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1655653106] [2022-03-20 18:46:42,344 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:42,345 INFO L85 PathProgramCache]: Analyzing trace with hash 8113238, now seen corresponding path program 1 times [2022-03-20 18:46:42,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:42,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509266322] [2022-03-20 18:46:42,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:42,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:42,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:42,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:42,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:42,532 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:46:42,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:42,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509266322] [2022-03-20 18:46:42,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509266322] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:42,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109940144] [2022-03-20 18:46:42,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:42,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:42,532 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:42,540 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:42,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:46:42,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:42,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:46:42,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:42,657 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:46:42,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:42,902 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 18:46:42,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109940144] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:42,902 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:42,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 18 [2022-03-20 18:46:42,907 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:42,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1655653106] [2022-03-20 18:46:42,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1655653106] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:42,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:42,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:46:42,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324271817] [2022-03-20 18:46:42,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:42,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:46:42,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:42,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:46:42,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:46:42,908 INFO L87 Difference]: Start difference. First operand 87 states and 107 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:43,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:43,389 INFO L93 Difference]: Finished difference Result 117 states and 148 transitions. [2022-03-20 18:46:43,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:46:43,390 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 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 29 [2022-03-20 18:46:43,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:43,390 INFO L225 Difference]: With dead ends: 117 [2022-03-20 18:46:43,390 INFO L226 Difference]: Without dead ends: 111 [2022-03-20 18:46:43,391 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=191, Invalid=565, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:46:43,391 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 58 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:43,391 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 61 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:46:43,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-20 18:46:43,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 96. [2022-03-20 18:46:43,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.2527472527472527) internal successors, (114), 91 states have internal predecessors, (114), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:43,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 118 transitions. [2022-03-20 18:46:43,430 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 118 transitions. Word has length 29 [2022-03-20 18:46:43,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:43,430 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 118 transitions. [2022-03-20 18:46:43,430 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:43,430 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 118 transitions. [2022-03-20 18:46:43,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:46:43,430 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:43,431 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:43,448 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-20 18:46:43,644 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:43,645 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:43,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:43,645 INFO L85 PathProgramCache]: Analyzing trace with hash -889345759, now seen corresponding path program 15 times [2022-03-20 18:46:43,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:43,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1304169763] [2022-03-20 18:46:43,774 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:43,774 INFO L85 PathProgramCache]: Analyzing trace with hash -118007806, now seen corresponding path program 1 times [2022-03-20 18:46:43,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:43,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864858693] [2022-03-20 18:46:43,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:43,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:43,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:44,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:44,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:44,095 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:44,095 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:44,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864858693] [2022-03-20 18:46:44,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864858693] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:44,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596219390] [2022-03-20 18:46:44,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:44,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:44,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:44,096 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:44,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 18:46:44,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:44,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:46:44,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:44,264 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:44,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:44,701 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:46:44,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596219390] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:44,702 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:44,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 24 [2022-03-20 18:46:44,747 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:44,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1304169763] [2022-03-20 18:46:44,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1304169763] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:44,748 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:44,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:46:44,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734702574] [2022-03-20 18:46:44,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:44,748 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:46:44,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:44,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:46:44,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=539, Unknown=0, NotChecked=0, Total=600 [2022-03-20 18:46:44,751 INFO L87 Difference]: Start difference. First operand 96 states and 118 transitions. Second operand has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:54,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:54,372 INFO L93 Difference]: Finished difference Result 163 states and 203 transitions. [2022-03-20 18:46:54,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-03-20 18:46:54,372 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-20 18:46:54,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:54,373 INFO L225 Difference]: With dead ends: 163 [2022-03-20 18:46:54,373 INFO L226 Difference]: Without dead ends: 142 [2022-03-20 18:46:54,374 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1950 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1233, Invalid=6249, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 18:46:54,375 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 171 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:54,375 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 90 Invalid, 777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-20 18:46:54,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-20 18:46:54,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 111. [2022-03-20 18:46:54,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.2641509433962264) internal successors, (134), 106 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:54,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 138 transitions. [2022-03-20 18:46:54,418 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 138 transitions. Word has length 30 [2022-03-20 18:46:54,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:54,418 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 138 transitions. [2022-03-20 18:46:54,418 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:54,418 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 138 transitions. [2022-03-20 18:46:54,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:46:54,419 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:54,419 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:54,435 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-03-20 18:46:54,624 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:54,624 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:54,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:54,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1227412248, now seen corresponding path program 16 times [2022-03-20 18:46:54,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:54,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1454036913] [2022-03-20 18:46:54,775 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:54,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1215762919, now seen corresponding path program 1 times [2022-03-20 18:46:54,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:54,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803844201] [2022-03-20 18:46:54,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:54,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:54,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:55,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:55,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:55,056 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 18:46:55,057 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:55,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803844201] [2022-03-20 18:46:55,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803844201] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:55,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996099480] [2022-03-20 18:46:55,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:55,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:55,057 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:55,076 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:55,077 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 18:46:55,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:55,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:46:55,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:55,851 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:55,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:56,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996099480] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:56,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:56,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21, 19] total 46 [2022-03-20 18:46:56,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:56,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1454036913] [2022-03-20 18:46:56,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1454036913] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:56,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:56,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:46:56,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518542282] [2022-03-20 18:46:56,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:56,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:46:56,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:56,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:46:56,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1580, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 18:46:56,732 INFO L87 Difference]: Start difference. First operand 111 states and 138 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:57,498 INFO L93 Difference]: Finished difference Result 144 states and 183 transitions. [2022-03-20 18:46:57,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:46:57,498 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 31 [2022-03-20 18:46:57,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:57,499 INFO L225 Difference]: With dead ends: 144 [2022-03-20 18:46:57,499 INFO L226 Difference]: Without dead ends: 138 [2022-03-20 18:46:57,500 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=800, Invalid=2506, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:46:57,500 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 63 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:57,500 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 69 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:46:57,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-03-20 18:46:57,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 121. [2022-03-20 18:46:57,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.2586206896551724) internal successors, (146), 116 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 150 transitions. [2022-03-20 18:46:57,553 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 150 transitions. Word has length 31 [2022-03-20 18:46:57,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:57,553 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 150 transitions. [2022-03-20 18:46:57,553 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:57,553 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 150 transitions. [2022-03-20 18:46:57,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:46:57,554 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:57,554 INFO L499 BasicCegarLoop]: trace histogram [7, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:57,572 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:57,771 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 18:46:57,772 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:57,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:57,772 INFO L85 PathProgramCache]: Analyzing trace with hash -792225656, now seen corresponding path program 17 times [2022-03-20 18:46:57,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:57,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1389217486] [2022-03-20 18:46:57,899 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:46:57,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1195274215, now seen corresponding path program 1 times [2022-03-20 18:46:57,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:57,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702936225] [2022-03-20 18:46:57,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:57,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:57,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:58,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,062 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:46:58,062 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:58,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702936225] [2022-03-20 18:46:58,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702936225] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:58,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270764036] [2022-03-20 18:46:58,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:58,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:58,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:58,064 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:46:58,065 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 18:46:58,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:58,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 18:46:58,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:58,220 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:46:58,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:58,482 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:46:58,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270764036] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:58,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:58,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-20 18:46:58,609 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:58,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1389217486] [2022-03-20 18:46:58,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1389217486] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:58,609 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:58,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:46:58,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867270806] [2022-03-20 18:46:58,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:58,610 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:46:58,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:58,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:46:58,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:46:58,610 INFO L87 Difference]: Start difference. First operand 121 states and 150 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) [2022-03-20 18:46:59,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:59,675 INFO L93 Difference]: Finished difference Result 186 states and 225 transitions. [2022-03-20 18:46:59,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:46:59,675 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 31 [2022-03-20 18:46:59,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:59,676 INFO L225 Difference]: With dead ends: 186 [2022-03-20 18:46:59,676 INFO L226 Difference]: Without dead ends: 123 [2022-03-20 18:46:59,677 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=218, Invalid=1188, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:46:59,677 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 48 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:59,677 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 62 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:46:59,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-03-20 18:46:59,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 108. [2022-03-20 18:46:59,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.2233009708737863) internal successors, (126), 103 states have internal predecessors, (126), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:46:59,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 130 transitions. [2022-03-20 18:46:59,721 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 130 transitions. Word has length 31 [2022-03-20 18:46:59,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:59,721 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 130 transitions. [2022-03-20 18:46:59,721 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) [2022-03-20 18:46:59,721 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 130 transitions. [2022-03-20 18:46:59,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:46:59,721 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:59,721 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:59,738 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 18:46:59,938 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 18:46:59,938 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:59,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:59,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1818120792, now seen corresponding path program 18 times [2022-03-20 18:46:59,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:59,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [786599394] [2022-03-20 18:47:00,019 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:00,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1792663938, now seen corresponding path program 1 times [2022-03-20 18:47:00,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:00,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312505855] [2022-03-20 18:47:00,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:00,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:02,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:02,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:02,171 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:02,171 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:02,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312505855] [2022-03-20 18:47:02,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312505855] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:02,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563488760] [2022-03-20 18:47:02,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:02,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:02,172 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:02,178 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:02,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 18:47:02,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:02,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 18:47:02,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:05,489 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:05,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:17,161 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:47:17,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563488760] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:17,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:17,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 21] total 57 [2022-03-20 18:47:18,601 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:18,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [786599394] [2022-03-20 18:47:18,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [786599394] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:18,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:18,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:47:18,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979799672] [2022-03-20 18:47:18,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:18,602 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:47:18,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:18,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:47:18,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=596, Invalid=3186, Unknown=0, NotChecked=0, Total=3782 [2022-03-20 18:47:18,604 INFO L87 Difference]: Start difference. First operand 108 states and 130 transitions. Second operand has 25 states, 25 states have (on average 1.08) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:23,422 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:47:31,909 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 [] [2022-03-20 18:47:39,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:47:39,332 INFO L93 Difference]: Finished difference Result 118 states and 139 transitions. [2022-03-20 18:47:39,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:47:39,332 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.08) internal successors, (27), 23 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 [2022-03-20 18:47:39,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:47:39,333 INFO L225 Difference]: With dead ends: 118 [2022-03-20 18:47:39,333 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 18:47:39,335 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2357 ImplicationChecksByTransitivity, 30.3s TimeCoverageRelationStatistics Valid=1058, Invalid=6598, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 18:47:39,335 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 29 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 40 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:47:39,335 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 102 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 541 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2022-03-20 18:47:39,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 18:47:39,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2022-03-20 18:47:39,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.2135922330097086) internal successors, (125), 103 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:39,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 129 transitions. [2022-03-20 18:47:39,379 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 129 transitions. Word has length 31 [2022-03-20 18:47:39,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:47:39,379 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 129 transitions. [2022-03-20 18:47:39,379 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.08) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:47:39,379 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 129 transitions. [2022-03-20 18:47:39,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:47:39,379 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:47:39,380 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:47:39,396 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 18:47:39,596 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 18:47:39,596 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:47:39,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:47:39,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1475115858, now seen corresponding path program 19 times [2022-03-20 18:47:39,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:39,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [216092317] [2022-03-20 18:47:39,710 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:47:39,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1069806611, now seen corresponding path program 1 times [2022-03-20 18:47:39,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:47:39,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107092667] [2022-03-20 18:47:39,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:39,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:47:39,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:40,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:47:40,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:40,290 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:40,290 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:47:40,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107092667] [2022-03-20 18:47:40,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107092667] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:47:40,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633228571] [2022-03-20 18:47:40,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:47:40,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:47:40,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:47:40,292 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:47:40,292 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 18:47:40,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:47:40,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 18:47:40,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:47:40,501 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:40,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:47:41,136 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:47:41,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633228571] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:47:41,136 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:47:41,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 27 [2022-03-20 18:47:41,395 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:47:41,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [216092317] [2022-03-20 18:47:41,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [216092317] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:47:41,395 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:47:41,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:47:41,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994097342] [2022-03-20 18:47:41,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:47:41,396 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:47:41,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:47:41,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:47:41,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=794, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:47:41,397 INFO L87 Difference]: Start difference. First operand 108 states and 129 transitions. Second operand has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:02,288 INFO L93 Difference]: Finished difference Result 179 states and 219 transitions. [2022-03-20 18:48:02,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-03-20 18:48:02,289 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 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 [2022-03-20 18:48:02,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:02,289 INFO L225 Difference]: With dead ends: 179 [2022-03-20 18:48:02,289 INFO L226 Difference]: Without dead ends: 156 [2022-03-20 18:48:02,290 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2664 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=1563, Invalid=8537, Unknown=0, NotChecked=0, Total=10100 [2022-03-20 18:48:02,290 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 191 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 1059 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:02,290 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 105 Invalid, 1059 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [372 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-20 18:48:02,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-03-20 18:48:02,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2022-03-20 18:48:02,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.226890756302521) internal successors, (146), 119 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 150 transitions. [2022-03-20 18:48:02,343 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 150 transitions. Word has length 34 [2022-03-20 18:48:02,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:02,343 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 150 transitions. [2022-03-20 18:48:02,343 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:02,343 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 150 transitions. [2022-03-20 18:48:02,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:48:02,343 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:02,343 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:02,360 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:02,559 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:02,560 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:02,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:02,560 INFO L85 PathProgramCache]: Analyzing trace with hash -943546153, now seen corresponding path program 20 times [2022-03-20 18:48:02,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:02,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1143324891] [2022-03-20 18:48:02,668 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:02,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1362036726, now seen corresponding path program 1 times [2022-03-20 18:48:02,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:02,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124141703] [2022-03-20 18:48:02,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:02,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:02,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:03,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:03,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:03,112 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:48:03,113 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:03,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124141703] [2022-03-20 18:48:03,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124141703] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:03,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543118808] [2022-03-20 18:48:03,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:03,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:03,113 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:03,114 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:03,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 18:48:03,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:03,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 18:48:03,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:48:03,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:03,782 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-20 18:48:03,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543118808] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:03,783 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:03,783 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 22 [2022-03-20 18:48:04,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:04,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1143324891] [2022-03-20 18:48:04,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1143324891] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:04,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:04,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:48:04,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792851353] [2022-03-20 18:48:04,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:04,021 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:48:04,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:04,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:48:04,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:48:04,022 INFO L87 Difference]: Start difference. First operand 124 states and 150 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:05,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:05,459 INFO L93 Difference]: Finished difference Result 184 states and 231 transitions. [2022-03-20 18:48:05,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:48:05,459 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 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 35 [2022-03-20 18:48:05,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:05,460 INFO L225 Difference]: With dead ends: 184 [2022-03-20 18:48:05,460 INFO L226 Difference]: Without dead ends: 178 [2022-03-20 18:48:05,461 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=388, Invalid=1172, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:48:05,461 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 89 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:05,461 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 64 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:48:05,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-03-20 18:48:05,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 137. [2022-03-20 18:48:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.2348484848484849) internal successors, (163), 132 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:05,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 167 transitions. [2022-03-20 18:48:05,532 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 167 transitions. Word has length 35 [2022-03-20 18:48:05,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:05,532 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 167 transitions. [2022-03-20 18:48:05,532 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 15 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:05,532 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 167 transitions. [2022-03-20 18:48:05,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:48:05,533 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:05,533 INFO L499 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:05,551 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:05,749 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:05,750 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:05,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:05,750 INFO L85 PathProgramCache]: Analyzing trace with hash 900073496, now seen corresponding path program 21 times [2022-03-20 18:48:05,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:05,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [517428265] [2022-03-20 18:48:05,866 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:05,867 INFO L85 PathProgramCache]: Analyzing trace with hash -2075413758, now seen corresponding path program 1 times [2022-03-20 18:48:05,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:05,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278902759] [2022-03-20 18:48:05,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:05,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:05,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:06,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:06,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:06,136 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 18:48:06,136 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:06,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278902759] [2022-03-20 18:48:06,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278902759] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:06,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403641509] [2022-03-20 18:48:06,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:06,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:06,136 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:06,137 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:06,138 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 18:48:06,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:06,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:48:06,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:06,329 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 18:48:06,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 18:48:06,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403641509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:06,728 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:06,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-20 18:48:07,024 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:07,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [517428265] [2022-03-20 18:48:07,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [517428265] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:07,024 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:07,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:48:07,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007499945] [2022-03-20 18:48:07,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:07,024 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:48:07,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:07,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:48:07,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:48:07,025 INFO L87 Difference]: Start difference. First operand 137 states and 167 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:08,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:48:08,952 INFO L93 Difference]: Finished difference Result 209 states and 252 transitions. [2022-03-20 18:48:08,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 18:48:08,952 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 18:48:08,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:48:08,956 INFO L225 Difference]: With dead ends: 209 [2022-03-20 18:48:08,956 INFO L226 Difference]: Without dead ends: 142 [2022-03-20 18:48:08,957 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=261, Invalid=1719, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:48:08,957 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:48:08,959 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 83 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:48:08,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-20 18:48:09,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 122. [2022-03-20 18:48:09,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.2136752136752136) internal successors, (142), 117 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:09,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 146 transitions. [2022-03-20 18:48:09,021 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 146 transitions. Word has length 35 [2022-03-20 18:48:09,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:48:09,022 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 146 transitions. [2022-03-20 18:48:09,022 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:48:09,022 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 146 transitions. [2022-03-20 18:48:09,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:48:09,022 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:48:09,022 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:48:09,041 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 18:48:09,239 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-03-20 18:48:09,239 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:48:09,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:48:09,239 INFO L85 PathProgramCache]: Analyzing trace with hash 144704712, now seen corresponding path program 22 times [2022-03-20 18:48:09,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:09,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [252027613] [2022-03-20 18:48:09,348 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:48:09,348 INFO L85 PathProgramCache]: Analyzing trace with hash -980435449, now seen corresponding path program 1 times [2022-03-20 18:48:09,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:48:09,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987620043] [2022-03-20 18:48:09,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:09,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:48:09,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:48:18,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,142 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:18,143 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:48:18,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987620043] [2022-03-20 18:48:18,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987620043] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:48:18,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666809050] [2022-03-20 18:48:18,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:48:18,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:48:18,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:48:18,157 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:48:18,158 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 18:48:18,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:48:18,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 18:48:18,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:48:22,792 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:22,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:48:41,357 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:48:41,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666809050] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:48:41,357 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:48:41,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 65 [2022-03-20 18:48:52,149 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:48:52,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [252027613] [2022-03-20 18:48:52,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [252027613] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:48:52,150 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:48:52,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:48:52,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326392771] [2022-03-20 18:48:52,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:48:52,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:48:52,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:48:52,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:48:52,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=623, Invalid=4344, Unknown=3, NotChecked=0, Total=4970 [2022-03-20 18:48:52,151 INFO L87 Difference]: Start difference. First operand 122 states and 146 transitions. Second operand has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:12,032 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 [] [2022-03-20 18:49:14,749 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:49:26,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:49:48,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:48,873 INFO L93 Difference]: Finished difference Result 133 states and 156 transitions. [2022-03-20 18:49:48,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:49:48,874 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 18:49:48,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:48,874 INFO L225 Difference]: With dead ends: 133 [2022-03-20 18:49:48,874 INFO L226 Difference]: Without dead ends: 122 [2022-03-20 18:49:48,875 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2695 ImplicationChecksByTransitivity, 86.7s TimeCoverageRelationStatistics Valid=1127, Invalid=8964, Unknown=9, NotChecked=0, Total=10100 [2022-03-20 18:49:48,875 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 42 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:48,876 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 82 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 531 Invalid, 3 Unknown, 0 Unchecked, 10.3s Time] [2022-03-20 18:49:48,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-03-20 18:49:48,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-03-20 18:49:48,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.205128205128205) internal successors, (141), 117 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:48,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 145 transitions. [2022-03-20 18:49:48,936 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 145 transitions. Word has length 35 [2022-03-20 18:49:48,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:48,936 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 145 transitions. [2022-03-20 18:49:48,936 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:49:48,936 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 145 transitions. [2022-03-20 18:49:48,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:49:48,936 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:48,936 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:48,954 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 18:49:49,139 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-03-20 18:49:49,139 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:49,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:49,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1008384056, now seen corresponding path program 23 times [2022-03-20 18:49:49,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:49,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [785511754] [2022-03-20 18:49:49,245 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:49:49,245 INFO L85 PathProgramCache]: Analyzing trace with hash 545894690, now seen corresponding path program 1 times [2022-03-20 18:49:49,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:49,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044291220] [2022-03-20 18:49:49,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:49,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:49,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:50,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:50,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:50,008 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:49:50,008 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:50,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044291220] [2022-03-20 18:49:50,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044291220] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:50,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752394604] [2022-03-20 18:49:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:50,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:50,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:50,010 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:49:50,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 18:49:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:50,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:49:50,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:50,353 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:49:50,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:51,377 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:49:51,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752394604] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:51,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:51,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2022-03-20 18:49:51,981 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:51,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [785511754] [2022-03-20 18:49:51,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [785511754] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:51,981 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:51,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:49:51,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148562808] [2022-03-20 18:49:51,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:51,981 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:49:51,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:51,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:49:51,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:49:51,982 INFO L87 Difference]: Start difference. First operand 122 states and 145 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:33,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:33,064 INFO L93 Difference]: Finished difference Result 201 states and 244 transitions. [2022-03-20 18:50:33,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-03-20 18:50:33,065 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:50:33,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:33,065 INFO L225 Difference]: With dead ends: 201 [2022-03-20 18:50:33,065 INFO L226 Difference]: Without dead ends: 176 [2022-03-20 18:50:33,067 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 66 SyntacticMatches, 7 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3770 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=2063, Invalid=11743, Unknown=0, NotChecked=0, Total=13806 [2022-03-20 18:50:33,067 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 197 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 852 mSolverCounterSat, 467 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 467 IncrementalHoareTripleChecker+Valid, 852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:33,067 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 115 Invalid, 1319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [467 Valid, 852 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-03-20 18:50:33,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-03-20 18:50:33,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 139. [2022-03-20 18:50:33,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.2164179104477613) internal successors, (163), 134 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:33,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 167 transitions. [2022-03-20 18:50:33,150 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 167 transitions. Word has length 37 [2022-03-20 18:50:33,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:33,150 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 167 transitions. [2022-03-20 18:50:33,150 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:33,150 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 167 transitions. [2022-03-20 18:50:33,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 18:50:33,150 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:33,150 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:33,166 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-03-20 18:50:33,366 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:33,366 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:33,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:33,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1767637169, now seen corresponding path program 24 times [2022-03-20 18:50:33,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:33,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [600428319] [2022-03-20 18:50:33,493 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:33,493 INFO L85 PathProgramCache]: Analyzing trace with hash 1192099015, now seen corresponding path program 1 times [2022-03-20 18:50:33,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:33,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792182137] [2022-03-20 18:50:33,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:33,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:33,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:34,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:34,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:34,453 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-03-20 18:50:34,453 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:34,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792182137] [2022-03-20 18:50:34,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792182137] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:34,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092278780] [2022-03-20 18:50:34,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:34,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:34,454 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:34,455 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:50:34,456 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 18:50:34,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:34,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:50:34,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:34,620 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-03-20 18:50:34,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-03-20 18:50:35,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092278780] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:35,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:35,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12] total 24 [2022-03-20 18:50:36,057 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:36,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [600428319] [2022-03-20 18:50:36,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [600428319] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:36,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:36,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:50:36,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57034728] [2022-03-20 18:50:36,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:36,058 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:50:36,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:36,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:50:36,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=507, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:50:36,059 INFO L87 Difference]: Start difference. First operand 139 states and 167 transitions. Second operand has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:39,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:39,126 INFO L93 Difference]: Finished difference Result 215 states and 265 transitions. [2022-03-20 18:50:39,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:50:39,127 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-20 18:50:39,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:39,128 INFO L225 Difference]: With dead ends: 215 [2022-03-20 18:50:39,128 INFO L226 Difference]: Without dead ends: 209 [2022-03-20 18:50:39,128 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=515, Invalid=1555, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:50:39,128 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 120 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:39,129 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 49 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:50:39,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-03-20 18:50:39,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 152. [2022-03-20 18:50:39,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.217687074829932) internal successors, (179), 147 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:39,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 183 transitions. [2022-03-20 18:50:39,214 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 183 transitions. Word has length 38 [2022-03-20 18:50:39,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:39,214 INFO L478 AbstractCegarLoop]: Abstraction has 152 states and 183 transitions. [2022-03-20 18:50:39,214 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:50:39,214 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 183 transitions. [2022-03-20 18:50:39,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:50:39,215 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:39,215 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:39,231 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 18:50:39,427 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:39,427 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:39,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:39,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1422345609, now seen corresponding path program 25 times [2022-03-20 18:50:39,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:39,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [821706059] [2022-03-20 18:50:39,559 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:50:39,559 INFO L85 PathProgramCache]: Analyzing trace with hash -2125599629, now seen corresponding path program 1 times [2022-03-20 18:50:39,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:39,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279034660] [2022-03-20 18:50:39,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:39,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:39,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:40,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:40,932 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279034660] [2022-03-20 18:50:40,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279034660] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662039416] [2022-03-20 18:50:40,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:40,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:40,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:40,933 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:50:40,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 18:50:40,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:40,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 18:50:40,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:41,249 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:41,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:42,659 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:50:42,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662039416] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:42,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:42,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-20 18:50:43,631 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:43,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [821706059] [2022-03-20 18:50:43,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [821706059] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:43,631 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:43,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:50:43,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987867582] [2022-03-20 18:50:43,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:43,631 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:50:43,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:43,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:50:43,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1235, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:50:43,647 INFO L87 Difference]: Start difference. First operand 152 states and 183 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:52:20,450 INFO L93 Difference]: Finished difference Result 246 states and 300 transitions. [2022-03-20 18:52:20,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-03-20 18:52:20,452 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 18:52:20,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:52:20,452 INFO L225 Difference]: With dead ends: 246 [2022-03-20 18:52:20,453 INFO L226 Difference]: Without dead ends: 219 [2022-03-20 18:52:20,453 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 72 SyntacticMatches, 6 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5806 ImplicationChecksByTransitivity, 91.3s TimeCoverageRelationStatistics Valid=2886, Invalid=16854, Unknown=0, NotChecked=0, Total=19740 [2022-03-20 18:52:20,454 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 270 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1182 mSolverCounterSat, 600 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 1782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 600 IncrementalHoareTripleChecker+Valid, 1182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:52:20,454 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [270 Valid, 136 Invalid, 1782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [600 Valid, 1182 Invalid, 0 Unknown, 0 Unchecked, 8.9s Time] [2022-03-20 18:52:20,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-03-20 18:52:20,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 171. [2022-03-20 18:52:20,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2289156626506024) internal successors, (204), 166 states have internal predecessors, (204), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 208 transitions. [2022-03-20 18:52:20,554 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 208 transitions. Word has length 39 [2022-03-20 18:52:20,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:52:20,554 INFO L478 AbstractCegarLoop]: Abstraction has 171 states and 208 transitions. [2022-03-20 18:52:20,554 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:52:20,554 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 208 transitions. [2022-03-20 18:52:20,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:52:20,555 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:52:20,555 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:52:20,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 18:52:20,767 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:20,767 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:52:20,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:52:20,768 INFO L85 PathProgramCache]: Analyzing trace with hash -1036634024, now seen corresponding path program 26 times [2022-03-20 18:52:20,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:52:20,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [555969438] [2022-03-20 18:52:20,883 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:52:20,883 INFO L85 PathProgramCache]: Analyzing trace with hash 987887842, now seen corresponding path program 1 times [2022-03-20 18:52:20,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:52:20,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290338958] [2022-03-20 18:52:20,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:20,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:52:20,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:41,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:52:41,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:41,741 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:41,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:52:41,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290338958] [2022-03-20 18:52:41,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290338958] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:52:41,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384905012] [2022-03-20 18:52:41,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:52:41,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:52:41,742 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:52:41,743 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:52:41,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 18:52:42,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:52:42,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 18:52:42,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:52:50,218 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:52:50,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:53:11,822 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:53:11,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384905012] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:53:11,823 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:53:11,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 21, 21] total 62 [2022-03-20 18:53:21,382 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:53:21,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [555969438] [2022-03-20 18:53:21,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [555969438] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:53:21,382 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:53:21,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 18:53:21,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605236488] [2022-03-20 18:53:21,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:53:21,383 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 18:53:21,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:53:21,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 18:53:21,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=4239, Unknown=2, NotChecked=0, Total=4692 [2022-03-20 18:53:21,384 INFO L87 Difference]: Start difference. First operand 171 states and 208 transitions. Second operand has 33 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:53:41,501 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:53:43,844 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:53:50,204 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:53:51,854 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.60s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:53:54,018 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:53:59,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:54:01,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.82s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:54:11,235 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:54:20,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:20,187 INFO L93 Difference]: Finished difference Result 183 states and 219 transitions. [2022-03-20 18:54:20,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:54:20,188 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 18:54:20,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:20,188 INFO L225 Difference]: With dead ends: 183 [2022-03-20 18:54:20,189 INFO L226 Difference]: Without dead ends: 171 [2022-03-20 18:54:20,189 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2754 ImplicationChecksByTransitivity, 78.6s TimeCoverageRelationStatistics Valid=981, Invalid=9726, Unknown=5, NotChecked=0, Total=10712 [2022-03-20 18:54:20,189 INFO L913 BasicCegarLoop]: 10 mSDtfsCounter, 33 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1009 mSolverCounterSat, 32 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 1044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1009 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:20,190 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 127 Invalid, 1044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1009 Invalid, 3 Unknown, 0 Unchecked, 27.8s Time] [2022-03-20 18:54:20,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-03-20 18:54:20,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2022-03-20 18:54:20,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.2228915662650603) internal successors, (203), 166 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) [2022-03-20 18:54:20,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 207 transitions. [2022-03-20 18:54:20,360 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 207 transitions. Word has length 39 [2022-03-20 18:54:20,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:20,360 INFO L478 AbstractCegarLoop]: Abstraction has 171 states and 207 transitions. [2022-03-20 18:54:20,360 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:20,360 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 207 transitions. [2022-03-20 18:54:20,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:54:20,361 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:20,361 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:20,365 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-20 18:54:20,564 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-20 18:54:20,565 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:20,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:20,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1715543424, now seen corresponding path program 27 times [2022-03-20 18:54:20,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:20,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [134868639] [2022-03-20 18:54:20,706 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:20,706 INFO L85 PathProgramCache]: Analyzing trace with hash 551887702, now seen corresponding path program 1 times [2022-03-20 18:54:20,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:20,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216776169] [2022-03-20 18:54:20,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:20,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:20,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:23,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:23,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:23,531 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-20 18:54:23,531 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:23,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216776169] [2022-03-20 18:54:23,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216776169] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:23,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644521050] [2022-03-20 18:54:23,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:23,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:23,532 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:23,533 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:54:23,534 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 18:54:23,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:23,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 51 conjunts are in the unsatisfiable core [2022-03-20 18:54:23,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:26,511 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-20 18:54:26,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:54:28,947 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-20 18:54:28,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644521050] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:54:28,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:54:28,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18, 16] total 43 [2022-03-20 18:54:31,104 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:54:31,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [134868639] [2022-03-20 18:54:31,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [134868639] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:54:31,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:54:31,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:54:31,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294552930] [2022-03-20 18:54:31,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:54:31,104 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:54:31,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:31,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:54:31,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=536, Invalid=1626, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 18:54:31,105 INFO L87 Difference]: Start difference. First operand 171 states and 207 transitions. Second operand has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:38,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:38,308 INFO L93 Difference]: Finished difference Result 252 states and 309 transitions. [2022-03-20 18:54:38,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:54:38,309 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 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 40 [2022-03-20 18:54:38,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:38,310 INFO L225 Difference]: With dead ends: 252 [2022-03-20 18:54:38,310 INFO L226 Difference]: Without dead ends: 246 [2022-03-20 18:54:38,310 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=948, Invalid=3474, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 18:54:38,310 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 133 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:38,311 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 47 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-20 18:54:38,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-03-20 18:54:38,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 184. [2022-03-20 18:54:38,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.217877094972067) internal successors, (218), 179 states have internal predecessors, (218), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:38,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 222 transitions. [2022-03-20 18:54:38,468 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 222 transitions. Word has length 40 [2022-03-20 18:54:38,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:38,469 INFO L478 AbstractCegarLoop]: Abstraction has 184 states and 222 transitions. [2022-03-20 18:54:38,469 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:38,469 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 222 transitions. [2022-03-20 18:54:38,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:54:38,469 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:38,469 INFO L499 BasicCegarLoop]: trace histogram [10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:38,486 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 18:54:38,686 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-20 18:54:38,687 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:38,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:38,687 INFO L85 PathProgramCache]: Analyzing trace with hash 373620577, now seen corresponding path program 28 times [2022-03-20 18:54:38,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:38,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1860293153] [2022-03-20 18:54:38,824 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:38,824 INFO L85 PathProgramCache]: Analyzing trace with hash 714667778, now seen corresponding path program 1 times [2022-03-20 18:54:38,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:38,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734249492] [2022-03-20 18:54:38,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:38,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:38,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:40,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:40,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:40,122 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 18:54:40,122 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:40,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734249492] [2022-03-20 18:54:40,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734249492] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:40,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374318302] [2022-03-20 18:54:40,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:40,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:40,123 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:40,124 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:54:40,125 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 18:54:40,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:40,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:54:40,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:40,470 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 18:54:40,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:54:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-03-20 18:54:41,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374318302] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:54:41,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:54:41,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-20 18:54:43,868 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:54:43,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1860293153] [2022-03-20 18:54:43,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1860293153] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:54:43,868 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:54:43,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:54:43,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453512432] [2022-03-20 18:54:43,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:54:43,869 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:54:43,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:43,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:54:43,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:54:43,869 INFO L87 Difference]: Start difference. First operand 184 states and 222 transitions. Second operand has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:53,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:54:53,722 INFO L93 Difference]: Finished difference Result 276 states and 329 transitions. [2022-03-20 18:54:53,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 18:54:53,725 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-20 18:54:53,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:54:53,726 INFO L225 Difference]: With dead ends: 276 [2022-03-20 18:54:53,726 INFO L226 Difference]: Without dead ends: 196 [2022-03-20 18:54:53,726 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=339, Invalid=2523, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:54:53,726 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 46 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:54:53,726 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 83 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:54:53,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-03-20 18:54:53,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 166. [2022-03-20 18:54:53,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.1987577639751552) internal successors, (193), 161 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:53,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 197 transitions. [2022-03-20 18:54:53,833 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 197 transitions. Word has length 40 [2022-03-20 18:54:53,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:54:53,833 INFO L478 AbstractCegarLoop]: Abstraction has 166 states and 197 transitions. [2022-03-20 18:54:53,833 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:54:53,833 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 197 transitions. [2022-03-20 18:54:53,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:54:53,833 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:54:53,833 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:54:53,850 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-20 18:54:54,039 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-20 18:54:54,040 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:54:54,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:54:54,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1463239135, now seen corresponding path program 29 times [2022-03-20 18:54:54,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:54:54,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1759655353] [2022-03-20 18:54:54,182 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:54:54,183 INFO L85 PathProgramCache]: Analyzing trace with hash 841966018, now seen corresponding path program 1 times [2022-03-20 18:54:54,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:54:54,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167844590] [2022-03-20 18:54:54,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:54,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:54:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:58,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:54:58,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:58,104 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:54:58,104 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:54:58,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167844590] [2022-03-20 18:54:58,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167844590] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:54:58,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813553053] [2022-03-20 18:54:58,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:54:58,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:54:58,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:54:58,105 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:54:58,106 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 18:54:58,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:54:58,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 18:54:58,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:54:59,165 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:54:59,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:55:02,791 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-20 18:55:02,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813553053] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:55:02,791 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:55:02,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2022-03-20 18:55:06,523 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:55:06,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1759655353] [2022-03-20 18:55:06,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1759655353] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:55:06,523 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:55:06,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:55:06,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096580094] [2022-03-20 18:55:06,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:55:06,524 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:55:06,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:55:06,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:55:06,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1597, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:55:06,524 INFO L87 Difference]: Start difference. First operand 166 states and 197 transitions. Second operand has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:57:54,431 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 18:58:05,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:58:05,774 INFO L93 Difference]: Finished difference Result 269 states and 324 transitions. [2022-03-20 18:58:05,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2022-03-20 18:58:05,776 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 18:58:05,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:58:05,777 INFO L225 Difference]: With dead ends: 269 [2022-03-20 18:58:05,777 INFO L226 Difference]: Without dead ends: 240 [2022-03-20 18:58:05,779 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7619 ImplicationChecksByTransitivity, 176.2s TimeCoverageRelationStatistics Valid=3639, Invalid=21801, Unknown=0, NotChecked=0, Total=25440 [2022-03-20 18:58:05,779 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 318 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1226 mSolverCounterSat, 751 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 1977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 751 IncrementalHoareTripleChecker+Valid, 1226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:58:05,779 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 130 Invalid, 1977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [751 Valid, 1226 Invalid, 0 Unknown, 0 Unchecked, 14.2s Time] [2022-03-20 18:58:05,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-03-20 18:58:05,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 186. [2022-03-20 18:58:05,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 181 states have (on average 1.2099447513812154) internal successors, (219), 181 states have internal predecessors, (219), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:05,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 223 transitions. [2022-03-20 18:58:05,911 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 223 transitions. Word has length 42 [2022-03-20 18:58:05,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:58:05,911 INFO L478 AbstractCegarLoop]: Abstraction has 186 states and 223 transitions. [2022-03-20 18:58:05,912 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 29 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:05,912 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 223 transitions. [2022-03-20 18:58:05,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:58:05,912 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:58:05,912 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:58:05,928 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 18:58:06,128 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-20 18:58:06,129 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:58:06,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:58:06,129 INFO L85 PathProgramCache]: Analyzing trace with hash -1838237720, now seen corresponding path program 30 times [2022-03-20 18:58:06,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:06,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [443088414] [2022-03-20 18:58:06,258 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:58:06,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1106018343, now seen corresponding path program 1 times [2022-03-20 18:58:06,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:58:06,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705096294] [2022-03-20 18:58:06,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:06,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:58:06,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:10,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:58:10,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:10,012 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 18:58:10,012 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:58:10,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705096294] [2022-03-20 18:58:10,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705096294] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:58:10,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016822734] [2022-03-20 18:58:10,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:10,012 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:58:10,013 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:58:10,014 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:58:10,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 18:58:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:10,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 18:58:10,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:58:10,496 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 18:58:10,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:58:13,666 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-03-20 18:58:13,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016822734] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:58:13,667 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:58:13,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 28 [2022-03-20 18:58:17,069 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:58:17,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [443088414] [2022-03-20 18:58:17,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [443088414] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:58:17,070 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:58:17,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:58:17,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583805918] [2022-03-20 18:58:17,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:58:17,070 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:58:17,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:17,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:58:17,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=717, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:58:17,071 INFO L87 Difference]: Start difference. First operand 186 states and 223 transitions. Second operand has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:29,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:58:29,014 INFO L93 Difference]: Finished difference Result 288 states and 351 transitions. [2022-03-20 18:58:29,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:58:29,014 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-20 18:58:29,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:58:29,015 INFO L225 Difference]: With dead ends: 288 [2022-03-20 18:58:29,015 INFO L226 Difference]: Without dead ends: 282 [2022-03-20 18:58:29,016 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=728, Invalid=2242, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:58:29,016 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 126 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:58:29,016 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 72 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-03-20 18:58:29,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-03-20 18:58:29,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 201. [2022-03-20 18:58:29,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.2091836734693877) internal successors, (237), 196 states have internal predecessors, (237), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:29,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 241 transitions. [2022-03-20 18:58:29,151 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 241 transitions. Word has length 43 [2022-03-20 18:58:29,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:58:29,151 INFO L478 AbstractCegarLoop]: Abstraction has 201 states and 241 transitions. [2022-03-20 18:58:29,152 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.380952380952381) internal successors, (29), 20 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:58:29,152 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 241 transitions. [2022-03-20 18:58:29,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:58:29,152 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:58:29,152 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:58:29,169 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-20 18:58:29,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 18:58:29,359 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:58:29,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:58:29,360 INFO L85 PathProgramCache]: Analyzing trace with hash -7434424, now seen corresponding path program 31 times [2022-03-20 18:58:29,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:58:29,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [385038125] [2022-03-20 18:58:29,492 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:58:29,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1542719975, now seen corresponding path program 1 times [2022-03-20 18:58:29,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:58:29,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910425402] [2022-03-20 18:58:29,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:29,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:58:29,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:52,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:58:52,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:52,177 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:58:52,177 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:58:52,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910425402] [2022-03-20 18:58:52,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910425402] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:58:52,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375107474] [2022-03-20 18:58:52,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:58:52,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:58:52,177 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:58:52,178 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:58:52,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 18:58:52,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:58:52,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-20 18:58:52,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:59:05,382 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:59:05,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:59:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:59:47,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375107474] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:59:47,303 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:59:47,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 29, 29] total 81 [2022-03-20 19:00:12,051 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:00:12,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [385038125] [2022-03-20 19:00:12,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [385038125] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:00:12,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:00:12,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 19:00:12,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202182658] [2022-03-20 19:00:12,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:00:12,052 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 19:00:12,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:00:12,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 19:00:12,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=7201, Unknown=4, NotChecked=0, Total=7832 [2022-03-20 19:00:12,052 INFO L87 Difference]: Start difference. First operand 201 states and 241 transitions. Second operand has 37 states, 37 states have (on average 1.054054054054054) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)