/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-de51.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 08:20:04,473 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 08:20:04,474 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 08:20:04,511 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 08:20:04,547 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 08:20:04,547 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 08:20:04,552 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 08:20:04,552 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 08:20:04,564 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 08:20:04,565 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 08:20:04,566 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 08:20:04,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 08:20:04,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 08:20:04,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:20:04,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 08:20:04,568 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 08:20:04,770 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 08:20:04,791 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 08:20:04,792 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 08:20:04,793 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 08:20:04,793 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 08:20:04,794 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de51.c [2022-03-19 08:20:04,840 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c0a71f05/66205ff91c3c4a499b3d6033b325d7d9/FLAG59fef8f67 [2022-03-19 08:20:05,205 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 08:20:05,206 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c [2022-03-19 08:20:05,209 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c0a71f05/66205ff91c3c4a499b3d6033b325d7d9/FLAG59fef8f67 [2022-03-19 08:20:05,635 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c0a71f05/66205ff91c3c4a499b3d6033b325d7d9 [2022-03-19 08:20:05,637 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 08:20:05,638 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 08:20:05,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 08:20:05,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 08:20:05,644 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 08:20:05,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c5c63bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05, skipping insertion in model container [2022-03-19 08:20:05,645 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,650 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 08:20:05,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 08:20:05,866 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-de51.c[368,381] [2022-03-19 08:20:05,880 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:20:05,887 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 08:20:05,897 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-de51.c[368,381] [2022-03-19 08:20:05,905 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:20:05,916 INFO L208 MainTranslator]: Completed translation [2022-03-19 08:20:05,917 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05 WrapperNode [2022-03-19 08:20:05,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 08:20:05,919 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 08:20:05,920 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 08:20:05,920 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 08:20:05,927 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,932 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,933 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,942 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,947 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,951 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,955 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 08:20:05,956 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 08:20:05,956 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 08:20:05,956 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 08:20:05,957 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (1/1) ... [2022-03-19 08:20:05,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:20:05,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:05,985 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-19 08:20:06,017 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-19 08:20:06,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 08:20:06,032 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 08:20:06,032 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 08:20:06,032 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 08:20:06,032 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 08:20:06,032 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 08:20:06,032 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 08:20:06,032 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 08:20:06,033 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 08:20:06,034 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 08:20:06,034 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 08:20:06,035 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 08:20:06,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 08:20:06,085 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 08:20:06,086 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 08:20:06,231 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 08:20:06,241 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 08:20:06,241 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-03-19 08:20:06,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:20:06 BoogieIcfgContainer [2022-03-19 08:20:06,243 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 08:20:06,244 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 08:20:06,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 08:20:06,261 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 08:20:06,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 08:20:05" (1/3) ... [2022-03-19 08:20:06,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3527ba77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:20:06, skipping insertion in model container [2022-03-19 08:20:06,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:20:05" (2/3) ... [2022-03-19 08:20:06,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3527ba77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:20:06, skipping insertion in model container [2022-03-19 08:20:06,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:20:06" (3/3) ... [2022-03-19 08:20:06,264 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de51.c [2022-03-19 08:20:06,267 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 08:20:06,267 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 08:20:06,314 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 08:20:06,319 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-19 08:20:06,319 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 08:20:06,330 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 08:20:06,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:20:06,335 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:06,335 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:06,336 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:06,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:06,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 1 times [2022-03-19 08:20:06,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1428400263] [2022-03-19 08:20:06,352 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:20:06,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 2 times [2022-03-19 08:20:06,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:06,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096619251] [2022-03-19 08:20:06,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:06,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:06,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:06,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:06,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:06,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:06,522 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:06,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096619251] [2022-03-19 08:20:06,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096619251] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:06,523 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:06,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:20:06,528 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:06,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1428400263] [2022-03-19 08:20:06,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1428400263] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:06,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:06,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:20:06,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696362290] [2022-03-19 08:20:06,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:06,532 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 08:20:06,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 08:20:06,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:20:06,554 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:06,601 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2022-03-19 08:20:06,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 08:20:06,602 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:20:06,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:06,612 INFO L225 Difference]: With dead ends: 41 [2022-03-19 08:20:06,612 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 08:20:06,615 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:20:06,620 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:06,622 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 30 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:20:06,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 08:20:06,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 08:20:06,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-03-19 08:20:06,659 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 16 [2022-03-19 08:20:06,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:06,659 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-03-19 08:20:06,659 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,659 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-03-19 08:20:06,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 08:20:06,660 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:06,660 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:06,660 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 08:20:06,660 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:06,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:06,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 1 times [2022-03-19 08:20:06,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2117722015] [2022-03-19 08:20:06,661 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:20:06,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 2 times [2022-03-19 08:20:06,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:06,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117848661] [2022-03-19 08:20:06,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:06,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:06,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:06,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:06,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:06,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:06,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:06,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117848661] [2022-03-19 08:20:06,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117848661] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:06,847 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:06,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:20:06,847 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:06,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2117722015] [2022-03-19 08:20:06,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2117722015] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:06,848 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:06,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:20:06,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061783859] [2022-03-19 08:20:06,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:06,848 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:20:06,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:20:06,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:20:06,849 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:06,961 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-03-19 08:20:06,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:20:06,961 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 08:20:06,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:06,962 INFO L225 Difference]: With dead ends: 28 [2022-03-19 08:20:06,962 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:20:06,962 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:20:06,963 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:06,963 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:06,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:20:06,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 08:20:06,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-03-19 08:20:06,985 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 16 [2022-03-19 08:20:06,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:06,986 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-03-19 08:20:06,986 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:06,986 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-03-19 08:20:06,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:20:06,986 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:06,986 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:06,987 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 08:20:06,987 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:06,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:06,987 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 1 times [2022-03-19 08:20:06,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1907001128] [2022-03-19 08:20:06,988 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-19 08:20:06,988 INFO L85 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 2 times [2022-03-19 08:20:06,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:06,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712071247] [2022-03-19 08:20:06,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:06,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:06,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:07,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:07,045 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:07,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712071247] [2022-03-19 08:20:07,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712071247] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,046 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:20:07,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:07,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1907001128] [2022-03-19 08:20:07,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1907001128] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:20:07,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488384586] [2022-03-19 08:20:07,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:07,050 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:20:07,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:20:07,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:20:07,052 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:07,092 INFO L93 Difference]: Finished difference Result 35 states and 48 transitions. [2022-03-19 08:20:07,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:20:07,092 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 08:20:07,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:07,093 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:20:07,093 INFO L226 Difference]: Without dead ends: 28 [2022-03-19 08:20:07,093 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:20:07,094 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:07,094 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 26 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:20:07,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-19 08:20:07,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-19 08:20:07,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2022-03-19 08:20:07,101 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 17 [2022-03-19 08:20:07,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:07,101 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2022-03-19 08:20:07,101 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,102 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2022-03-19 08:20:07,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:20:07,102 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:07,102 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:07,102 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 08:20:07,103 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:07,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:07,103 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 1 times [2022-03-19 08:20:07,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [462808402] [2022-03-19 08:20:07,104 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-19 08:20:07,104 INFO L85 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 2 times [2022-03-19 08:20:07,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:07,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135504428] [2022-03-19 08:20:07,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:07,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:07,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:07,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:07,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:07,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135504428] [2022-03-19 08:20:07,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135504428] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:20:07,132 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:07,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [462808402] [2022-03-19 08:20:07,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [462808402] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,132 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:20:07,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749144500] [2022-03-19 08:20:07,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:07,133 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:20:07,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:20:07,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:20:07,134 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:07,169 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2022-03-19 08:20:07,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:20:07,170 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 08:20:07,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:07,171 INFO L225 Difference]: With dead ends: 44 [2022-03-19 08:20:07,172 INFO L226 Difference]: Without dead ends: 34 [2022-03-19 08:20:07,172 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:20:07,173 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:07,173 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 25 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:20:07,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-19 08:20:07,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2022-03-19 08:20:07,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 44 transitions. [2022-03-19 08:20:07,181 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 44 transitions. Word has length 17 [2022-03-19 08:20:07,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:07,181 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 44 transitions. [2022-03-19 08:20:07,181 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,181 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 44 transitions. [2022-03-19 08:20:07,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:20:07,182 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:07,182 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:07,182 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-19 08:20:07,182 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:07,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:07,183 INFO L85 PathProgramCache]: Analyzing trace with hash -578961840, now seen corresponding path program 1 times [2022-03-19 08:20:07,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1194857251] [2022-03-19 08:20:07,339 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:07,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1386235727, now seen corresponding path program 1 times [2022-03-19 08:20:07,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:07,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043022905] [2022-03-19 08:20:07,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:07,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:07,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:07,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:07,732 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:07,732 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:07,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043022905] [2022-03-19 08:20:07,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043022905] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,732 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:07,836 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:07,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1194857251] [2022-03-19 08:20:07,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1194857251] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:07,836 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:07,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:07,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984977123] [2022-03-19 08:20:07,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:07,837 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:20:07,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:20:07,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:20:07,838 INFO L87 Difference]: Start difference. First operand 32 states and 44 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:07,968 INFO L93 Difference]: Finished difference Result 44 states and 61 transitions. [2022-03-19 08:20:07,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 08:20:07,969 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 08:20:07,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:07,970 INFO L225 Difference]: With dead ends: 44 [2022-03-19 08:20:07,970 INFO L226 Difference]: Without dead ends: 26 [2022-03-19 08:20:07,970 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:20:07,971 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:07,971 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 49 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:07,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-19 08:20:07,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-19 08:20:07,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2022-03-19 08:20:07,975 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 17 [2022-03-19 08:20:07,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:07,975 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2022-03-19 08:20:07,976 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:07,976 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2022-03-19 08:20:07,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:20:07,976 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:07,976 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:07,976 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-19 08:20:07,976 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:07,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:07,977 INFO L85 PathProgramCache]: Analyzing trace with hash 388404751, now seen corresponding path program 1 times [2022-03-19 08:20:07,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:07,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [833260063] [2022-03-19 08:20:08,206 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:08,207 INFO L85 PathProgramCache]: Analyzing trace with hash -679545490, now seen corresponding path program 1 times [2022-03-19 08:20:08,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:08,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907667509] [2022-03-19 08:20:08,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:08,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:08,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:08,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:08,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:08,380 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:08,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907667509] [2022-03-19 08:20:08,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907667509] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:08,380 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:08,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:20:08,448 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:08,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [833260063] [2022-03-19 08:20:08,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [833260063] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:08,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:08,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:20:08,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896370083] [2022-03-19 08:20:08,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:08,449 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:20:08,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:08,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:20:08,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:20:08,450 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) 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) [2022-03-19 08:20:08,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:08,784 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-03-19 08:20:08,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:20:08,785 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) 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 [2022-03-19 08:20:08,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:08,785 INFO L225 Difference]: With dead ends: 32 [2022-03-19 08:20:08,785 INFO L226 Difference]: Without dead ends: 25 [2022-03-19 08:20:08,786 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-19 08:20:08,786 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:08,786 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 45 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:08,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-19 08:20:08,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-19 08:20:08,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:08,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2022-03-19 08:20:08,791 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 17 [2022-03-19 08:20:08,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:08,791 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2022-03-19 08:20:08,791 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) 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) [2022-03-19 08:20:08,791 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2022-03-19 08:20:08,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 08:20:08,792 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:08,792 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:08,792 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-19 08:20:08,792 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:08,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:08,792 INFO L85 PathProgramCache]: Analyzing trace with hash 1130976308, now seen corresponding path program 1 times [2022-03-19 08:20:08,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:08,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [431247842] [2022-03-19 08:20:08,995 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:08,996 INFO L85 PathProgramCache]: Analyzing trace with hash -951480075, now seen corresponding path program 1 times [2022-03-19 08:20:08,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:08,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942087200] [2022-03-19 08:20:08,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:08,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:09,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:09,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:09,041 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:09,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942087200] [2022-03-19 08:20:09,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942087200] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:09,041 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:09,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:20:09,052 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:09,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [431247842] [2022-03-19 08:20:09,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [431247842] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:09,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:09,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:20:09,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667102009] [2022-03-19 08:20:09,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:09,053 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:20:09,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:09,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:20:09,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:20:09,054 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:09,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:09,131 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2022-03-19 08:20:09,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:20:09,131 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-19 08:20:09,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:09,132 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:20:09,132 INFO L226 Difference]: Without dead ends: 26 [2022-03-19 08:20:09,132 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:20:09,133 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:09,133 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 29 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:20:09,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-19 08:20:09,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2022-03-19 08:20:09,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:09,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2022-03-19 08:20:09,138 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 18 [2022-03-19 08:20:09,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:09,138 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2022-03-19 08:20:09,138 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:09,138 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2022-03-19 08:20:09,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 08:20:09,138 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:09,139 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:09,139 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-19 08:20:09,139 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:09,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:09,139 INFO L85 PathProgramCache]: Analyzing trace with hash 629336803, now seen corresponding path program 1 times [2022-03-19 08:20:09,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:09,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1416390984] [2022-03-19 08:20:09,267 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:09,268 INFO L85 PathProgramCache]: Analyzing trace with hash -493889564, now seen corresponding path program 1 times [2022-03-19 08:20:09,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:09,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644738287] [2022-03-19 08:20:09,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:09,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,317 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:09,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:09,322 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:09,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644738287] [2022-03-19 08:20:09,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644738287] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:09,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224740353] [2022-03-19 08:20:09,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:09,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:09,324 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:09,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 08:20:09,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-19 08:20:09,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:09,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:09,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:09,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:09,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224740353] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:09,449 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 08:20:09,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 8 [2022-03-19 08:20:09,464 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:09,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1416390984] [2022-03-19 08:20:09,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1416390984] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:09,465 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:09,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:20:09,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150206386] [2022-03-19 08:20:09,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:09,465 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 08:20:09,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:09,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 08:20:09,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:20:09,466 INFO L87 Difference]: Start difference. First operand 22 states and 28 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) [2022-03-19 08:20:09,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:09,505 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2022-03-19 08:20:09,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:20:09,505 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 [2022-03-19 08:20:09,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:09,506 INFO L225 Difference]: With dead ends: 30 [2022-03-19 08:20:09,506 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:20:09,506 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:20:09,506 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:09,507 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 51 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:20:09,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:20:09,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-03-19 08:20:09,510 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) [2022-03-19 08:20:09,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-03-19 08:20:09,511 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 18 [2022-03-19 08:20:09,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:09,511 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-03-19 08:20:09,511 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) [2022-03-19 08:20:09,511 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-03-19 08:20:09,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:20:09,511 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:09,511 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:09,531 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:09,728 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:09,728 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:09,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:09,728 INFO L85 PathProgramCache]: Analyzing trace with hash 9935328, now seen corresponding path program 1 times [2022-03-19 08:20:09,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:09,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [693619127] [2022-03-19 08:20:09,867 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:09,868 INFO L85 PathProgramCache]: Analyzing trace with hash -778984257, now seen corresponding path program 1 times [2022-03-19 08:20:09,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:09,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569495362] [2022-03-19 08:20:09,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:09,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:09,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:09,933 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:09,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569495362] [2022-03-19 08:20:09,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569495362] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:09,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477842519] [2022-03-19 08:20:09,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:09,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:09,934 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:09,956 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 08:20:09,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:09,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:20:09,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:10,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:10,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:10,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:10,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477842519] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:10,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:10,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 12 [2022-03-19 08:20:10,149 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:10,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [693619127] [2022-03-19 08:20:10,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [693619127] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:10,149 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:10,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:10,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332788270] [2022-03-19 08:20:10,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:10,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:10,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:10,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:10,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:20:10,150 INFO L87 Difference]: Start difference. First operand 20 states and 24 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) [2022-03-19 08:20:10,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:10,310 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2022-03-19 08:20:10,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 08:20:10,311 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 [2022-03-19 08:20:10,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:10,311 INFO L225 Difference]: With dead ends: 35 [2022-03-19 08:20:10,311 INFO L226 Difference]: Without dead ends: 29 [2022-03-19 08:20:10,311 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:20:10,312 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:10,312 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 37 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:10,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-19 08:20:10,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2022-03-19 08:20:10,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:10,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2022-03-19 08:20:10,318 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 19 [2022-03-19 08:20:10,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:10,318 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2022-03-19 08:20:10,318 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) [2022-03-19 08:20:10,318 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2022-03-19 08:20:10,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-19 08:20:10,318 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:10,318 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:10,337 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:10,527 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,SelfDestructingSolverStorable8 [2022-03-19 08:20:10,527 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:10,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:10,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1745318674, now seen corresponding path program 1 times [2022-03-19 08:20:10,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:10,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1657169381] [2022-03-19 08:20:10,687 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:10,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1460692051, now seen corresponding path program 1 times [2022-03-19 08:20:10,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:10,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040476607] [2022-03-19 08:20:10,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:10,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:10,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:10,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:10,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:10,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:10,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040476607] [2022-03-19 08:20:10,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040476607] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:10,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033823479] [2022-03-19 08:20:10,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:10,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:10,742 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:10,743 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:10,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 08:20:10,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:10,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 08:20:10,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:10,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:10,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:10,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033823479] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:10,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:10,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2022-03-19 08:20:10,907 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:10,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1657169381] [2022-03-19 08:20:10,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1657169381] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:10,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:10,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:20:10,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609035052] [2022-03-19 08:20:10,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:10,908 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:20:10,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:10,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:20:10,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:20:10,908 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:11,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:11,005 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-03-19 08:20:11,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:20:11,006 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-19 08:20:11,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:11,006 INFO L225 Difference]: With dead ends: 38 [2022-03-19 08:20:11,006 INFO L226 Difference]: Without dead ends: 33 [2022-03-19 08:20:11,007 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:20:11,007 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:11,007 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 33 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:11,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-19 08:20:11,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2022-03-19 08:20:11,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 24 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:11,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2022-03-19 08:20:11,013 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 20 [2022-03-19 08:20:11,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:11,014 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2022-03-19 08:20:11,014 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:11,014 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2022-03-19 08:20:11,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:20:11,014 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:11,014 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:11,033 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:11,227 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:11,227 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:11,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:11,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1695200847, now seen corresponding path program 1 times [2022-03-19 08:20:11,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:11,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1312868708] [2022-03-19 08:20:11,363 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:11,364 INFO L85 PathProgramCache]: Analyzing trace with hash 75294800, now seen corresponding path program 1 times [2022-03-19 08:20:11,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:11,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419172358] [2022-03-19 08:20:11,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:11,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:11,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:11,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:11,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:11,662 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:11,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419172358] [2022-03-19 08:20:11,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419172358] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:11,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286310411] [2022-03-19 08:20:11,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:11,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:11,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:11,664 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:11,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 08:20:11,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:11,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-19 08:20:11,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:12,142 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:12,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:13,549 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:13,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286310411] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:13,549 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:13,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 29 [2022-03-19 08:20:13,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:13,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1312868708] [2022-03-19 08:20:13,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1312868708] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:13,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:13,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:20:13,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252754334] [2022-03-19 08:20:13,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:13,659 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:20:13,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:13,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:20:13,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=769, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:20:13,660 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:14,129 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-03-19 08:20:14,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:20:14,129 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 08:20:14,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:14,130 INFO L225 Difference]: With dead ends: 47 [2022-03-19 08:20:14,130 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 08:20:14,131 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=267, Invalid=1373, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 08:20:14,132 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 31 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:14,132 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 55 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:14,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 08:20:14,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2022-03-19 08:20:14,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 28 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-03-19 08:20:14,139 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 21 [2022-03-19 08:20:14,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:14,139 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-03-19 08:20:14,139 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,139 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-03-19 08:20:14,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:20:14,140 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:14,140 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:14,157 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:14,352 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:14,353 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:14,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:14,353 INFO L85 PathProgramCache]: Analyzing trace with hash -794011953, now seen corresponding path program 2 times [2022-03-19 08:20:14,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:14,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [271773652] [2022-03-19 08:20:14,476 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:14,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1314497234, now seen corresponding path program 1 times [2022-03-19 08:20:14,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:14,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180435450] [2022-03-19 08:20:14,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:14,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:14,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:14,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:14,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:14,534 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:14,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180435450] [2022-03-19 08:20:14,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180435450] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:14,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441713306] [2022-03-19 08:20:14,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:14,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:14,535 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:14,536 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:14,537 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 08:20:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:14,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:20:14,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:14,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:14,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:14,723 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:14,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441713306] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:14,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:14,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2022-03-19 08:20:14,745 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:14,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [271773652] [2022-03-19 08:20:14,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [271773652] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:14,746 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:14,746 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:14,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972281397] [2022-03-19 08:20:14,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:14,747 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:14,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:14,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:14,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:20:14,748 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:14,939 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-03-19 08:20:14,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 08:20:14,940 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 08:20:14,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:14,940 INFO L225 Difference]: With dead ends: 50 [2022-03-19 08:20:14,940 INFO L226 Difference]: Without dead ends: 39 [2022-03-19 08:20:14,941 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:20:14,941 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:14,942 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 42 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:14,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-19 08:20:14,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2022-03-19 08:20:14,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-03-19 08:20:14,951 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 21 [2022-03-19 08:20:14,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:14,951 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-03-19 08:20:14,951 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:14,951 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-03-19 08:20:14,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:20:14,953 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:14,954 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:14,990 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:15,167 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,SelfDestructingSolverStorable11 [2022-03-19 08:20:15,168 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:15,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:15,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1058899791, now seen corresponding path program 1 times [2022-03-19 08:20:15,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:15,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1874363951] [2022-03-19 08:20:15,270 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:15,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1752566418, now seen corresponding path program 1 times [2022-03-19 08:20:15,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:15,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898899881] [2022-03-19 08:20:15,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:15,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:15,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:15,338 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:15,343 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:15,344 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:15,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898899881] [2022-03-19 08:20:15,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898899881] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:15,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881398535] [2022-03-19 08:20:15,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:15,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:15,344 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:15,345 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:15,347 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 08:20:15,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:15,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:20:15,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:15,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:15,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:15,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:15,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881398535] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:15,523 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:15,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-03-19 08:20:15,537 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:15,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1874363951] [2022-03-19 08:20:15,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1874363951] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:15,538 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:15,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:15,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000447706] [2022-03-19 08:20:15,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:15,538 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:15,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:15,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:15,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:20:15,539 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:15,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:15,687 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2022-03-19 08:20:15,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:20:15,687 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 08:20:15,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:15,687 INFO L225 Difference]: With dead ends: 43 [2022-03-19 08:20:15,688 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 08:20:15,688 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:20:15,688 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:15,688 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 43 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 08:20:15,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2022-03-19 08:20:15,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:15,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-03-19 08:20:15,695 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 21 [2022-03-19 08:20:15,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:15,695 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-03-19 08:20:15,695 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:15,695 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-03-19 08:20:15,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:20:15,695 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:15,695 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:15,714 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:15,912 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:15,913 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:15,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:15,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1295231697, now seen corresponding path program 2 times [2022-03-19 08:20:15,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:15,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [696413687] [2022-03-19 08:20:16,011 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:16,011 INFO L85 PathProgramCache]: Analyzing trace with hash -2102711538, now seen corresponding path program 1 times [2022-03-19 08:20:16,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:16,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271356990] [2022-03-19 08:20:16,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:16,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:16,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:16,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,088 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:16,088 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:16,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271356990] [2022-03-19 08:20:16,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271356990] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:16,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784854609] [2022-03-19 08:20:16,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:16,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:16,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:16,090 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:16,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 08:20:16,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:20:16,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:16,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:16,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:16,206 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:16,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784854609] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:16,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:16,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 11 [2022-03-19 08:20:16,256 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:16,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [696413687] [2022-03-19 08:20:16,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [696413687] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:16,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:16,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:16,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452527882] [2022-03-19 08:20:16,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:16,257 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:16,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:16,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:16,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-03-19 08:20:16,258 INFO L87 Difference]: Start difference. First operand 28 states and 33 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) [2022-03-19 08:20:16,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:16,503 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2022-03-19 08:20:16,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 08:20:16,503 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 21 [2022-03-19 08:20:16,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:16,504 INFO L225 Difference]: With dead ends: 47 [2022-03-19 08:20:16,504 INFO L226 Difference]: Without dead ends: 41 [2022-03-19 08:20:16,504 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:20:16,505 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:16,505 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 46 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:16,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-19 08:20:16,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2022-03-19 08:20:16,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 29 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:16,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2022-03-19 08:20:16,515 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 21 [2022-03-19 08:20:16,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:16,515 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2022-03-19 08:20:16,515 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) [2022-03-19 08:20:16,515 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2022-03-19 08:20:16,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:20:16,515 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:16,515 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:16,532 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:16,727 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:16,727 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:16,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:16,728 INFO L85 PathProgramCache]: Analyzing trace with hash -977123598, now seen corresponding path program 2 times [2022-03-19 08:20:16,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:16,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1396890447] [2022-03-19 08:20:16,855 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:16,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1754840371, now seen corresponding path program 1 times [2022-03-19 08:20:16,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:16,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616074436] [2022-03-19 08:20:16,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:16,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:16,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:16,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:20:16,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:16,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616074436] [2022-03-19 08:20:16,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616074436] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:16,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883255913] [2022-03-19 08:20:16,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:16,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:16,896 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:16,897 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:16,898 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 08:20:16,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:16,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:20:16,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:16,992 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:16,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:17,099 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:17,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883255913] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:17,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:17,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 11 [2022-03-19 08:20:17,114 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:17,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1396890447] [2022-03-19 08:20:17,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1396890447] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:17,115 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:17,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:20:17,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032800593] [2022-03-19 08:20:17,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:17,115 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:20:17,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:17,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:20:17,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:20:17,115 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:17,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:17,266 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2022-03-19 08:20:17,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:20:17,266 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-19 08:20:17,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:17,268 INFO L225 Difference]: With dead ends: 43 [2022-03-19 08:20:17,268 INFO L226 Difference]: Without dead ends: 31 [2022-03-19 08:20:17,269 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:20:17,270 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:17,271 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 33 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:17,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-19 08:20:17,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-03-19 08:20:17,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:17,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-03-19 08:20:17,303 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2022-03-19 08:20:17,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:17,304 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-03-19 08:20:17,304 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:17,304 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-03-19 08:20:17,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 08:20:17,305 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:17,305 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:17,323 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:17,521 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,SelfDestructingSolverStorable14 [2022-03-19 08:20:17,522 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:17,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:17,522 INFO L85 PathProgramCache]: Analyzing trace with hash -60153437, now seen corresponding path program 3 times [2022-03-19 08:20:17,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:17,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1280007192] [2022-03-19 08:20:17,653 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:17,654 INFO L85 PathProgramCache]: Analyzing trace with hash 370878500, now seen corresponding path program 1 times [2022-03-19 08:20:17,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:17,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556033763] [2022-03-19 08:20:17,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:17,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:17,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:17,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:17,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:17,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:17,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:17,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556033763] [2022-03-19 08:20:17,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556033763] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:17,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073941501] [2022-03-19 08:20:17,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:17,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:17,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:17,796 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:17,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 08:20:17,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:17,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:20:17,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:17,933 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:17,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:17,970 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:17,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073941501] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:17,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:17,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5] total 13 [2022-03-19 08:20:18,055 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:18,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1280007192] [2022-03-19 08:20:18,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1280007192] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:18,056 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:18,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:18,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956582305] [2022-03-19 08:20:18,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:18,056 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:20:18,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:18,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:20:18,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:20:18,056 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:18,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:18,350 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2022-03-19 08:20:18,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:20:18,350 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-19 08:20:18,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:18,350 INFO L225 Difference]: With dead ends: 42 [2022-03-19 08:20:18,351 INFO L226 Difference]: Without dead ends: 36 [2022-03-19 08:20:18,351 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:20:18,352 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 27 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:18,352 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 50 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:18,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-19 08:20:18,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-03-19 08:20:18,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 27 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:18,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-03-19 08:20:18,358 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 22 [2022-03-19 08:20:18,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:18,358 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-03-19 08:20:18,359 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:18,359 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-03-19 08:20:18,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 08:20:18,359 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:18,359 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:18,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:18,571 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,SelfDestructingSolverStorable15 [2022-03-19 08:20:18,572 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:18,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:18,573 INFO L85 PathProgramCache]: Analyzing trace with hash -427433041, now seen corresponding path program 4 times [2022-03-19 08:20:18,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:18,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1252638261] [2022-03-19 08:20:18,698 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:18,699 INFO L85 PathProgramCache]: Analyzing trace with hash 1735206158, now seen corresponding path program 1 times [2022-03-19 08:20:18,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:18,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914251079] [2022-03-19 08:20:18,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:18,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:18,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:18,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:18,765 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:18,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:18,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914251079] [2022-03-19 08:20:18,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914251079] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:18,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378008207] [2022-03-19 08:20:18,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:18,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:18,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:18,767 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:18,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 08:20:18,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:18,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-19 08:20:18,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:18,876 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:18,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:18,923 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:18,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378008207] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:18,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:18,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 9 [2022-03-19 08:20:18,935 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:18,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1252638261] [2022-03-19 08:20:18,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1252638261] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:18,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:18,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:18,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977570592] [2022-03-19 08:20:18,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:18,936 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:18,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:18,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:18,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-03-19 08:20:18,937 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:19,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:19,086 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2022-03-19 08:20:19,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:20:19,087 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-19 08:20:19,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:19,087 INFO L225 Difference]: With dead ends: 52 [2022-03-19 08:20:19,087 INFO L226 Difference]: Without dead ends: 47 [2022-03-19 08:20:19,087 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:20:19,088 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:19,089 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 32 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:19,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-19 08:20:19,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2022-03-19 08:20:19,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:19,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2022-03-19 08:20:19,099 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 23 [2022-03-19 08:20:19,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:19,099 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2022-03-19 08:20:19,099 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:19,099 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2022-03-19 08:20:19,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 08:20:19,099 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:19,099 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:19,132 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:19,333 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,SelfDestructingSolverStorable16 [2022-03-19 08:20:19,333 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:19,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:19,333 INFO L85 PathProgramCache]: Analyzing trace with hash -1594121644, now seen corresponding path program 5 times [2022-03-19 08:20:19,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:19,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [754289886] [2022-03-19 08:20:19,418 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:19,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1735658773, now seen corresponding path program 1 times [2022-03-19 08:20:19,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:19,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563523361] [2022-03-19 08:20:19,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:19,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:19,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:19,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:19,547 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:19,547 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:19,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563523361] [2022-03-19 08:20:19,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563523361] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:19,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886256897] [2022-03-19 08:20:19,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:19,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:19,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:19,548 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:19,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 08:20:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:19,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:20:19,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:19,701 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:19,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:19,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886256897] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:19,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:19,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2022-03-19 08:20:19,836 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:19,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [754289886] [2022-03-19 08:20:19,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [754289886] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:19,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:19,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:20:19,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708860514] [2022-03-19 08:20:19,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:19,837 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:20:19,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:19,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:20:19,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:20:19,837 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:20,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:20,129 INFO L93 Difference]: Finished difference Result 90 states and 122 transitions. [2022-03-19 08:20:20,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 08:20:20,129 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-19 08:20:20,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:20,130 INFO L225 Difference]: With dead ends: 90 [2022-03-19 08:20:20,130 INFO L226 Difference]: Without dead ends: 58 [2022-03-19 08:20:20,130 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 53 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:20:20,130 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:20,131 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 51 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:20,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-19 08:20:20,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 39. [2022-03-19 08:20:20,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.3235294117647058) internal successors, (45), 34 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:20,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 49 transitions. [2022-03-19 08:20:20,139 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 49 transitions. Word has length 24 [2022-03-19 08:20:20,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:20,140 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 49 transitions. [2022-03-19 08:20:20,140 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:20,140 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 49 transitions. [2022-03-19 08:20:20,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 08:20:20,140 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:20,140 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:20,173 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:20,356 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,SelfDestructingSolverStorable17 [2022-03-19 08:20:20,356 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:20,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:20,356 INFO L85 PathProgramCache]: Analyzing trace with hash -294389697, now seen corresponding path program 6 times [2022-03-19 08:20:20,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:20,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1036134718] [2022-03-19 08:20:20,445 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:20,445 INFO L85 PathProgramCache]: Analyzing trace with hash -318387405, now seen corresponding path program 1 times [2022-03-19 08:20:20,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:20,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612214171] [2022-03-19 08:20:20,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:20,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:20,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:20,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:20,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:20,578 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:20,578 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:20,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612214171] [2022-03-19 08:20:20,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612214171] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:20,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955831568] [2022-03-19 08:20:20,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:20,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:20,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:20,592 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:20,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 08:20:20,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:20,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:20:20,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:20,768 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:20,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:20,858 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:20,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955831568] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:20,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:20,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 6] total 20 [2022-03-19 08:20:20,982 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:20,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1036134718] [2022-03-19 08:20:20,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1036134718] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:20,983 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:20,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:20,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024344565] [2022-03-19 08:20:20,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:20,983 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:20:20,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:20,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:20:20,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:20:20,984 INFO L87 Difference]: Start difference. First operand 39 states and 49 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) [2022-03-19 08:20:21,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:21,801 INFO L93 Difference]: Finished difference Result 76 states and 105 transitions. [2022-03-19 08:20:21,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:20:21,802 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 25 [2022-03-19 08:20:21,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:21,802 INFO L225 Difference]: With dead ends: 76 [2022-03-19 08:20:21,802 INFO L226 Difference]: Without dead ends: 66 [2022-03-19 08:20:21,803 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=196, Invalid=1286, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:20:21,804 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:21,804 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 58 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:20:21,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-19 08:20:21,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 52. [2022-03-19 08:20:21,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:21,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-03-19 08:20:21,826 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 25 [2022-03-19 08:20:21,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:21,826 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-03-19 08:20:21,826 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) [2022-03-19 08:20:21,826 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-03-19 08:20:21,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-19 08:20:21,828 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:21,828 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:21,847 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:22,041 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:22,041 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:22,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:22,042 INFO L85 PathProgramCache]: Analyzing trace with hash -137630238, now seen corresponding path program 3 times [2022-03-19 08:20:22,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:22,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1055835184] [2022-03-19 08:20:22,171 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:22,171 INFO L85 PathProgramCache]: Analyzing trace with hash -269680338, now seen corresponding path program 1 times [2022-03-19 08:20:22,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:22,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372652479] [2022-03-19 08:20:22,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:22,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:22,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:22,499 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:22,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:22,502 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:20:22,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:22,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372652479] [2022-03-19 08:20:22,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372652479] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:22,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358168846] [2022-03-19 08:20:22,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:22,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:22,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:22,503 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:22,504 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 08:20:22,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:22,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-19 08:20:22,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:23,282 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:23,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:25,490 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:25,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358168846] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:25,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:25,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 18] total 44 [2022-03-19 08:20:25,773 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:25,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1055835184] [2022-03-19 08:20:25,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1055835184] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:25,773 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:25,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:20:25,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478023765] [2022-03-19 08:20:25,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:25,774 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:20:25,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:25,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:20:25,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=1822, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 08:20:25,775 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:26,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:26,986 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2022-03-19 08:20:26,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 08:20:26,986 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-19 08:20:26,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:26,987 INFO L225 Difference]: With dead ends: 79 [2022-03-19 08:20:26,987 INFO L226 Difference]: Without dead ends: 68 [2022-03-19 08:20:26,988 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=522, Invalid=3138, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:20:26,989 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:26,989 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 72 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:20:26,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-19 08:20:27,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2022-03-19 08:20:27,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 51 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:27,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-03-19 08:20:27,022 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 26 [2022-03-19 08:20:27,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:27,023 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-03-19 08:20:27,023 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:27,023 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-03-19 08:20:27,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:20:27,023 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:27,023 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:27,040 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:27,239 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2022-03-19 08:20:27,240 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:27,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:27,240 INFO L85 PathProgramCache]: Analyzing trace with hash 62925025, now seen corresponding path program 4 times [2022-03-19 08:20:27,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:27,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [681284255] [2022-03-19 08:20:27,364 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:27,364 INFO L85 PathProgramCache]: Analyzing trace with hash 2052714325, now seen corresponding path program 1 times [2022-03-19 08:20:27,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:27,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032444033] [2022-03-19 08:20:27,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:27,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:27,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:27,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:27,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:27,435 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:27,435 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:27,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032444033] [2022-03-19 08:20:27,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032444033] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:27,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910427139] [2022-03-19 08:20:27,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:27,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:27,436 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:27,437 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:27,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 08:20:27,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:27,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:20:27,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:27,572 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:27,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:27,721 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:27,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910427139] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:27,721 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:27,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 10] total 15 [2022-03-19 08:20:27,769 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:27,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [681284255] [2022-03-19 08:20:27,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [681284255] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:27,770 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:27,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:20:27,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303383011] [2022-03-19 08:20:27,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:27,770 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:20:27,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:27,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:20:27,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:20:27,771 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:28,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:28,077 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2022-03-19 08:20:28,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:20:28,077 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 08:20:28,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:28,078 INFO L225 Difference]: With dead ends: 70 [2022-03-19 08:20:28,078 INFO L226 Difference]: Without dead ends: 55 [2022-03-19 08:20:28,078 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:20:28,078 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:28,079 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 38 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:28,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-19 08:20:28,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-03-19 08:20:28,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 46 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:28,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-03-19 08:20:28,098 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 27 [2022-03-19 08:20:28,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:28,098 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-03-19 08:20:28,099 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:28,099 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-03-19 08:20:28,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:20:28,099 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:28,099 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:28,136 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:28,337 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:28,337 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:28,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:28,337 INFO L85 PathProgramCache]: Analyzing trace with hash -690945345, now seen corresponding path program 7 times [2022-03-19 08:20:28,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:28,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [780264429] [2022-03-19 08:20:28,447 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:28,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1207748237, now seen corresponding path program 1 times [2022-03-19 08:20:28,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:28,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926394135] [2022-03-19 08:20:28,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:28,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:28,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:28,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:28,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:28,552 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:28,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:28,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926394135] [2022-03-19 08:20:28,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926394135] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:28,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20752184] [2022-03-19 08:20:28,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:28,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:28,553 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:28,554 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:28,554 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 08:20:28,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:28,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:20:28,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:28,668 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:28,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:28,727 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:28,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20752184] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:28,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:28,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2022-03-19 08:20:28,764 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:28,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [780264429] [2022-03-19 08:20:28,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [780264429] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:28,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:28,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:28,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586945270] [2022-03-19 08:20:28,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:28,765 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:20:28,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:28,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:20:28,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:20:28,766 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:29,173 INFO L93 Difference]: Finished difference Result 77 states and 100 transitions. [2022-03-19 08:20:29,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:20:29,175 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 08:20:29,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:29,175 INFO L225 Difference]: With dead ends: 77 [2022-03-19 08:20:29,176 INFO L226 Difference]: Without dead ends: 72 [2022-03-19 08:20:29,176 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=174, Invalid=638, Unknown=0, NotChecked=0, Total=812 [2022-03-19 08:20:29,177 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 47 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:29,177 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 35 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:29,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-19 08:20:29,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2022-03-19 08:20:29,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.280701754385965) internal successors, (73), 57 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 77 transitions. [2022-03-19 08:20:29,218 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 77 transitions. Word has length 27 [2022-03-19 08:20:29,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:29,218 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 77 transitions. [2022-03-19 08:20:29,218 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:29,218 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 77 transitions. [2022-03-19 08:20:29,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 08:20:29,218 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:29,218 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:29,235 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:29,435 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:29,435 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:29,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:29,436 INFO L85 PathProgramCache]: Analyzing trace with hash 1703289154, now seen corresponding path program 5 times [2022-03-19 08:20:29,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:29,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1324937728] [2022-03-19 08:20:29,557 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:29,557 INFO L85 PathProgramCache]: Analyzing trace with hash -1827645234, now seen corresponding path program 1 times [2022-03-19 08:20:29,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:29,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136102057] [2022-03-19 08:20:29,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:29,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:29,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:29,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:29,670 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-19 08:20:29,670 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:29,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136102057] [2022-03-19 08:20:29,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136102057] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:29,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355012277] [2022-03-19 08:20:29,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:29,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:29,671 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:29,684 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:29,685 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 08:20:29,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:29,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:20:29,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:29,779 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-19 08:20:29,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:29,895 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-19 08:20:29,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355012277] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:29,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:29,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 12 [2022-03-19 08:20:29,939 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:29,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1324937728] [2022-03-19 08:20:29,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1324937728] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:29,939 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:29,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:20:29,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597002058] [2022-03-19 08:20:29,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:29,939 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:20:29,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:29,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:20:29,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:20:29,940 INFO L87 Difference]: Start difference. First operand 62 states and 77 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:30,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:30,279 INFO L93 Difference]: Finished difference Result 71 states and 87 transitions. [2022-03-19 08:20:30,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:20:30,279 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-19 08:20:30,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:30,280 INFO L225 Difference]: With dead ends: 71 [2022-03-19 08:20:30,280 INFO L226 Difference]: Without dead ends: 55 [2022-03-19 08:20:30,280 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:20:30,280 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:30,281 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 52 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:20:30,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-19 08:20:30,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-03-19 08:20:30,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 46 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:30,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-03-19 08:20:30,299 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 28 [2022-03-19 08:20:30,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:30,299 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-03-19 08:20:30,299 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:30,299 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-03-19 08:20:30,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 08:20:30,299 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:30,299 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:30,316 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:30,504 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,SelfDestructingSolverStorable22 [2022-03-19 08:20:30,504 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:30,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:30,504 INFO L85 PathProgramCache]: Analyzing trace with hash 453627138, now seen corresponding path program 8 times [2022-03-19 08:20:30,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:30,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [478752307] [2022-03-19 08:20:30,590 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:30,590 INFO L85 PathProgramCache]: Analyzing trace with hash 822713422, now seen corresponding path program 1 times [2022-03-19 08:20:30,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:30,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929071943] [2022-03-19 08:20:30,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:30,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:30,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:30,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,765 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:30,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:30,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929071943] [2022-03-19 08:20:30,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929071943] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:30,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998442168] [2022-03-19 08:20:30,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:30,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:30,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:30,767 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:30,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 08:20:30,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:30,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:20:30,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:30,945 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:30,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:31,122 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:31,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998442168] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:31,122 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:31,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2022-03-19 08:20:31,180 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:31,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [478752307] [2022-03-19 08:20:31,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [478752307] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:31,181 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:31,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 08:20:31,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503578164] [2022-03-19 08:20:31,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:31,181 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 08:20:31,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:31,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 08:20:31,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-19 08:20:31,182 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:31,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:31,790 INFO L93 Difference]: Finished difference Result 101 states and 128 transitions. [2022-03-19 08:20:31,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:20:31,791 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-19 08:20:31,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:31,791 INFO L225 Difference]: With dead ends: 101 [2022-03-19 08:20:31,791 INFO L226 Difference]: Without dead ends: 59 [2022-03-19 08:20:31,792 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=1011, Unknown=0, NotChecked=0, Total=1190 [2022-03-19 08:20:31,792 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:31,793 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 63 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:20:31,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-19 08:20:31,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2022-03-19 08:20:31,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2619047619047619) internal successors, (53), 42 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:31,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2022-03-19 08:20:31,810 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 28 [2022-03-19 08:20:31,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:31,810 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2022-03-19 08:20:31,810 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:31,810 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2022-03-19 08:20:31,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 08:20:31,811 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:31,811 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:31,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:32,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:32,026 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:32,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:32,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1646269137, now seen corresponding path program 9 times [2022-03-19 08:20:32,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:32,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [820350582] [2022-03-19 08:20:32,141 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:32,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1240724818, now seen corresponding path program 1 times [2022-03-19 08:20:32,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:32,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083603529] [2022-03-19 08:20:32,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:32,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:32,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:32,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:32,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:32,307 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:32,307 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:32,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083603529] [2022-03-19 08:20:32,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083603529] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:32,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340144248] [2022-03-19 08:20:32,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:32,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:32,307 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:32,308 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:32,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 08:20:32,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:32,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:20:32,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:32,463 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:32,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:32,504 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:32,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340144248] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:32,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:32,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 17 [2022-03-19 08:20:32,703 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:32,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [820350582] [2022-03-19 08:20:32,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [820350582] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:32,704 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:32,704 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:20:32,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499053157] [2022-03-19 08:20:32,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:32,704 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:20:32,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:32,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:20:32,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:20:32,705 INFO L87 Difference]: Start difference. First operand 47 states and 57 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) [2022-03-19 08:20:34,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:34,113 INFO L93 Difference]: Finished difference Result 104 states and 138 transitions. [2022-03-19 08:20:34,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:20:34,113 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 29 [2022-03-19 08:20:34,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:34,114 INFO L225 Difference]: With dead ends: 104 [2022-03-19 08:20:34,114 INFO L226 Difference]: Without dead ends: 91 [2022-03-19 08:20:34,114 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=309, Invalid=1583, Unknown=0, NotChecked=0, Total=1892 [2022-03-19 08:20:34,115 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 67 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:34,115 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 65 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:20:34,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-19 08:20:34,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 59. [2022-03-19 08:20:34,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:34,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2022-03-19 08:20:34,137 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 29 [2022-03-19 08:20:34,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:34,137 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2022-03-19 08:20:34,137 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) [2022-03-19 08:20:34,138 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2022-03-19 08:20:34,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-19 08:20:34,138 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:34,138 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:34,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:34,354 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:34,355 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:34,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:34,355 INFO L85 PathProgramCache]: Analyzing trace with hash 274096195, now seen corresponding path program 10 times [2022-03-19 08:20:34,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:34,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [641093394] [2022-03-19 08:20:34,485 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:34,485 INFO L85 PathProgramCache]: Analyzing trace with hash 602624740, now seen corresponding path program 1 times [2022-03-19 08:20:34,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:34,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382498600] [2022-03-19 08:20:34,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:34,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:34,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:34,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:34,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:34,655 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:34,655 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:34,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382498600] [2022-03-19 08:20:34,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382498600] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:34,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988100509] [2022-03-19 08:20:34,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:34,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:34,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:34,657 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:34,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 08:20:34,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:34,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:20:34,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:34,788 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:34,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:35,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988100509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:35,012 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:35,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2022-03-19 08:20:35,130 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:35,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [641093394] [2022-03-19 08:20:35,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [641093394] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:35,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:35,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:20:35,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115839174] [2022-03-19 08:20:35,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:35,131 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:20:35,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:35,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:20:35,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=368, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:20:35,132 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:37,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:37,244 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2022-03-19 08:20:37,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-19 08:20:37,244 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-19 08:20:37,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:37,245 INFO L225 Difference]: With dead ends: 116 [2022-03-19 08:20:37,245 INFO L226 Difference]: Without dead ends: 83 [2022-03-19 08:20:37,246 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=491, Invalid=2371, Unknown=0, NotChecked=0, Total=2862 [2022-03-19 08:20:37,246 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 74 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:37,246 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 81 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:20:37,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-19 08:20:37,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 63. [2022-03-19 08:20:37,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 58 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:37,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-03-19 08:20:37,272 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 30 [2022-03-19 08:20:37,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:37,272 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-03-19 08:20:37,273 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:37,273 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-03-19 08:20:37,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 08:20:37,273 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:37,273 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:37,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:37,475 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:37,476 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:37,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:37,476 INFO L85 PathProgramCache]: Analyzing trace with hash -543637167, now seen corresponding path program 6 times [2022-03-19 08:20:37,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:37,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1896674315] [2022-03-19 08:20:37,579 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:37,580 INFO L85 PathProgramCache]: Analyzing trace with hash -535770480, now seen corresponding path program 1 times [2022-03-19 08:20:37,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:37,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413152825] [2022-03-19 08:20:37,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:37,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:37,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:38,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:38,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:38,179 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-03-19 08:20:38,180 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:38,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413152825] [2022-03-19 08:20:38,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413152825] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:38,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458565841] [2022-03-19 08:20:38,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:38,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:38,180 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:38,185 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:38,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 08:20:38,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:38,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:20:38,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:39,853 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:39,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:43,661 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:43,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458565841] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:43,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:43,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 22, 22] total 54 [2022-03-19 08:20:44,546 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:44,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1896674315] [2022-03-19 08:20:44,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1896674315] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:44,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:44,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:20:44,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148946388] [2022-03-19 08:20:44,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:44,547 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:20:44,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:44,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:20:44,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=2846, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 08:20:44,548 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:46,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:46,850 INFO L93 Difference]: Finished difference Result 81 states and 98 transitions. [2022-03-19 08:20:46,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:20:46,851 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 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 31 [2022-03-19 08:20:46,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:46,851 INFO L225 Difference]: With dead ends: 81 [2022-03-19 08:20:46,851 INFO L226 Difference]: Without dead ends: 69 [2022-03-19 08:20:46,853 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1323 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=691, Invalid=4711, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:20:46,853 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 30 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:46,853 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 94 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:20:46,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-19 08:20:46,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2022-03-19 08:20:46,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 61 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:46,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 79 transitions. [2022-03-19 08:20:46,890 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 79 transitions. Word has length 31 [2022-03-19 08:20:46,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:46,890 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 79 transitions. [2022-03-19 08:20:46,890 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.3) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:46,890 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 79 transitions. [2022-03-19 08:20:46,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:20:46,891 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:46,891 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:46,895 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-19 08:20:47,094 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,SelfDestructingSolverStorable26 [2022-03-19 08:20:47,095 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:47,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:47,095 INFO L85 PathProgramCache]: Analyzing trace with hash 361612114, now seen corresponding path program 7 times [2022-03-19 08:20:47,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:47,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1286397498] [2022-03-19 08:20:47,221 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:47,221 INFO L85 PathProgramCache]: Analyzing trace with hash -1333972429, now seen corresponding path program 1 times [2022-03-19 08:20:47,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:47,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527736181] [2022-03-19 08:20:47,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:47,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:47,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:47,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:47,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:47,308 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 08:20:47,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:47,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527736181] [2022-03-19 08:20:47,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527736181] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:47,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17103845] [2022-03-19 08:20:47,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:47,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:47,309 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:47,322 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:47,323 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 08:20:47,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:47,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:20:47,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:47,508 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:47,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:47,808 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:47,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17103845] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:47,809 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:47,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 13] total 20 [2022-03-19 08:20:47,987 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:47,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1286397498] [2022-03-19 08:20:47,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1286397498] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:47,987 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:47,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:20:47,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127602538] [2022-03-19 08:20:47,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:47,988 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:20:47,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:47,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:20:47,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:20:47,988 INFO L87 Difference]: Start difference. First operand 66 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:48,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:48,787 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2022-03-19 08:20:48,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:20:48,787 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 08:20:48,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:48,788 INFO L225 Difference]: With dead ends: 79 [2022-03-19 08:20:48,788 INFO L226 Difference]: Without dead ends: 61 [2022-03-19 08:20:48,788 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=190, Invalid=1216, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:20:48,789 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:48,789 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 48 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:20:48,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-19 08:20:48,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2022-03-19 08:20:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:48,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-03-19 08:20:48,813 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 32 [2022-03-19 08:20:48,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:48,813 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-03-19 08:20:48,813 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:48,813 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-03-19 08:20:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:20:48,814 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:48,814 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:48,832 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:49,027 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,SelfDestructingSolverStorable27 [2022-03-19 08:20:49,027 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:49,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:49,028 INFO L85 PathProgramCache]: Analyzing trace with hash -876076878, now seen corresponding path program 11 times [2022-03-19 08:20:49,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:49,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [934412356] [2022-03-19 08:20:49,106 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:49,106 INFO L85 PathProgramCache]: Analyzing trace with hash -216145965, now seen corresponding path program 1 times [2022-03-19 08:20:49,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:49,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170378056] [2022-03-19 08:20:49,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:49,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:49,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:49,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:49,300 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:20:49,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:49,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170378056] [2022-03-19 08:20:49,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170378056] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:49,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318033354] [2022-03-19 08:20:49,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:49,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:49,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:49,302 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:49,303 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 08:20:49,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:49,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:20:49,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:49,532 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:49,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:49,591 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:49,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318033354] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:49,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:49,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 17 [2022-03-19 08:20:49,772 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:49,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [934412356] [2022-03-19 08:20:49,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [934412356] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:49,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:49,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:20:49,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354895549] [2022-03-19 08:20:49,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:49,772 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:20:49,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:49,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:20:49,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-03-19 08:20:49,773 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:51,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:51,426 INFO L93 Difference]: Finished difference Result 135 states and 173 transitions. [2022-03-19 08:20:51,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:20:51,427 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 08:20:51,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:51,427 INFO L225 Difference]: With dead ends: 135 [2022-03-19 08:20:51,427 INFO L226 Difference]: Without dead ends: 124 [2022-03-19 08:20:51,428 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=332, Invalid=1228, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 08:20:51,428 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 148 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:51,429 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 48 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:20:51,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-19 08:20:51,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 67. [2022-03-19 08:20:51,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 62 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) [2022-03-19 08:20:51,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2022-03-19 08:20:51,464 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 32 [2022-03-19 08:20:51,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:51,464 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2022-03-19 08:20:51,464 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 13 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:51,464 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2022-03-19 08:20:51,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 08:20:51,464 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:51,464 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:51,481 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:51,674 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,SelfDestructingSolverStorable28 [2022-03-19 08:20:51,674 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:51,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:51,674 INFO L85 PathProgramCache]: Analyzing trace with hash 93956866, now seen corresponding path program 12 times [2022-03-19 08:20:51,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:51,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1668191704] [2022-03-19 08:20:51,794 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:51,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1071086638, now seen corresponding path program 1 times [2022-03-19 08:20:51,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:51,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275774952] [2022-03-19 08:20:51,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:51,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:51,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:51,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:51,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:51,942 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:51,942 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:51,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275774952] [2022-03-19 08:20:51,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275774952] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:51,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26355015] [2022-03-19 08:20:51,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:51,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:51,943 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:51,944 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:51,945 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 08:20:51,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:51,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 08:20:51,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:52,108 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:52,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:52,182 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:52,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26355015] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:52,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:52,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 15 [2022-03-19 08:20:52,398 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:52,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1668191704] [2022-03-19 08:20:52,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1668191704] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:52,398 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:52,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 08:20:52,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791011374] [2022-03-19 08:20:52,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:52,399 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 08:20:52,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:52,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 08:20:52,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:20:52,399 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:53,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:53,716 INFO L93 Difference]: Finished difference Result 90 states and 112 transitions. [2022-03-19 08:20:53,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:20:53,717 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 08:20:53,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:53,717 INFO L225 Difference]: With dead ends: 90 [2022-03-19 08:20:53,717 INFO L226 Difference]: Without dead ends: 85 [2022-03-19 08:20:53,718 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=334, Invalid=1388, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:20:53,718 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:53,718 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 57 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:20:53,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-19 08:20:53,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 76. [2022-03-19 08:20:53,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.2253521126760563) internal successors, (87), 71 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) [2022-03-19 08:20:53,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 91 transitions. [2022-03-19 08:20:53,759 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 91 transitions. Word has length 32 [2022-03-19 08:20:53,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:53,759 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 91 transitions. [2022-03-19 08:20:53,759 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:53,759 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 91 transitions. [2022-03-19 08:20:53,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 08:20:53,759 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:53,759 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:53,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:53,975 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:53,975 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:53,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:53,975 INFO L85 PathProgramCache]: Analyzing trace with hash 48744064, now seen corresponding path program 13 times [2022-03-19 08:20:53,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:53,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1860581473] [2022-03-19 08:20:54,105 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:54,105 INFO L85 PathProgramCache]: Analyzing trace with hash -955163905, now seen corresponding path program 1 times [2022-03-19 08:20:54,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:54,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415823212] [2022-03-19 08:20:54,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:54,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:54,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:54,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:54,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:54,316 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:20:54,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:54,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415823212] [2022-03-19 08:20:54,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415823212] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:54,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119446016] [2022-03-19 08:20:54,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:54,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:54,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:54,317 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:54,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 08:20:54,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:54,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:20:54,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:54,610 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:54,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:20:54,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119446016] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:54,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:54,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 17 [2022-03-19 08:20:54,985 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:54,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1860581473] [2022-03-19 08:20:54,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1860581473] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:54,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:54,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:20:54,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428652344] [2022-03-19 08:20:54,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:54,985 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:20:54,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:54,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:20:54,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:20:54,986 INFO L87 Difference]: Start difference. First operand 76 states and 91 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:57,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:57,468 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2022-03-19 08:20:57,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-19 08:20:57,469 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-19 08:20:57,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:57,470 INFO L225 Difference]: With dead ends: 106 [2022-03-19 08:20:57,472 INFO L226 Difference]: Without dead ends: 100 [2022-03-19 08:20:57,473 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=289, Invalid=1691, Unknown=0, NotChecked=0, Total=1980 [2022-03-19 08:20:57,473 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 63 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:57,473 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 70 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:20:57,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-19 08:20:57,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2022-03-19 08:20:57,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 79 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:57,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2022-03-19 08:20:57,547 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 33 [2022-03-19 08:20:57,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:57,547 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2022-03-19 08:20:57,548 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:20:57,548 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2022-03-19 08:20:57,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 08:20:57,548 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:57,548 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:57,564 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-19 08:20:57,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:57,763 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:57,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:57,764 INFO L85 PathProgramCache]: Analyzing trace with hash -236853986, now seen corresponding path program 14 times [2022-03-19 08:20:57,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:57,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [888197615] [2022-03-19 08:20:57,895 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:20:57,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1234226851, now seen corresponding path program 1 times [2022-03-19 08:20:57,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:57,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642277571] [2022-03-19 08:20:57,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:57,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:57,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:58,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:58,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:58,134 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:58,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:58,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642277571] [2022-03-19 08:20:58,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642277571] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:58,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787494856] [2022-03-19 08:20:58,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:58,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:58,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:58,136 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:58,137 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 08:20:58,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:58,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-19 08:20:58,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:58,429 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:58,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:59,045 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:20:59,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787494856] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:59,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:59,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 14] total 28 [2022-03-19 08:20:59,356 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:59,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [888197615] [2022-03-19 08:20:59,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [888197615] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:59,356 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:59,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:20:59,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282878978] [2022-03-19 08:20:59,357 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:59,357 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:20:59,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:59,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:20:59,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:20:59,358 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:06,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:06,761 INFO L93 Difference]: Finished difference Result 153 states and 192 transitions. [2022-03-19 08:21:06,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-19 08:21:06,761 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-19 08:21:06,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:06,762 INFO L225 Difference]: With dead ends: 153 [2022-03-19 08:21:06,762 INFO L226 Difference]: Without dead ends: 121 [2022-03-19 08:21:06,763 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=728, Invalid=4674, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:21:06,763 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 97 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:06,763 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 89 Invalid, 638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:21:06,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-19 08:21:06,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 95. [2022-03-19 08:21:06,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.2222222222222223) internal successors, (110), 90 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:06,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 114 transitions. [2022-03-19 08:21:06,821 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 114 transitions. Word has length 33 [2022-03-19 08:21:06,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:06,821 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 114 transitions. [2022-03-19 08:21:06,821 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:06,821 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 114 transitions. [2022-03-19 08:21:06,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 08:21:06,822 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:06,822 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:06,838 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:07,036 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,SelfDestructingSolverStorable31 [2022-03-19 08:21:07,037 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:07,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:07,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1645557379, now seen corresponding path program 15 times [2022-03-19 08:21:07,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:07,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2050439342] [2022-03-19 08:21:07,159 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:07,160 INFO L85 PathProgramCache]: Analyzing trace with hash 994357860, now seen corresponding path program 1 times [2022-03-19 08:21:07,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:07,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140460214] [2022-03-19 08:21:07,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:07,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:07,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:07,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:07,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:07,618 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:07,618 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:07,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140460214] [2022-03-19 08:21:07,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140460214] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:07,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097060738] [2022-03-19 08:21:07,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:07,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:07,618 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:07,622 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:07,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 08:21:07,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:07,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 08:21:07,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:08,140 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:21:08,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:08,252 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:21:08,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097060738] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:08,252 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:08,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 9] total 31 [2022-03-19 08:21:08,820 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:08,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2050439342] [2022-03-19 08:21:08,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2050439342] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:08,820 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:08,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 08:21:08,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226455181] [2022-03-19 08:21:08,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:08,821 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 08:21:08,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:08,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 08:21:08,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1081, Unknown=0, NotChecked=0, Total=1190 [2022-03-19 08:21:08,822 INFO L87 Difference]: Start difference. First operand 95 states and 114 transitions. Second operand has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:12,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:12,922 INFO L93 Difference]: Finished difference Result 131 states and 159 transitions. [2022-03-19 08:21:12,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 08:21:12,923 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 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 34 [2022-03-19 08:21:12,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:12,923 INFO L225 Difference]: With dead ends: 131 [2022-03-19 08:21:12,923 INFO L226 Difference]: Without dead ends: 121 [2022-03-19 08:21:12,924 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=439, Invalid=3221, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:21:12,925 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 61 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:12,925 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 69 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:21:12,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-03-19 08:21:12,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 95. [2022-03-19 08:21:12,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.211111111111111) internal successors, (109), 90 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:12,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2022-03-19 08:21:12,995 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 34 [2022-03-19 08:21:12,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:12,995 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2022-03-19 08:21:12,996 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.368421052631579) internal successors, (26), 18 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:12,996 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2022-03-19 08:21:12,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 08:21:12,996 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:12,996 INFO L500 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:13,013 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:13,213 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,SelfDestructingSolverStorable32 [2022-03-19 08:21:13,213 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:13,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:13,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1273237790, now seen corresponding path program 16 times [2022-03-19 08:21:13,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:13,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1073792355] [2022-03-19 08:21:13,341 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:13,342 INFO L85 PathProgramCache]: Analyzing trace with hash 1471742990, now seen corresponding path program 1 times [2022-03-19 08:21:13,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:13,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118353903] [2022-03-19 08:21:13,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:13,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:13,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:13,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:13,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:13,556 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:21:13,556 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:13,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118353903] [2022-03-19 08:21:13,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118353903] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:13,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914538466] [2022-03-19 08:21:13,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:13,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:13,557 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:13,558 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:13,559 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 08:21:13,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:13,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-19 08:21:13,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:13,706 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:21:13,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:14,044 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-03-19 08:21:14,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914538466] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:14,044 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:14,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 19 [2022-03-19 08:21:14,483 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:14,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1073792355] [2022-03-19 08:21:14,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1073792355] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:14,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:14,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:21:14,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265210281] [2022-03-19 08:21:14,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:14,484 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:21:14,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:14,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:21:14,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:21:14,485 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:16,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:16,859 INFO L93 Difference]: Finished difference Result 151 states and 183 transitions. [2022-03-19 08:21:16,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:21:16,860 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-19 08:21:16,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:16,860 INFO L225 Difference]: With dead ends: 151 [2022-03-19 08:21:16,860 INFO L226 Difference]: Without dead ends: 101 [2022-03-19 08:21:16,861 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=317, Invalid=1939, Unknown=0, NotChecked=0, Total=2256 [2022-03-19 08:21:16,861 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 49 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:16,861 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 75 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:21:16,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-19 08:21:16,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 87. [2022-03-19 08:21:16,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:16,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions. [2022-03-19 08:21:16,914 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 34 [2022-03-19 08:21:16,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:16,914 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 102 transitions. [2022-03-19 08:21:16,914 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 16 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:16,914 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions. [2022-03-19 08:21:16,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 08:21:16,914 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:16,914 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:16,931 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:17,122 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:17,122 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:17,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:17,122 INFO L85 PathProgramCache]: Analyzing trace with hash 955015874, now seen corresponding path program 8 times [2022-03-19 08:21:17,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:17,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [597705360] [2022-03-19 08:21:17,210 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:17,210 INFO L85 PathProgramCache]: Analyzing trace with hash -538073938, now seen corresponding path program 1 times [2022-03-19 08:21:17,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:17,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670181735] [2022-03-19 08:21:17,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:17,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:17,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:18,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:18,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:18,074 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:21:18,074 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:18,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670181735] [2022-03-19 08:21:18,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670181735] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:18,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327314911] [2022-03-19 08:21:18,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:18,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:18,075 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:18,076 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:18,077 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 08:21:18,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:18,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 70 conjunts are in the unsatisfiable core [2022-03-19 08:21:18,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:20,574 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:20,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:26,830 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:26,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327314911] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:26,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:26,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 24] total 61 [2022-03-19 08:21:30,280 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:30,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [597705360] [2022-03-19 08:21:30,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [597705360] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:30,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:30,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:21:30,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372281083] [2022-03-19 08:21:30,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:30,281 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:21:30,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:30,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:21:30,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=3835, Unknown=0, NotChecked=0, Total=4290 [2022-03-19 08:21:30,282 INFO L87 Difference]: Start difference. First operand 87 states and 102 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) 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) [2022-03-19 08:21:37,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:37,675 INFO L93 Difference]: Finished difference Result 107 states and 128 transitions. [2022-03-19 08:21:37,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:21:37,677 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) 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 36 [2022-03-19 08:21:37,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:37,677 INFO L225 Difference]: With dead ends: 107 [2022-03-19 08:21:37,677 INFO L226 Difference]: Without dead ends: 94 [2022-03-19 08:21:37,678 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=706, Invalid=6604, Unknown=0, NotChecked=0, Total=7310 [2022-03-19 08:21:37,679 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:37,679 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 116 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:21:37,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-19 08:21:37,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2022-03-19 08:21:37,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.2) internal successors, (102), 85 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:37,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 106 transitions. [2022-03-19 08:21:37,743 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 106 transitions. Word has length 36 [2022-03-19 08:21:37,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:37,743 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 106 transitions. [2022-03-19 08:21:37,743 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) 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) [2022-03-19 08:21:37,743 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 106 transitions. [2022-03-19 08:21:37,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 08:21:37,743 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:37,744 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:37,748 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-19 08:21:37,947 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:37,948 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:37,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:37,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1466061842, now seen corresponding path program 17 times [2022-03-19 08:21:37,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:37,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1167271925] [2022-03-19 08:21:38,076 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:38,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1390012653, now seen corresponding path program 1 times [2022-03-19 08:21:38,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:38,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706362841] [2022-03-19 08:21:38,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:38,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:38,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:38,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:38,295 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:38,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706362841] [2022-03-19 08:21:38,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706362841] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:38,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403756319] [2022-03-19 08:21:38,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:38,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:38,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:38,297 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:38,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 08:21:38,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:38,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:21:38,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:38,597 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:38,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:38,705 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:38,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403756319] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:38,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:38,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 18 [2022-03-19 08:21:39,351 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:39,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1167271925] [2022-03-19 08:21:39,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1167271925] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:39,351 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:39,351 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:21:39,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623542536] [2022-03-19 08:21:39,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:39,352 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:21:39,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:39,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:21:39,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:21:39,352 INFO L87 Difference]: Start difference. First operand 90 states and 106 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:44,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:44,952 INFO L93 Difference]: Finished difference Result 118 states and 144 transitions. [2022-03-19 08:21:44,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-19 08:21:44,954 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-19 08:21:44,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:44,955 INFO L225 Difference]: With dead ends: 118 [2022-03-19 08:21:44,955 INFO L226 Difference]: Without dead ends: 113 [2022-03-19 08:21:44,956 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=637, Invalid=3023, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:21:44,956 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 53 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:44,956 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 54 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:21:44,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-03-19 08:21:45,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 92. [2022-03-19 08:21:45,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.206896551724138) internal successors, (105), 87 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:45,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 109 transitions. [2022-03-19 08:21:45,030 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 109 transitions. Word has length 36 [2022-03-19 08:21:45,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:45,031 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 109 transitions. [2022-03-19 08:21:45,031 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:45,031 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 109 transitions. [2022-03-19 08:21:45,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:21:45,031 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:45,031 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:45,048 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-19 08:21:45,247 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:45,247 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:45,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:45,248 INFO L85 PathProgramCache]: Analyzing trace with hash -424783871, now seen corresponding path program 9 times [2022-03-19 08:21:45,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:45,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1019275184] [2022-03-19 08:21:45,368 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:45,369 INFO L85 PathProgramCache]: Analyzing trace with hash -933385195, now seen corresponding path program 1 times [2022-03-19 08:21:45,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:45,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035645738] [2022-03-19 08:21:45,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:45,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:45,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:45,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:45,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:45,653 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-19 08:21:45,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:45,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035645738] [2022-03-19 08:21:45,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035645738] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:45,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689226630] [2022-03-19 08:21:45,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:45,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:45,654 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:45,664 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:45,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 08:21:45,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:45,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-19 08:21:45,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:45,783 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-19 08:21:45,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:45,871 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-19 08:21:45,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689226630] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:45,872 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:45,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 8 [2022-03-19 08:21:46,367 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:46,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1019275184] [2022-03-19 08:21:46,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1019275184] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:46,367 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:46,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:21:46,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956037264] [2022-03-19 08:21:46,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:46,368 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:21:46,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:46,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:21:46,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-03-19 08:21:46,370 INFO L87 Difference]: Start difference. First operand 92 states and 109 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:48,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:48,625 INFO L93 Difference]: Finished difference Result 116 states and 137 transitions. [2022-03-19 08:21:48,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:21:48,626 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 08:21:48,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:48,626 INFO L225 Difference]: With dead ends: 116 [2022-03-19 08:21:48,626 INFO L226 Difference]: Without dead ends: 95 [2022-03-19 08:21:48,627 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 81 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:21:48,627 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:48,627 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 48 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:21:48,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-19 08:21:48,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 87. [2022-03-19 08:21:48,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:48,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions. [2022-03-19 08:21:48,697 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 37 [2022-03-19 08:21:48,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:48,697 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 102 transitions. [2022-03-19 08:21:48,698 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:21:48,698 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions. [2022-03-19 08:21:48,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:21:48,698 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:48,698 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:48,715 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:48,905 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,SelfDestructingSolverStorable36 [2022-03-19 08:21:48,905 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:48,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:48,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1581437808, now seen corresponding path program 18 times [2022-03-19 08:21:48,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:48,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [986400552] [2022-03-19 08:21:49,042 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:21:49,043 INFO L85 PathProgramCache]: Analyzing trace with hash -676284188, now seen corresponding path program 1 times [2022-03-19 08:21:49,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:49,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112531904] [2022-03-19 08:21:49,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:49,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:49,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:49,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:49,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:49,873 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:49,873 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:49,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112531904] [2022-03-19 08:21:49,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112531904] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:49,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049733982] [2022-03-19 08:21:49,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:49,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:49,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:49,875 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:49,876 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 08:21:49,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:49,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:21:49,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:51,092 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:21:51,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:52,019 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:21:52,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049733982] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:52,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:52,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 9] total 42 [2022-03-19 08:21:54,445 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:54,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [986400552] [2022-03-19 08:21:54,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [986400552] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:54,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:54,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:21:54,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090761341] [2022-03-19 08:21:54,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:54,446 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:21:54,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:54,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:21:54,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=2038, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 08:21:54,447 INFO L87 Difference]: Start difference. First operand 87 states and 102 transitions. Second operand has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:11,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:11,810 INFO L93 Difference]: Finished difference Result 135 states and 166 transitions. [2022-03-19 08:22:11,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-19 08:22:11,810 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 08:22:11,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:11,811 INFO L225 Difference]: With dead ends: 135 [2022-03-19 08:22:11,811 INFO L226 Difference]: Without dead ends: 124 [2022-03-19 08:22:11,812 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=565, Invalid=5915, Unknown=0, NotChecked=0, Total=6480 [2022-03-19 08:22:11,812 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 94 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:11,812 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 102 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-19 08:22:11,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-19 08:22:11,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 102. [2022-03-19 08:22:11,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.2061855670103092) internal successors, (117), 97 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:11,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 121 transitions. [2022-03-19 08:22:11,906 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 121 transitions. Word has length 37 [2022-03-19 08:22:11,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:11,906 INFO L478 AbstractCegarLoop]: Abstraction has 102 states and 121 transitions. [2022-03-19 08:22:11,906 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 22 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:11,907 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 121 transitions. [2022-03-19 08:22:11,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:22:11,907 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:11,907 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:11,924 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:12,115 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,SelfDestructingSolverStorable37 [2022-03-19 08:22:12,116 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:12,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:12,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1670686287, now seen corresponding path program 19 times [2022-03-19 08:22:12,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:12,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1530768673] [2022-03-19 08:22:12,244 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:12,244 INFO L85 PathProgramCache]: Analyzing trace with hash 692558510, now seen corresponding path program 1 times [2022-03-19 08:22:12,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:12,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467909232] [2022-03-19 08:22:12,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:12,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:12,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:12,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:12,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:12,641 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:22:12,641 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:12,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467909232] [2022-03-19 08:22:12,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467909232] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:12,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160488181] [2022-03-19 08:22:12,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:12,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:12,642 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:12,643 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:12,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 08:22:12,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:12,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:22:12,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:22:12,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:13,449 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:22:13,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160488181] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:13,450 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:13,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2022-03-19 08:22:15,336 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:15,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1530768673] [2022-03-19 08:22:15,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1530768673] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:15,336 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:15,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:22:15,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296084461] [2022-03-19 08:22:15,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:15,336 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:22:15,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:15,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:22:15,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:22:15,337 INFO L87 Difference]: Start difference. First operand 102 states and 121 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) [2022-03-19 08:22:22,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:22,742 INFO L93 Difference]: Finished difference Result 172 states and 211 transitions. [2022-03-19 08:22:22,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-19 08:22:22,743 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 37 [2022-03-19 08:22:22,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:22,744 INFO L225 Difference]: With dead ends: 172 [2022-03-19 08:22:22,744 INFO L226 Difference]: Without dead ends: 105 [2022-03-19 08:22:22,745 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=427, Invalid=2879, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 08:22:22,745 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 50 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:22,745 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 85 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:22:22,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-19 08:22:22,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 88. [2022-03-19 08:22:22,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.2048192771084338) internal successors, (100), 83 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:22,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2022-03-19 08:22:22,822 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 37 [2022-03-19 08:22:22,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:22,822 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2022-03-19 08:22:22,822 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) [2022-03-19 08:22:22,822 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2022-03-19 08:22:22,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 08:22:22,823 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:22,823 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:22,855 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:23,037 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,SelfDestructingSolverStorable38 [2022-03-19 08:22:23,037 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:23,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:23,038 INFO L85 PathProgramCache]: Analyzing trace with hash -2087930961, now seen corresponding path program 20 times [2022-03-19 08:22:23,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:23,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [827980087] [2022-03-19 08:22:23,123 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:23,124 INFO L85 PathProgramCache]: Analyzing trace with hash -594156530, now seen corresponding path program 1 times [2022-03-19 08:22:23,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:23,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604438967] [2022-03-19 08:22:23,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:23,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:23,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:23,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:23,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:23,526 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:22:23,526 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:23,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604438967] [2022-03-19 08:22:23,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604438967] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:23,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165096825] [2022-03-19 08:22:23,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:23,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:23,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:23,528 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:23,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 08:22:23,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:23,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-19 08:22:23,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:24,817 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:24,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:25,810 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:22:25,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165096825] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:25,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:25,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21, 9] total 39 [2022-03-19 08:22:28,488 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:28,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [827980087] [2022-03-19 08:22:28,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [827980087] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:28,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:28,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:22:28,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885188333] [2022-03-19 08:22:28,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:28,488 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:22:28,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:28,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:22:28,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1718, Unknown=0, NotChecked=0, Total=1892 [2022-03-19 08:22:28,489 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:44,250 INFO L93 Difference]: Finished difference Result 136 states and 173 transitions. [2022-03-19 08:22:44,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-19 08:22:44,252 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-19 08:22:44,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:44,252 INFO L225 Difference]: With dead ends: 136 [2022-03-19 08:22:44,253 INFO L226 Difference]: Without dead ends: 131 [2022-03-19 08:22:44,253 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=753, Invalid=6053, Unknown=0, NotChecked=0, Total=6806 [2022-03-19 08:22:44,253 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 66 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:44,253 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 59 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-19 08:22:44,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-03-19 08:22:44,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 104. [2022-03-19 08:22:44,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.2222222222222223) internal successors, (121), 99 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2022-03-19 08:22:44,338 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 39 [2022-03-19 08:22:44,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:44,338 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2022-03-19 08:22:44,338 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:22:44,338 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2022-03-19 08:22:44,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 08:22:44,338 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:44,338 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:44,357 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:44,555 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,SelfDestructingSolverStorable39 [2022-03-19 08:22:44,555 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:44,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:44,555 INFO L85 PathProgramCache]: Analyzing trace with hash -355872300, now seen corresponding path program 21 times [2022-03-19 08:22:44,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:44,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1843574126] [2022-03-19 08:22:44,691 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:22:44,692 INFO L85 PathProgramCache]: Analyzing trace with hash 115330453, now seen corresponding path program 1 times [2022-03-19 08:22:44,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:44,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702848473] [2022-03-19 08:22:44,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:44,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:45,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,286 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:22:45,286 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:45,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702848473] [2022-03-19 08:22:45,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702848473] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:45,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208365858] [2022-03-19 08:22:45,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:45,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:45,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:45,288 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:45,288 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 08:22:45,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:45,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:22:45,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:45,513 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:22:45,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:22:46,320 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:22:46,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208365858] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:22:46,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:22:46,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2022-03-19 08:22:49,041 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:22:49,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1843574126] [2022-03-19 08:22:49,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1843574126] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:22:49,041 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:22:49,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 08:22:49,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138843211] [2022-03-19 08:22:49,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:22:49,042 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 08:22:49,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:49,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 08:22:49,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=781, Unknown=0, NotChecked=0, Total=870 [2022-03-19 08:22:49,042 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:04,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:04,142 INFO L93 Difference]: Finished difference Result 245 states and 303 transitions. [2022-03-19 08:23:04,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-19 08:23:04,144 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-19 08:23:04,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:04,145 INFO L225 Difference]: With dead ends: 245 [2022-03-19 08:23:04,145 INFO L226 Difference]: Without dead ends: 172 [2022-03-19 08:23:04,146 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=566, Invalid=4546, Unknown=0, NotChecked=0, Total=5112 [2022-03-19 08:23:04,146 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 74 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:04,146 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 102 Invalid, 881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-03-19 08:23:04,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-03-19 08:23:04,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 119. [2022-03-19 08:23:04,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.2017543859649122) internal successors, (137), 114 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:04,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 141 transitions. [2022-03-19 08:23:04,253 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 141 transitions. Word has length 40 [2022-03-19 08:23:04,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:04,254 INFO L478 AbstractCegarLoop]: Abstraction has 119 states and 141 transitions. [2022-03-19 08:23:04,254 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:04,254 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 141 transitions. [2022-03-19 08:23:04,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 08:23:04,254 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:04,254 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:04,274 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:04,474 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:04,475 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:04,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:04,475 INFO L85 PathProgramCache]: Analyzing trace with hash -264974095, now seen corresponding path program 10 times [2022-03-19 08:23:04,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:04,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [551881501] [2022-03-19 08:23:04,609 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:04,609 INFO L85 PathProgramCache]: Analyzing trace with hash -2113325808, now seen corresponding path program 1 times [2022-03-19 08:23:04,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:04,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241902641] [2022-03-19 08:23:04,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:04,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:04,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:06,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,178 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-19 08:23:06,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:06,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241902641] [2022-03-19 08:23:06,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241902641] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:06,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378063348] [2022-03-19 08:23:06,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:06,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:06,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:06,179 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:06,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-19 08:23:06,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:06,556 WARN L261 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 91 conjunts are in the unsatisfiable core [2022-03-19 08:23:06,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:13,666 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:23:13,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:23,609 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:23:23,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378063348] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:23,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:23,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 31, 30] total 75 [2022-03-19 08:23:30,230 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:30,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [551881501] [2022-03-19 08:23:30,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [551881501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:30,231 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:30,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:23:30,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825628147] [2022-03-19 08:23:30,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:30,231 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:23:30,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:30,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:23:30,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1140, Invalid=5340, Unknown=0, NotChecked=0, Total=6480 [2022-03-19 08:23:30,232 INFO L87 Difference]: Start difference. First operand 119 states and 141 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:40,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:40,851 INFO L93 Difference]: Finished difference Result 163 states and 194 transitions. [2022-03-19 08:23:40,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:23:40,853 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-19 08:23:40,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:40,853 INFO L225 Difference]: With dead ends: 163 [2022-03-19 08:23:40,853 INFO L226 Difference]: Without dead ends: 144 [2022-03-19 08:23:40,854 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 30.9s TimeCoverageRelationStatistics Valid=1593, Invalid=9119, Unknown=0, NotChecked=0, Total=10712 [2022-03-19 08:23:40,854 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 36 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 859 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:40,854 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 118 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 859 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-03-19 08:23:40,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-03-19 08:23:40,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 103. [2022-03-19 08:23:40,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.2040816326530612) internal successors, (118), 98 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:40,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-03-19 08:23:40,968 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 41 [2022-03-19 08:23:40,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:40,969 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-03-19 08:23:40,969 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:40,969 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-03-19 08:23:40,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 08:23:40,969 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:40,969 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:40,976 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:41,174 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-03-19 08:23:41,175 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:41,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:41,175 INFO L85 PathProgramCache]: Analyzing trace with hash 410232754, now seen corresponding path program 11 times [2022-03-19 08:23:41,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:41,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [721831380] [2022-03-19 08:23:41,299 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:41,300 INFO L85 PathProgramCache]: Analyzing trace with hash -77736013, now seen corresponding path program 1 times [2022-03-19 08:23:41,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:41,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169504925] [2022-03-19 08:23:41,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:41,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:41,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:41,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,631 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 08:23:41,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:41,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169504925] [2022-03-19 08:23:41,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169504925] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:41,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247261471] [2022-03-19 08:23:41,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:41,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:41,632 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:41,652 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:41,656 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-19 08:23:41,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:41,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 08:23:41,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:41,818 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 08:23:41,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:41,949 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-19 08:23:41,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247261471] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:41,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:41,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 9 [2022-03-19 08:23:43,458 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:43,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [721831380] [2022-03-19 08:23:43,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [721831380] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:43,458 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:43,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:23:43,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330034424] [2022-03-19 08:23:43,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:43,459 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:23:43,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:43,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:23:43,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:23:43,459 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:49,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:23:49,302 INFO L93 Difference]: Finished difference Result 130 states and 154 transitions. [2022-03-19 08:23:49,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:23:49,302 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-19 08:23:49,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:23:49,304 INFO L225 Difference]: With dead ends: 130 [2022-03-19 08:23:49,319 INFO L226 Difference]: Without dead ends: 99 [2022-03-19 08:23:49,319 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=269, Invalid=1213, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:23:49,328 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:23:49,328 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 58 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:23:49,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-19 08:23:49,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 84. [2022-03-19 08:23:49,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.2278481012658229) internal successors, (97), 79 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:49,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2022-03-19 08:23:49,408 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 42 [2022-03-19 08:23:49,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:23:49,408 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2022-03-19 08:23:49,408 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:23:49,409 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2022-03-19 08:23:49,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 08:23:49,409 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:23:49,409 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:23:49,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-19 08:23:49,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:49,623 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:23:49,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:23:49,624 INFO L85 PathProgramCache]: Analyzing trace with hash -764094061, now seen corresponding path program 22 times [2022-03-19 08:23:49,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:49,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1124063460] [2022-03-19 08:23:49,755 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:23:49,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1130255969, now seen corresponding path program 1 times [2022-03-19 08:23:49,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:23:49,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484105706] [2022-03-19 08:23:49,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:49,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:23:49,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:51,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:23:51,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:51,144 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:23:51,145 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:23:51,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484105706] [2022-03-19 08:23:51,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484105706] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:23:51,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615667166] [2022-03-19 08:23:51,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:23:51,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:23:51,145 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:23:51,146 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:23:51,147 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-19 08:23:51,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:23:51,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:23:51,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:23:52,581 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:23:52,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:23:52,698 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:23:52,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615667166] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:23:52,699 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:23:52,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10, 10] total 28 [2022-03-19 08:23:59,312 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:23:59,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1124063460] [2022-03-19 08:23:59,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1124063460] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:23:59,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:23:59,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:23:59,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83105982] [2022-03-19 08:23:59,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:23:59,313 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:23:59,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:23:59,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:23:59,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1085, Unknown=0, NotChecked=0, Total=1190 [2022-03-19 08:23:59,314 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:31,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:31,785 INFO L93 Difference]: Finished difference Result 184 states and 226 transitions. [2022-03-19 08:24:31,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-19 08:24:31,787 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-19 08:24:31,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:31,787 INFO L225 Difference]: With dead ends: 184 [2022-03-19 08:24:31,788 INFO L226 Difference]: Without dead ends: 167 [2022-03-19 08:24:31,793 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1359 ImplicationChecksByTransitivity, 38.2s TimeCoverageRelationStatistics Valid=725, Invalid=5437, Unknown=0, NotChecked=0, Total=6162 [2022-03-19 08:24:31,793 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 110 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:31,794 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 97 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-03-19 08:24:31,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-03-19 08:24:31,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 108. [2022-03-19 08:24:31,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.233009708737864) internal successors, (127), 103 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:31,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 131 transitions. [2022-03-19 08:24:31,920 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 131 transitions. Word has length 42 [2022-03-19 08:24:31,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:31,921 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 131 transitions. [2022-03-19 08:24:31,921 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:31,921 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 131 transitions. [2022-03-19 08:24:31,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 08:24:31,921 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:31,921 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:31,937 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:32,137 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:32,138 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:32,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:32,138 INFO L85 PathProgramCache]: Analyzing trace with hash -774755905, now seen corresponding path program 23 times [2022-03-19 08:24:32,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:32,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1170858757] [2022-03-19 08:24:32,228 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:32,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1735486323, now seen corresponding path program 1 times [2022-03-19 08:24:32,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:32,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787540193] [2022-03-19 08:24:32,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:32,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:32,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:32,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:32,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:32,955 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:32,955 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:32,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787540193] [2022-03-19 08:24:32,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787540193] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:32,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180253637] [2022-03-19 08:24:32,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:32,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:32,955 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:32,956 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:32,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-19 08:24:33,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:33,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-19 08:24:33,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:33,673 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:33,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:33,895 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:33,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180253637] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:33,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:33,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10, 10] total 24 [2022-03-19 08:24:36,443 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:36,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1170858757] [2022-03-19 08:24:36,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1170858757] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:36,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:36,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:24:36,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743718513] [2022-03-19 08:24:36,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:36,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:24:36,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:36,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:24:36,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2022-03-19 08:24:36,444 INFO L87 Difference]: Start difference. First operand 108 states and 131 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:53,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:53,988 INFO L93 Difference]: Finished difference Result 175 states and 223 transitions. [2022-03-19 08:24:53,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-19 08:24:53,991 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-19 08:24:53,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:53,992 INFO L225 Difference]: With dead ends: 175 [2022-03-19 08:24:53,992 INFO L226 Difference]: Without dead ends: 170 [2022-03-19 08:24:53,992 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1626 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=944, Invalid=4908, Unknown=0, NotChecked=0, Total=5852 [2022-03-19 08:24:53,992 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 65 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:53,993 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 54 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-03-19 08:24:53,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-03-19 08:24:54,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 126. [2022-03-19 08:24:54,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.2396694214876034) internal successors, (150), 121 states have internal predecessors, (150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:54,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 154 transitions. [2022-03-19 08:24:54,122 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 154 transitions. Word has length 43 [2022-03-19 08:24:54,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:54,122 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 154 transitions. [2022-03-19 08:24:54,122 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:24:54,122 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 154 transitions. [2022-03-19 08:24:54,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 08:24:54,123 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:54,123 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:54,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:54,336 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-03-19 08:24:54,336 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:54,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:54,336 INFO L85 PathProgramCache]: Analyzing trace with hash -107841918, now seen corresponding path program 24 times [2022-03-19 08:24:54,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:54,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1447526613] [2022-03-19 08:24:54,428 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:24:54,428 INFO L85 PathProgramCache]: Analyzing trace with hash 602628878, now seen corresponding path program 1 times [2022-03-19 08:24:54,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:54,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145270973] [2022-03-19 08:24:54,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:54,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:54,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:55,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:55,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:55,511 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:55,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:55,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145270973] [2022-03-19 08:24:55,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145270973] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:55,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373102705] [2022-03-19 08:24:55,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:55,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:55,511 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:55,513 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:55,515 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-19 08:24:55,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:55,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-19 08:24:55,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:55,795 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:55,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:57,170 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:24:57,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373102705] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:57,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:57,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2022-03-19 08:25:02,777 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:25:02,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1447526613] [2022-03-19 08:25:02,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1447526613] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:25:02,777 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:25:02,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-19 08:25:02,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256078959] [2022-03-19 08:25:02,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:25:02,778 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-19 08:25:02,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:02,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-19 08:25:02,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1017, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:25:02,778 INFO L87 Difference]: Start difference. First operand 126 states and 154 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:31,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:25:31,850 INFO L93 Difference]: Finished difference Result 327 states and 404 transitions. [2022-03-19 08:25:31,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-19 08:25:31,853 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-19 08:25:31,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:25:31,854 INFO L225 Difference]: With dead ends: 327 [2022-03-19 08:25:31,854 INFO L226 Difference]: Without dead ends: 229 [2022-03-19 08:25:31,854 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1463 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=731, Invalid=6241, Unknown=0, NotChecked=0, Total=6972 [2022-03-19 08:25:31,854 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 81 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:25:31,855 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 109 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 939 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-03-19 08:25:31,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-03-19 08:25:32,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 143. [2022-03-19 08:25:32,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.2173913043478262) internal successors, (168), 138 states have internal predecessors, (168), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:32,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 172 transitions. [2022-03-19 08:25:32,004 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 172 transitions. Word has length 44 [2022-03-19 08:25:32,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:25:32,004 INFO L478 AbstractCegarLoop]: Abstraction has 143 states and 172 transitions. [2022-03-19 08:25:32,004 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:25:32,004 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 172 transitions. [2022-03-19 08:25:32,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-19 08:25:32,005 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:25:32,005 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:25:32,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-03-19 08:25:32,223 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-03-19 08:25:32,224 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:25:32,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:25:32,224 INFO L85 PathProgramCache]: Analyzing trace with hash 284721058, now seen corresponding path program 12 times [2022-03-19 08:25:32,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:32,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [550663350] [2022-03-19 08:25:32,359 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:25:32,359 INFO L85 PathProgramCache]: Analyzing trace with hash 1354334446, now seen corresponding path program 1 times [2022-03-19 08:25:32,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:25:32,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231084650] [2022-03-19 08:25:32,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:32,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:25:32,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:34,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:25:34,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:34,548 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:25:34,548 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:25:34,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231084650] [2022-03-19 08:25:34,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231084650] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:25:34,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349146694] [2022-03-19 08:25:34,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:34,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:25:34,549 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:25:34,550 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:25:34,551 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-19 08:25:35,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:35,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-19 08:25:35,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:25:45,250 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:25:45,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:25:59,302 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:25:59,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349146694] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:25:59,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:25:59,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 28, 34] total 78 [2022-03-19 08:26:13,896 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:26:13,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [550663350] [2022-03-19 08:26:13,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [550663350] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:26:13,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:26:13,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:26:13,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572344805] [2022-03-19 08:26:13,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:26:13,897 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:26:13,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:13,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:26:13,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1046, Invalid=6094, Unknown=0, NotChecked=0, Total=7140 [2022-03-19 08:26:13,898 INFO L87 Difference]: Start difference. First operand 143 states and 172 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:34,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:26:34,465 INFO L93 Difference]: Finished difference Result 162 states and 192 transitions. [2022-03-19 08:26:34,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:26:34,469 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 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 46 [2022-03-19 08:26:34,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:26:34,470 INFO L225 Difference]: With dead ends: 162 [2022-03-19 08:26:34,470 INFO L226 Difference]: Without dead ends: 157 [2022-03-19 08:26:34,471 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 54.0s TimeCoverageRelationStatistics Valid=1490, Invalid=10500, Unknown=0, NotChecked=0, Total=11990 [2022-03-19 08:26:34,471 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 32 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:26:34,471 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 113 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-03-19 08:26:34,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-03-19 08:26:34,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 150. [2022-03-19 08:26:34,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 145 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:34,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 180 transitions. [2022-03-19 08:26:34,633 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 180 transitions. Word has length 46 [2022-03-19 08:26:34,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:26:34,633 INFO L478 AbstractCegarLoop]: Abstraction has 150 states and 180 transitions. [2022-03-19 08:26:34,633 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 27 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:26:34,633 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 180 transitions. [2022-03-19 08:26:34,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-19 08:26:34,634 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:26:34,634 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:26:34,638 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-03-19 08:26:34,838 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-03-19 08:26:34,838 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:26:34,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:26:34,838 INFO L85 PathProgramCache]: Analyzing trace with hash 805665187, now seen corresponding path program 25 times [2022-03-19 08:26:34,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:34,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1429231874] [2022-03-19 08:26:34,956 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:26:34,956 INFO L85 PathProgramCache]: Analyzing trace with hash 167558404, now seen corresponding path program 1 times [2022-03-19 08:26:34,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:26:34,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186191615] [2022-03-19 08:26:34,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:34,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:26:34,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:38,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:26:38,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:38,158 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:26:38,158 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:26:38,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186191615] [2022-03-19 08:26:38,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186191615] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:26:38,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281319521] [2022-03-19 08:26:38,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:26:38,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:26:38,159 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:26:38,160 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:26:38,161 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-19 08:26:38,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:26:38,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:26:38,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:26:41,348 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:26:41,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:26:41,527 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 08:26:41,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281319521] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:26:41,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:26:41,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11, 11] total 32 [2022-03-19 08:26:53,887 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:26:53,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1429231874] [2022-03-19 08:26:53,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1429231874] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:26:53,887 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:26:53,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 08:26:53,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973360314] [2022-03-19 08:26:53,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:26:53,887 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 08:26:53,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:26:53,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 08:26:53,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 08:26:53,888 INFO L87 Difference]: Start difference. First operand 150 states and 180 transitions. Second operand has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:27:08,739 WARN L232 SmtUtils]: Spent 5.30s on a formula simplification. DAG size of input: 131 DAG size of output: 92 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-19 08:27:21,863 WARN L232 SmtUtils]: Spent 8.49s on a formula simplification. DAG size of input: 135 DAG size of output: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-19 08:28:18,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:28:18,181 INFO L93 Difference]: Finished difference Result 258 states and 311 transitions. [2022-03-19 08:28:18,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-19 08:28:18,183 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-19 08:28:18,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:28:18,189 INFO L225 Difference]: With dead ends: 258 [2022-03-19 08:28:18,189 INFO L226 Difference]: Without dead ends: 245 [2022-03-19 08:28:18,190 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 96.1s TimeCoverageRelationStatistics Valid=1227, Invalid=8873, Unknown=0, NotChecked=0, Total=10100 [2022-03-19 08:28:18,190 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 151 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:28:18,190 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 109 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-03-19 08:28:18,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-03-19 08:28:18,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 184. [2022-03-19 08:28:18,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.229050279329609) internal successors, (220), 179 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:18,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 224 transitions. [2022-03-19 08:28:18,413 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 224 transitions. Word has length 46 [2022-03-19 08:28:18,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:28:18,413 INFO L478 AbstractCegarLoop]: Abstraction has 184 states and 224 transitions. [2022-03-19 08:28:18,413 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:28:18,413 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 224 transitions. [2022-03-19 08:28:18,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-19 08:28:18,414 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:28:18,414 INFO L500 BasicCegarLoop]: trace histogram [10, 8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:28:18,431 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-03-19 08:28:18,630 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-03-19 08:28:18,631 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:28:18,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:28:18,631 INFO L85 PathProgramCache]: Analyzing trace with hash 2029655459, now seen corresponding path program 26 times [2022-03-19 08:28:18,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:18,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1789109391] [2022-03-19 08:28:18,770 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:28:18,771 INFO L85 PathProgramCache]: Analyzing trace with hash -924821180, now seen corresponding path program 1 times [2022-03-19 08:28:18,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:28:18,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225739403] [2022-03-19 08:28:18,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:18,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:28:18,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:20,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:28:20,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:20,785 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:28:20,785 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:28:20,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225739403] [2022-03-19 08:28:20,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225739403] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:28:20,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572682585] [2022-03-19 08:28:20,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:28:20,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:28:20,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:28:20,786 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:28:20,788 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-19 08:28:20,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:28:20,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 64 conjunts are in the unsatisfiable core [2022-03-19 08:28:20,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:28:24,819 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 08:28:24,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:28:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:28:31,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572682585] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:28:31,683 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:28:31,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 21] total 60 [2022-03-19 08:28:46,767 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:28:46,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1789109391] [2022-03-19 08:28:46,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1789109391] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:28:46,768 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:28:46,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:28:46,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143157696] [2022-03-19 08:28:46,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:28:46,768 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:28:46,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:28:46,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:28:46,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=4089, Unknown=0, NotChecked=0, Total=4422 [2022-03-19 08:28:46,769 INFO L87 Difference]: Start difference. First operand 184 states and 224 transitions. Second operand has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:14,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:29:14,997 INFO L93 Difference]: Finished difference Result 272 states and 335 transitions. [2022-03-19 08:29:15,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-19 08:29:15,000 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-19 08:29:15,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:29:15,002 INFO L225 Difference]: With dead ends: 272 [2022-03-19 08:29:15,002 INFO L226 Difference]: Without dead ends: 194 [2022-03-19 08:29:15,003 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=1002, Invalid=9098, Unknown=0, NotChecked=0, Total=10100 [2022-03-19 08:29:15,003 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 853 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:29:15,003 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 93 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 853 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-03-19 08:29:15,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-03-19 08:29:15,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 161. [2022-03-19 08:29:15,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.185897435897436) internal successors, (185), 156 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:15,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 189 transitions. [2022-03-19 08:29:15,181 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 189 transitions. Word has length 46 [2022-03-19 08:29:15,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:29:15,181 INFO L478 AbstractCegarLoop]: Abstraction has 161 states and 189 transitions. [2022-03-19 08:29:15,181 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 28 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:29:15,181 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 189 transitions. [2022-03-19 08:29:15,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 08:29:15,181 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:29:15,182 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:29:15,200 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-19 08:29:15,395 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:29:15,395 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:29:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:29:15,396 INFO L85 PathProgramCache]: Analyzing trace with hash 270913313, now seen corresponding path program 13 times [2022-03-19 08:29:15,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:15,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1091624041] [2022-03-19 08:29:15,498 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:29:15,498 INFO L85 PathProgramCache]: Analyzing trace with hash -350959595, now seen corresponding path program 1 times [2022-03-19 08:29:15,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:29:15,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014196780] [2022-03-19 08:29:15,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:15,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:29:15,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:16,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:29:16,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:16,376 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-03-19 08:29:16,376 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:29:16,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014196780] [2022-03-19 08:29:16,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014196780] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:29:16,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019645446] [2022-03-19 08:29:16,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:29:16,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:29:16,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:29:16,378 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:29:16,378 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-19 08:29:16,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:29:16,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-19 08:29:16,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:29:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:29:17,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:29:21,926 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 08:29:21,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019645446] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:29:21,926 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:29:21,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 19, 22] total 33 [2022-03-19 08:29:31,362 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:29:31,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1091624041] [2022-03-19 08:29:31,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1091624041] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:29:31,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:29:31,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:29:31,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293437236] [2022-03-19 08:29:31,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:29:31,363 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:29:31,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:29:31,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:29:31,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1366, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:29:31,363 INFO L87 Difference]: Start difference. First operand 161 states and 189 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:09,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:30:09,268 INFO L93 Difference]: Finished difference Result 200 states and 235 transitions. [2022-03-19 08:30:09,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-19 08:30:09,268 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 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 47 [2022-03-19 08:30:09,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:30:09,269 INFO L225 Difference]: With dead ends: 200 [2022-03-19 08:30:09,269 INFO L226 Difference]: Without dead ends: 187 [2022-03-19 08:30:09,269 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 76 SyntacticMatches, 5 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 49.5s TimeCoverageRelationStatistics Valid=468, Invalid=4224, Unknown=0, NotChecked=0, Total=4692 [2022-03-19 08:30:09,270 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 49 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:30:09,270 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 68 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-19 08:30:09,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-03-19 08:30:09,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 161. [2022-03-19 08:30:09,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.1794871794871795) internal successors, (184), 156 states have internal predecessors, (184), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:09,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 188 transitions. [2022-03-19 08:30:09,475 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 188 transitions. Word has length 47 [2022-03-19 08:30:09,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:30:09,475 INFO L478 AbstractCegarLoop]: Abstraction has 161 states and 188 transitions. [2022-03-19 08:30:09,475 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:30:09,475 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 188 transitions. [2022-03-19 08:30:09,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 08:30:09,476 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:30:09,476 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:30:09,493 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-19 08:30:09,683 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-19 08:30:09,684 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:30:09,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:30:09,684 INFO L85 PathProgramCache]: Analyzing trace with hash 643140527, now seen corresponding path program 27 times [2022-03-19 08:30:09,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:09,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [334419319] [2022-03-19 08:30:09,791 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:30:09,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1662634926, now seen corresponding path program 1 times [2022-03-19 08:30:09,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:30:09,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039605164] [2022-03-19 08:30:09,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:30:09,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:30:09,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:11,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:30:11,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:11,453 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-19 08:30:11,453 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:30:11,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039605164] [2022-03-19 08:30:11,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039605164] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:30:11,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668298004] [2022-03-19 08:30:11,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:30:11,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:30:11,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:30:11,454 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:30:11,455 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-19 08:30:11,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:30:11,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:30:11,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:30:14,082 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-19 08:30:14,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:30:14,594 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 64 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-03-19 08:30:14,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668298004] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:30:14,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:30:14,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11, 11] total 27 [2022-03-19 08:30:20,945 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:30:20,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [334419319] [2022-03-19 08:30:20,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [334419319] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:30:20,945 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:30:20,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:30:20,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238236052] [2022-03-19 08:30:20,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:30:20,946 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:30:20,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:30:20,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:30:20,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=923, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 08:30:20,947 INFO L87 Difference]: Start difference. First operand 161 states and 188 transitions. Second operand has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:14,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:14,114 INFO L93 Difference]: Finished difference Result 215 states and 260 transitions. [2022-03-19 08:31:14,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-03-19 08:31:14,119 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-19 08:31:14,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:14,120 INFO L225 Difference]: With dead ends: 215 [2022-03-19 08:31:14,120 INFO L226 Difference]: Without dead ends: 210 [2022-03-19 08:31:14,121 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3090 ImplicationChecksByTransitivity, 55.1s TimeCoverageRelationStatistics Valid=1518, Invalid=8784, Unknown=0, NotChecked=0, Total=10302 [2022-03-19 08:31:14,121 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 99 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 659 mSolverCounterSat, 307 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 307 IncrementalHoareTripleChecker+Valid, 659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:14,121 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 50 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [307 Valid, 659 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2022-03-19 08:31:14,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-03-19 08:31:14,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 172. [2022-03-19 08:31:14,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.1796407185628743) internal successors, (197), 167 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:14,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 201 transitions. [2022-03-19 08:31:14,335 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 201 transitions. Word has length 47 [2022-03-19 08:31:14,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:14,336 INFO L478 AbstractCegarLoop]: Abstraction has 172 states and 201 transitions. [2022-03-19 08:31:14,336 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 25 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:14,336 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 201 transitions. [2022-03-19 08:31:14,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 08:31:14,337 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:14,337 INFO L500 BasicCegarLoop]: trace histogram [10, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:14,356 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-03-19 08:31:14,541 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:14,541 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:14,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:14,542 INFO L85 PathProgramCache]: Analyzing trace with hash 1962219230, now seen corresponding path program 28 times [2022-03-19 08:31:14,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:14,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [873672074] [2022-03-19 08:31:14,686 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:31:14,687 INFO L85 PathProgramCache]: Analyzing trace with hash -106275171, now seen corresponding path program 1 times [2022-03-19 08:31:14,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:14,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684844074] [2022-03-19 08:31:14,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:14,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:14,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:16,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:16,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:16,970 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:31:16,970 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:16,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684844074] [2022-03-19 08:31:16,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684844074] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:16,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544256608] [2022-03-19 08:31:16,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:16,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:16,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:16,971 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:16,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-19 08:31:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:17,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-19 08:31:17,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:17,591 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:31:17,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:20,639 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:31:20,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544256608] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:20,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:20,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 33 [2022-03-19 08:31:33,961 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:33,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [873672074] [2022-03-19 08:31:33,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [873672074] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:33,962 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:33,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 08:31:33,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624418263] [2022-03-19 08:31:33,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:33,962 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 08:31:33,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:33,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 08:31:33,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 08:31:33,963 INFO L87 Difference]: Start difference. First operand 172 states and 201 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:33:54,387 INFO L93 Difference]: Finished difference Result 413 states and 515 transitions. [2022-03-19 08:33:54,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-03-19 08:33:54,387 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-19 08:33:54,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:33:54,396 INFO L225 Difference]: With dead ends: 413 [2022-03-19 08:33:54,396 INFO L226 Difference]: Without dead ends: 322 [2022-03-19 08:33:54,397 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 84 SyntacticMatches, 6 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8008 ImplicationChecksByTransitivity, 141.9s TimeCoverageRelationStatistics Valid=3736, Invalid=21704, Unknown=0, NotChecked=0, Total=25440 [2022-03-19 08:33:54,398 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 269 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1286 mSolverCounterSat, 615 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 1901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 615 IncrementalHoareTripleChecker+Valid, 1286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:33:54,398 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 136 Invalid, 1901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [615 Valid, 1286 Invalid, 0 Unknown, 0 Unchecked, 16.3s Time] [2022-03-19 08:33:54,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-03-19 08:33:54,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 206. [2022-03-19 08:33:54,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 201 states have (on average 1.1741293532338308) internal successors, (236), 201 states have internal predecessors, (236), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 240 transitions. [2022-03-19 08:33:54,649 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 240 transitions. Word has length 47 [2022-03-19 08:33:54,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:33:54,649 INFO L478 AbstractCegarLoop]: Abstraction has 206 states and 240 transitions. [2022-03-19 08:33:54,649 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,649 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 240 transitions. [2022-03-19 08:33:54,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 08:33:54,649 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:33:54,649 INFO L500 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:33:54,666 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-19 08:33:54,865 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-03-19 08:33:54,866 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:33:54,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:33:54,866 INFO L85 PathProgramCache]: Analyzing trace with hash 381113698, now seen corresponding path program 14 times [2022-03-19 08:33:54,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:54,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1804844813] [2022-03-19 08:33:54,986 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:33:54,986 INFO L85 PathProgramCache]: Analyzing trace with hash -921583058, now seen corresponding path program 1 times [2022-03-19 08:33:54,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:33:54,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24243514] [2022-03-19 08:33:54,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:54,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:33:55,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:33:56,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,625 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-19 08:33:56,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:33:56,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24243514] [2022-03-19 08:33:56,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24243514] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:33:56,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736831475] [2022-03-19 08:33:56,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:56,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:33:56,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:33:56,627 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:33:56,641 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-19 08:33:56,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-19 08:33:56,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:33:57,295 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-19 08:33:57,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:33:57,749 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-03-19 08:33:57,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736831475] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:33:57,749 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:33:57,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 10 [2022-03-19 08:34:02,855 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:02,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1804844813] [2022-03-19 08:34:02,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1804844813] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:02,856 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:02,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:34:02,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336474439] [2022-03-19 08:34:02,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:02,856 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:34:02,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:02,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:34:02,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2022-03-19 08:34:02,856 INFO L87 Difference]: Start difference. First operand 206 states and 240 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:12,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:34:12,259 INFO L93 Difference]: Finished difference Result 267 states and 317 transitions. [2022-03-19 08:34:12,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:34:12,259 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2022-03-19 08:34:12,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:34:12,260 INFO L225 Difference]: With dead ends: 267 [2022-03-19 08:34:12,260 INFO L226 Difference]: Without dead ends: 231 [2022-03-19 08:34:12,260 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=252, Invalid=560, Unknown=0, NotChecked=0, Total=812 [2022-03-19 08:34:12,261 INFO L912 BasicCegarLoop]: 28 mSDtfsCounter, 103 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:34:12,261 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 60 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-19 08:34:12,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-03-19 08:34:12,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 175. [2022-03-19 08:34:12,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.1764705882352942) internal successors, (200), 170 states have internal predecessors, (200), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:12,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 204 transitions. [2022-03-19 08:34:12,446 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 204 transitions. Word has length 48 [2022-03-19 08:34:12,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:34:12,446 INFO L478 AbstractCegarLoop]: Abstraction has 175 states and 204 transitions. [2022-03-19 08:34:12,446 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:12,446 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 204 transitions. [2022-03-19 08:34:12,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 08:34:12,447 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:34:12,447 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:34:12,463 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-03-19 08:34:12,652 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:12,652 INFO L403 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:34:12,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:34:12,653 INFO L85 PathProgramCache]: Analyzing trace with hash -128303869, now seen corresponding path program 29 times [2022-03-19 08:34:12,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:12,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1485152543] [2022-03-19 08:34:12,756 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:34:12,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1991101860, now seen corresponding path program 1 times [2022-03-19 08:34:12,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:34:12,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898144565] [2022-03-19 08:34:12,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:12,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:34:12,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:16,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:34:16,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:16,124 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-03-19 08:34:16,124 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:34:16,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898144565] [2022-03-19 08:34:16,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898144565] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:34:16,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147787445] [2022-03-19 08:34:16,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:16,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:16,124 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:34:16,125 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:34:16,126 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-19 08:34:16,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:16,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-19 08:34:16,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:34:20,266 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:34:20,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:34:20,585 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 10 proven. 100 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-19 08:34:20,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147787445] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:34:20,585 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:34:20,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 29 [2022-03-19 08:34:40,148 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:40,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1485152543] [2022-03-19 08:34:40,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1485152543] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:40,149 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:40,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 08:34:40,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236847394] [2022-03-19 08:34:40,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:40,149 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 08:34:40,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:40,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 08:34:40,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1207, Unknown=0, NotChecked=0, Total=1332 [2022-03-19 08:34:40,150 INFO L87 Difference]: Start difference. First operand 175 states and 204 transitions. Second operand has 24 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)