/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/nla-digbench-scaling/cohencu-ll_valuebound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 01:41:58,462 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 01:41:58,464 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 01:41:58,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 01:41:58,558 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 01:41:58,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 01:41:58,560 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 01:41:58,561 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 01:41:58,571 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 01:41:58,572 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 01:41:58,573 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 01:41:58,574 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 01:41:58,579 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 01:41:58,579 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 01:41:58,579 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 01:41:58,579 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 01:41:58,579 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:41:58,580 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 01:41:58,580 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 01:41:58,580 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 01:41:58,810 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 01:41:58,828 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 01:41:58,830 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 01:41:58,831 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 01:41:58,831 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 01:41:58,832 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound10.c [2022-03-18 01:41:58,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88fb91a3d/fdf340ecb82443b9af4f73dd85ac62d2/FLAG4ddc2f965 [2022-03-18 01:41:59,466 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 01:41:59,467 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound10.c [2022-03-18 01:41:59,472 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88fb91a3d/fdf340ecb82443b9af4f73dd85ac62d2/FLAG4ddc2f965 [2022-03-18 01:41:59,855 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/88fb91a3d/fdf340ecb82443b9af4f73dd85ac62d2 [2022-03-18 01:41:59,857 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 01:41:59,858 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 01:41:59,863 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 01:41:59,863 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 01:41:59,866 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 01:41:59,867 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:41:59" (1/1) ... [2022-03-18 01:41:59,868 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ef8b613 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:41:59, skipping insertion in model container [2022-03-18 01:41:59,868 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:41:59" (1/1) ... [2022-03-18 01:41:59,875 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 01:41:59,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 01:42:00,023 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound10.c[588,601] [2022-03-18 01:42:00,041 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:42:00,047 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 01:42:00,055 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound10.c[588,601] [2022-03-18 01:42:00,064 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:42:00,073 INFO L208 MainTranslator]: Completed translation [2022-03-18 01:42:00,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00 WrapperNode [2022-03-18 01:42:00,074 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 01:42:00,075 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 01:42:00,075 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 01:42:00,075 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 01:42:00,083 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,083 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,089 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,089 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,093 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,095 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,096 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,098 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 01:42:00,098 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 01:42:00,099 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 01:42:00,099 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 01:42:00,099 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (1/1) ... [2022-03-18 01:42:00,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:42:00,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:42:00,125 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) [2022-03-18 01:42:00,136 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 [2022-03-18 01:42:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 01:42:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 01:42:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 01:42:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 01:42:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 01:42:00,162 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ushort [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 01:42:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 01:42:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 01:42:00,213 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 01:42:00,214 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 01:42:00,385 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 01:42:00,390 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 01:42:00,390 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 01:42:00,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:42:00 BoogieIcfgContainer [2022-03-18 01:42:00,392 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 01:42:00,393 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 01:42:00,393 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 01:42:00,412 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 01:42:00,412 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 01:41:59" (1/3) ... [2022-03-18 01:42:00,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c084943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:42:00, skipping insertion in model container [2022-03-18 01:42:00,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:42:00" (2/3) ... [2022-03-18 01:42:00,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c084943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:42:00, skipping insertion in model container [2022-03-18 01:42:00,414 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:42:00" (3/3) ... [2022-03-18 01:42:00,415 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_valuebound10.c [2022-03-18 01:42:00,419 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 01:42:00,419 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 01:42:00,498 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 01:42:00,503 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 [2022-03-18 01:42:00,503 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 01:42:00,540 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 01:42:00,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 01:42:00,547 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:00,548 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:42:00,548 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:00,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:00,552 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 1 times [2022-03-18 01:42:00,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:00,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1968135724] [2022-03-18 01:42:00,569 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:42:00,569 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 2 times [2022-03-18 01:42:00,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:42:00,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731471698] [2022-03-18 01:42:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:42:00,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:42:00,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:00,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:42:00,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:00,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 01:42:00,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:00,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:42:00,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:42:00,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731471698] [2022-03-18 01:42:00,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731471698] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:00,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:00,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:42:00,777 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:42:00,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1968135724] [2022-03-18 01:42:00,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1968135724] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:00,777 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:00,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:42:00,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530368508] [2022-03-18 01:42:00,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:42:00,781 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 01:42:00,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:00,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 01:42:00,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 01:42:00,806 INFO L87 Difference]: Start difference. First operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:42:00,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:42:00,937 INFO L93 Difference]: Finished difference Result 63 states and 101 transitions. [2022-03-18 01:42:00,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 01:42:00,939 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-18 01:42:00,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:42:00,946 INFO L225 Difference]: With dead ends: 63 [2022-03-18 01:42:00,946 INFO L226 Difference]: Without dead ends: 31 [2022-03-18 01:42:00,951 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 01:42:00,956 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:42:00,957 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 37 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:42:00,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-18 01:42:00,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-18 01:42:00,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 01:42:01,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-03-18 01:42:01,005 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 17 [2022-03-18 01:42:01,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:42:01,005 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-03-18 01:42:01,006 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:42:01,006 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-03-18 01:42:01,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 01:42:01,006 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:01,007 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:42:01,007 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 01:42:01,007 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:01,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:01,009 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 1 times [2022-03-18 01:42:01,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:01,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1853990269] [2022-03-18 01:42:01,019 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:42:01,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 2 times [2022-03-18 01:42:01,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:42:01,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456899557] [2022-03-18 01:42:01,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:42:01,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:42:01,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:01,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:42:01,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:01,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 01:42:01,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:42:01,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:42:01,184 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:42:01,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456899557] [2022-03-18 01:42:01,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456899557] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:01,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:01,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:42:01,185 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:42:01,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1853990269] [2022-03-18 01:42:01,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1853990269] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:01,186 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:01,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:42:01,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385497260] [2022-03-18 01:42:01,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:42:01,187 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 01:42:01,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:01,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 01:42:01,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:42:01,189 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:42:01,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:42:01,332 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2022-03-18 01:42:01,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 01:42:01,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-18 01:42:01,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:42:01,334 INFO L225 Difference]: With dead ends: 37 [2022-03-18 01:42:01,334 INFO L226 Difference]: Without dead ends: 35 [2022-03-18 01:42:01,335 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 01:42:01,336 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 22 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:42:01,336 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 43 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:42:01,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-18 01:42:01,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-18 01:42:01,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 01:42:01,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2022-03-18 01:42:01,347 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 17 [2022-03-18 01:42:01,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:42:01,348 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2022-03-18 01:42:01,348 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:42:01,348 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2022-03-18 01:42:01,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 01:42:01,349 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:01,349 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] [2022-03-18 01:42:01,349 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 01:42:01,349 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:01,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:01,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 1 times [2022-03-18 01:42:01,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:01,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [672535784] [2022-03-18 01:42:01,350 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:42:01,351 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 2 times [2022-03-18 01:42:01,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:42:01,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925513263] [2022-03-18 01:42:01,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:42:01,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:42:01,362 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:42:01,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [60106939] [2022-03-18 01:42:01,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:42:01,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:42:01,363 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:42:01,367 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) [2022-03-18 01:42:01,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 01:42:01,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:42:01,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:42:01,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 01:42:01,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:42:01,560 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:42:01,560 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:42:01,561 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:42:01,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925513263] [2022-03-18 01:42:01,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:42:01,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60106939] [2022-03-18 01:42:01,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60106939] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:01,562 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:01,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:01,563 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:42:01,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [672535784] [2022-03-18 01:42:01,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [672535784] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:01,564 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:01,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:01,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404928735] [2022-03-18 01:42:01,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:42:01,565 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:42:01,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:01,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:42:01,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:42:01,566 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 01:42:01,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:42:01,625 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2022-03-18 01:42:01,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:42:01,626 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2022-03-18 01:42:01,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:42:01,627 INFO L225 Difference]: With dead ends: 54 [2022-03-18 01:42:01,627 INFO L226 Difference]: Without dead ends: 52 [2022-03-18 01:42:01,628 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:42:01,629 INFO L912 BasicCegarLoop]: 49 mSDtfsCounter, 6 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:42:01,629 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 168 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:42:01,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-18 01:42:01,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2022-03-18 01:42:01,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.1) internal successors, (22), 22 states have internal predecessors, (22), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 01:42:01,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-03-18 01:42:01,641 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 22 [2022-03-18 01:42:01,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:42:01,642 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-03-18 01:42:01,642 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 01:42:01,642 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-03-18 01:42:01,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 01:42:01,643 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:01,643 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, 1, 1, 1] [2022-03-18 01:42:01,668 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 01:42:01,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:42:01,864 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:01,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:01,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 1 times [2022-03-18 01:42:01,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:01,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1794873287] [2022-03-18 01:42:01,865 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:42:01,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 2 times [2022-03-18 01:42:01,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:42:01,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613229564] [2022-03-18 01:42:01,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:42:01,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:42:01,878 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:42:01,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1143022803] [2022-03-18 01:42:01,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:42:01,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:42:01,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:42:01,888 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) [2022-03-18 01:42:01,890 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 01:42:01,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:42:01,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:42:01,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 01:42:01,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:42:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 01:42:02,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:42:02,018 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:42:02,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613229564] [2022-03-18 01:42:02,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:42:02,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143022803] [2022-03-18 01:42:02,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143022803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:02,019 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:02,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:02,019 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:42:02,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1794873287] [2022-03-18 01:42:02,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1794873287] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:02,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:02,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:02,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815997538] [2022-03-18 01:42:02,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:42:02,020 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:42:02,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:02,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:42:02,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:42:02,021 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 01:42:02,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:42:02,080 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2022-03-18 01:42:02,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:42:02,083 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2022-03-18 01:42:02,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:42:02,085 INFO L225 Difference]: With dead ends: 58 [2022-03-18 01:42:02,085 INFO L226 Difference]: Without dead ends: 56 [2022-03-18 01:42:02,085 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:42:02,086 INFO L912 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:42:02,086 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 165 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:42:02,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-18 01:42:02,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2022-03-18 01:42:02,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 24 states have (on average 1.125) internal successors, (27), 26 states have internal predecessors, (27), 21 states have call successors, (21), 7 states have call predecessors, (21), 6 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-18 01:42:02,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-03-18 01:42:02,099 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 27 [2022-03-18 01:42:02,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:42:02,100 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-03-18 01:42:02,100 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 01:42:02,100 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-03-18 01:42:02,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-18 01:42:02,101 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:02,101 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:42:02,127 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 01:42:02,324 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,SelfDestructingSolverStorable3 [2022-03-18 01:42:02,324 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:02,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:02,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 1 times [2022-03-18 01:42:02,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:02,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [915035751] [2022-03-18 01:42:02,326 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:42:02,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 2 times [2022-03-18 01:42:02,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:42:02,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825983760] [2022-03-18 01:42:02,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:42:02,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:42:02,345 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:42:02,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [429594118] [2022-03-18 01:42:02,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:42:02,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:42:02,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:42:02,353 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) [2022-03-18 01:42:02,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 01:42:02,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:42:02,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:42:02,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 01:42:02,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:42:02,523 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 01:42:02,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:42:02,524 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:42:02,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825983760] [2022-03-18 01:42:02,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:42:02,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429594118] [2022-03-18 01:42:02,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429594118] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:02,525 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:02,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:02,525 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:42:02,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [915035751] [2022-03-18 01:42:02,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [915035751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:42:02,525 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:42:02,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:42:02,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802704289] [2022-03-18 01:42:02,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:42:02,526 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:42:02,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:02,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:42:02,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:42:02,527 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 01:42:02,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:42:02,625 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2022-03-18 01:42:02,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:42:02,626 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-03-18 01:42:02,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:42:02,627 INFO L225 Difference]: With dead ends: 66 [2022-03-18 01:42:02,627 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 01:42:02,627 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:42:02,628 INFO L912 BasicCegarLoop]: 45 mSDtfsCounter, 6 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:42:02,629 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 157 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:42:02,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 01:42:02,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-18 01:42:02,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 19 states have call successors, (19), 8 states have call predecessors, (19), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 01:42:02,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-03-18 01:42:02,643 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 32 [2022-03-18 01:42:02,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:42:02,643 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-03-18 01:42:02,643 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 01:42:02,643 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-03-18 01:42:02,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-18 01:42:02,644 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:42:02,644 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:42:02,671 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 01:42:02,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:42:02,864 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:42:02,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:42:02,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1002403483, now seen corresponding path program 1 times [2022-03-18 01:42:02,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:42:02,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1722480183]