/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/cohendiv-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 20:04:04,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 20:04:04,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 20:04:04,355 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 20:04:04,368 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 20:04:04,369 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 20:04:04,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 20:04:04,372 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 20:04:04,373 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 20:04:04,373 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 20:04:04,375 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 20:04:04,379 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 20:04:04,381 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 20:04:04,382 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 20:04:04,382 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 20:04:04,383 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 20:04:04,384 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 20:04:04,389 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-20 20:04:04,395 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 20:04:04,395 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 20:04:04,397 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 20:04:04,397 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 20:04:04,404 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 20:04:04,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 20:04:04,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 20:04:04,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 20:04:04,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 20:04:04,406 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 20:04:04,407 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 20:04:04,407 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 20:04:04,407 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 20:04:04,407 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 20:04:04,407 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 20:04:04,408 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:04:04,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 20:04:04,408 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 20:04:04,409 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 20:04:04,594 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 20:04:04,610 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 20:04:04,611 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 20:04:04,612 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 20:04:04,612 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 20:04:04,613 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c [2022-03-20 20:04:04,667 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7c6cb39/3586a5122aa94555ada73d59863fb2d2/FLAG58ec9951c [2022-03-20 20:04:04,976 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 20:04:04,976 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c [2022-03-20 20:04:04,981 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7c6cb39/3586a5122aa94555ada73d59863fb2d2/FLAG58ec9951c [2022-03-20 20:04:05,414 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d7c6cb39/3586a5122aa94555ada73d59863fb2d2 [2022-03-20 20:04:05,416 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 20:04:05,417 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 20:04:05,423 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 20:04:05,423 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 20:04:05,426 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 20:04:05,427 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,430 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@447d25a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05, skipping insertion in model container [2022-03-20 20:04:05,430 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,434 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 20:04:05,443 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 20:04:05,544 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/cohendiv-ll_unwindbound20.c[576,589] [2022-03-20 20:04:05,558 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:04:05,563 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 20:04:05,570 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/cohendiv-ll_unwindbound20.c[576,589] [2022-03-20 20:04:05,575 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:04:05,583 INFO L208 MainTranslator]: Completed translation [2022-03-20 20:04:05,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05 WrapperNode [2022-03-20 20:04:05,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 20:04:05,584 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 20:04:05,584 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 20:04:05,584 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 20:04:05,591 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,595 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,595 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,601 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 20:04:05,603 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 20:04:05,603 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 20:04:05,604 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 20:04:05,604 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (1/1) ... [2022-03-20 20:04:05,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:04:05,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:04:05,625 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 20:04:05,631 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 20:04:05,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 20:04:05,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 20:04:05,668 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 20:04:05,669 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 20:04:05,669 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 20:04:05,669 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 20:04:05,669 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 20:04:05,669 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 20:04:05,669 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 20:04:05,669 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 20:04:05,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 20:04:05,670 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 20:04:05,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 20:04:05,670 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 20:04:05,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 20:04:05,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 20:04:05,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 20:04:05,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 20:04:05,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 20:04:05,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 20:04:05,724 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 20:04:05,725 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 20:04:05,884 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 20:04:05,889 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 20:04:05,889 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 20:04:05,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:04:05 BoogieIcfgContainer [2022-03-20 20:04:05,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 20:04:05,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 20:04:05,891 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 20:04:05,913 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 20:04:05,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 08:04:05" (1/3) ... [2022-03-20 20:04:05,914 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@234f3528 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:04:05, skipping insertion in model container [2022-03-20 20:04:05,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:04:05" (2/3) ... [2022-03-20 20:04:05,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@234f3528 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:04:05, skipping insertion in model container [2022-03-20 20:04:05,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:04:05" (3/3) ... [2022-03-20 20:04:05,916 INFO L111 eAbstractionObserver]: Analyzing ICFG cohendiv-ll_unwindbound20.c [2022-03-20 20:04:05,919 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 20:04:05,919 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 20:04:05,968 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 20:04:05,974 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 20:04:05,975 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 20:04:05,990 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 20:04:06,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 20:04:06,004 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:06,005 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:04:06,005 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:06,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:06,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1588022502, now seen corresponding path program 1 times [2022-03-20 20:04:06,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1775874674] [2022-03-20 20:04:06,024 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:04:06,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1588022502, now seen corresponding path program 2 times [2022-03-20 20:04:06,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:04:06,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089272210] [2022-03-20 20:04:06,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:04:06,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:04:06,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:04:06,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 20:04:06,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:04:06,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 20:04:06,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:04:06,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 20:04:06,201 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:04:06,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089272210] [2022-03-20 20:04:06,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089272210] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:04:06,205 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:04:06,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1775874674] [2022-03-20 20:04:06,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1775874674] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,206 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:04:06,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020547614] [2022-03-20 20:04:06,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:04:06,211 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 20:04:06,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 20:04:06,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 20:04:06,235 INFO L87 Difference]: Start difference. First operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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) [2022-03-20 20:04:06,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:04:06,343 INFO L93 Difference]: Finished difference Result 68 states and 101 transitions. [2022-03-20 20:04:06,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 20:04:06,345 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 [2022-03-20 20:04:06,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:04:06,353 INFO L225 Difference]: With dead ends: 68 [2022-03-20 20:04:06,354 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 20:04:06,357 INFO L912 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 [2022-03-20 20:04:06,360 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:04:06,362 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:04:06,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 20:04:06,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-03-20 20:04:06,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 20:04:06,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2022-03-20 20:04:06,402 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 17 [2022-03-20 20:04:06,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:04:06,403 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2022-03-20 20:04:06,403 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) [2022-03-20 20:04:06,403 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2022-03-20 20:04:06,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 20:04:06,404 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:06,404 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:04:06,405 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 20:04:06,405 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:06,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:06,407 INFO L85 PathProgramCache]: Analyzing trace with hash 766070672, now seen corresponding path program 1 times [2022-03-20 20:04:06,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1832943836] [2022-03-20 20:04:06,414 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:04:06,414 INFO L85 PathProgramCache]: Analyzing trace with hash 766070672, now seen corresponding path program 2 times [2022-03-20 20:04:06,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:04:06,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036550513] [2022-03-20 20:04:06,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:04:06,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:04:06,439 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:04:06,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654196011] [2022-03-20 20:04:06,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:04:06,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:06,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:04:06,444 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:04:06,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 20:04:06,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 20:04:06,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:04:06,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 20:04:06,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:04:06,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 20:04:06,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:04:06,576 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:04:06,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036550513] [2022-03-20 20:04:06,576 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:04:06,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654196011] [2022-03-20 20:04:06,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654196011] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,578 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 20:04:06,578 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:04:06,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1832943836] [2022-03-20 20:04:06,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1832943836] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,579 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 20:04:06,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795464255] [2022-03-20 20:04:06,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:04:06,580 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 20:04:06,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 20:04:06,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 20:04:06,581 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 20:04:06,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:04:06,601 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-20 20:04:06,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 20:04:06,601 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2022-03-20 20:04:06,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:04:06,602 INFO L225 Difference]: With dead ends: 42 [2022-03-20 20:04:06,602 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 20:04:06,603 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 20:04:06,604 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:04:06,604 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:04:06,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 20:04:06,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 20:04:06,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 20:04:06,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2022-03-20 20:04:06,610 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 18 [2022-03-20 20:04:06,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:04:06,611 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2022-03-20 20:04:06,611 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 20:04:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2022-03-20 20:04:06,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 20:04:06,611 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:06,611 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:04:06,628 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-20 20:04:06,824 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:06,825 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:06,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:06,825 INFO L85 PathProgramCache]: Analyzing trace with hash 767560222, now seen corresponding path program 1 times [2022-03-20 20:04:06,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [151384846] [2022-03-20 20:04:06,826 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:04:06,826 INFO L85 PathProgramCache]: Analyzing trace with hash 767560222, now seen corresponding path program 2 times [2022-03-20 20:04:06,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:04:06,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429706772] [2022-03-20 20:04:06,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:04:06,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:04:06,843 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:04:06,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [541249454] [2022-03-20 20:04:06,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:04:06,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:06,844 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:04:06,847 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:04:06,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 20:04:06,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 20:04:06,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:04:06,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:04:06,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:04:06,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 20:04:06,971 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:04:06,971 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:04:06,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429706772] [2022-03-20 20:04:06,971 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:04:06,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541249454] [2022-03-20 20:04:06,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541249454] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,971 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:06,972 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:04:06,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [151384846] [2022-03-20 20:04:06,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [151384846] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:06,972 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:06,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:06,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207408833] [2022-03-20 20:04:06,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:04:06,973 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:04:06,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:06,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:04:06,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:04:06,973 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 20:04:07,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:04:07,014 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2022-03-20 20:04:07,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:04:07,015 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 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 18 [2022-03-20 20:04:07,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:04:07,016 INFO L225 Difference]: With dead ends: 45 [2022-03-20 20:04:07,016 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 20:04:07,016 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:04:07,017 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:04:07,018 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 149 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:04:07,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 20:04:07,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-03-20 20:04:07,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 20:04:07,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2022-03-20 20:04:07,025 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 18 [2022-03-20 20:04:07,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:04:07,025 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2022-03-20 20:04:07,026 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 20:04:07,026 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2022-03-20 20:04:07,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 20:04:07,026 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:07,026 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:04:07,043 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 20:04:07,227 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,SelfDestructingSolverStorable2 [2022-03-20 20:04:07,227 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:07,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:07,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1016228092, now seen corresponding path program 1 times [2022-03-20 20:04:07,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:07,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [798397167] [2022-03-20 20:04:07,228 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:04:07,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1016228092, now seen corresponding path program 2 times [2022-03-20 20:04:07,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:04:07,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963787631] [2022-03-20 20:04:07,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:04:07,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:04:07,237 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:04:07,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [221992075] [2022-03-20 20:04:07,238 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:04:07,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:07,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:04:07,239 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:04:07,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 20:04:07,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:04:07,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:04:07,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:04:07,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:04:07,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 20:04:07,351 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:04:07,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:04:07,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963787631] [2022-03-20 20:04:07,351 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:04:07,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221992075] [2022-03-20 20:04:07,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221992075] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:07,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:07,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:07,352 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:04:07,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [798397167] [2022-03-20 20:04:07,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [798397167] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:07,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:07,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:07,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188321638] [2022-03-20 20:04:07,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:04:07,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:04:07,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:07,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:04:07,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:04:07,354 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-03-20 20:04:07,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:04:07,395 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2022-03-20 20:04:07,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:04:07,395 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 23 [2022-03-20 20:04:07,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:04:07,396 INFO L225 Difference]: With dead ends: 58 [2022-03-20 20:04:07,396 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 20:04:07,397 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:04:07,397 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 13 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:04:07,398 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 149 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:04:07,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 20:04:07,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2022-03-20 20:04:07,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 20:04:07,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2022-03-20 20:04:07,406 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 23 [2022-03-20 20:04:07,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:04:07,406 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2022-03-20 20:04:07,406 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-03-20 20:04:07,406 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2022-03-20 20:04:07,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 20:04:07,407 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:07,407 INFO L499 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, 1, 1, 1, 1] [2022-03-20 20:04:07,425 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 20:04:07,625 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:07,626 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:07,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:07,627 INFO L85 PathProgramCache]: Analyzing trace with hash 2019703110, now seen corresponding path program 1 times [2022-03-20 20:04:07,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:07,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1490678064] [2022-03-20 20:04:07,627 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:04:07,627 INFO L85 PathProgramCache]: Analyzing trace with hash 2019703110, now seen corresponding path program 2 times [2022-03-20 20:04:07,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:04:07,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836718147] [2022-03-20 20:04:07,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:04:07,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:04:07,642 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:04:07,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [648019847] [2022-03-20 20:04:07,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:04:07,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:07,643 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:04:07,645 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:04:07,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 20:04:07,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:04:07,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:04:07,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:04:07,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:04:07,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:04:07,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:04:07,750 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:04:07,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836718147] [2022-03-20 20:04:07,751 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:04:07,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648019847] [2022-03-20 20:04:07,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648019847] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:07,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:07,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:07,751 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:04:07,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1490678064] [2022-03-20 20:04:07,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1490678064] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:04:07,752 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:04:07,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:04:07,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570489004] [2022-03-20 20:04:07,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:04:07,752 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:04:07,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:07,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:04:07,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:04:07,753 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 20:04:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:04:07,799 INFO L93 Difference]: Finished difference Result 83 states and 113 transitions. [2022-03-20 20:04:07,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:04:07,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 31 [2022-03-20 20:04:07,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:04:07,800 INFO L225 Difference]: With dead ends: 83 [2022-03-20 20:04:07,801 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 20:04:07,801 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:04:07,801 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 13 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:04:07,802 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 160 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:04:07,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 20:04:07,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-03-20 20:04:07,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 46 states have internal predecessors, (56), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 20:04:07,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 100 transitions. [2022-03-20 20:04:07,812 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 100 transitions. Word has length 31 [2022-03-20 20:04:07,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:04:07,812 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 100 transitions. [2022-03-20 20:04:07,812 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 20:04:07,812 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 100 transitions. [2022-03-20 20:04:07,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 20:04:07,813 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:04:07,813 INFO L499 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2022-03-20 20:04:07,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 20:04:08,019 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:04:08,020 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:04:08,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:04:08,020 INFO L85 PathProgramCache]: Analyzing trace with hash 202176206, now seen corresponding path program 1 times [2022-03-20 20:04:08,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:04:08,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [897457741] [2022-03-20 20:13:53,040 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 20:13:53,041 INFO L85 PathProgramCache]: Analyzing trace with hash -1923851590, now seen corresponding path program 1 times [2022-03-20 20:13:53,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:13:53,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953053433] [2022-03-20 20:13:53,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:13:53,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:13:53,055 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:13:53,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1001378720] [2022-03-20 20:13:53,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:13:53,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:13:53,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:13:53,064 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:13:53,065 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 20:13:53,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:13:53,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 20:13:53,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:13:53,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 20:13:53,138 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:13:53,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:13:53,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953053433] [2022-03-20 20:13:53,139 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:13:53,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001378720] [2022-03-20 20:13:53,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001378720] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:13:53,139 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:13:53,139 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 20:13:53,212 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 20:13:53,455 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:13:53,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [897457741] [2022-03-20 20:13:53,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [897457741] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:13:53,455 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:13:53,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 20:13:53,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339980791] [2022-03-20 20:13:53,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:13:53,456 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 20:13:53,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:13:53,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 20:13:53,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-03-20 20:13:53,457 INFO L87 Difference]: Start difference. First operand 74 states and 100 transitions. Second operand has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 20:13:55,503 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 20:13:57,532 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 20:13:59,567 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 20:13:59,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:13:59,644 INFO L93 Difference]: Finished difference Result 113 states and 153 transitions. [2022-03-20 20:13:59,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 20:13:59,645 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2022-03-20 20:13:59,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:13:59,647 INFO L225 Difference]: With dead ends: 113 [2022-03-20 20:13:59,647 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 20:13:59,647 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2022-03-20 20:13:59,648 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 19 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:13:59,648 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 263 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 193 Invalid, 3 Unknown, 0 Unchecked, 6.1s Time] [2022-03-20 20:13:59,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 20:13:59,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-03-20 20:13:59,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 49 states have internal predecessors, (58), 23 states have call successors, (23), 8 states have call predecessors, (23), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 20:13:59,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2022-03-20 20:13:59,656 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 34 [2022-03-20 20:13:59,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:13:59,656 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2022-03-20 20:13:59,656 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-20 20:13:59,657 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2022-03-20 20:13:59,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 20:13:59,657 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:13:59,657 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:13:59,677 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 20:13:59,858 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:13:59,858 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:13:59,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:13:59,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1813008070, now seen corresponding path program 1 times [2022-03-20 20:13:59,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:13:59,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1730363365] [2022-03-20 20:13:59,859 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:13:59,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1813008070, now seen corresponding path program 2 times [2022-03-20 20:13:59,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:13:59,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323943071] [2022-03-20 20:13:59,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:13:59,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:13:59,867 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:13:59,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [647906113] [2022-03-20 20:13:59,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:13:59,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:13:59,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:13:59,870 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:13:59,871 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 20:13:59,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:13:59,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:13:59,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:13:59,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:14:00,007 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 20:14:00,007 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:14:00,007 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:14:00,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323943071] [2022-03-20 20:14:00,008 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:14:00,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647906113] [2022-03-20 20:14:00,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647906113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:14:00,008 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:14:00,008 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:14:00,008 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:14:00,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1730363365] [2022-03-20 20:14:00,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1730363365] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:14:00,008 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:14:00,008 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:14:00,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353952637] [2022-03-20 20:14:00,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:14:00,009 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:14:00,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:14:00,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:14:00,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 20:14:00,009 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 20:14:00,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:14:00,079 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2022-03-20 20:14:00,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:14:00,080 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), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2022-03-20 20:14:00,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:14:00,081 INFO L225 Difference]: With dead ends: 84 [2022-03-20 20:14:00,081 INFO L226 Difference]: Without dead ends: 82 [2022-03-20 20:14:00,081 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-20 20:14:00,081 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 20 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 20:14:00,082 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 203 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 20:14:00,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-20 20:14:00,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-03-20 20:14:00,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 50 states have (on average 1.22) internal successors, (61), 52 states have internal predecessors, (61), 23 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 20:14:00,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 105 transitions. [2022-03-20 20:14:00,090 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 105 transitions. Word has length 41 [2022-03-20 20:14:00,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:14:00,091 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 105 transitions. [2022-03-20 20:14:00,091 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), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 20:14:00,091 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 105 transitions. [2022-03-20 20:14:00,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 20:14:00,092 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:14:00,092 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:14:00,117 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-20 20:14:00,303 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:14:00,304 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:14:00,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:14:00,304 INFO L85 PathProgramCache]: Analyzing trace with hash -683043127, now seen corresponding path program 1 times [2022-03-20 20:14:00,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:14:00,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1161918172] [2022-03-20 20:14:00,305 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:14:00,305 INFO L85 PathProgramCache]: Analyzing trace with hash -683043127, now seen corresponding path program 2 times [2022-03-20 20:14:00,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:14:00,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576159385] [2022-03-20 20:14:00,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:14:00,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:14:00,311 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:14:00,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1594367683] [2022-03-20 20:14:00,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:14:00,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:14:00,312 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:14:00,323 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 20:14:00,324 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 20:14:00,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:14:00,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:14:00,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:14:00,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:14:00,451 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:14:00,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 20:14:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-20 20:14:00,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:14:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576159385] [2022-03-20 20:14:00,572 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:14:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594367683] [2022-03-20 20:14:00,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594367683] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 20:14:00,572 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 20:14:00,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-20 20:14:00,572 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:14:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1161918172] [2022-03-20 20:14:00,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1161918172] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:14:00,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:14:00,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 20:14:00,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348083535] [2022-03-20 20:14:00,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:14:00,573 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 20:14:00,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:14:00,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 20:14:00,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-03-20 20:14:00,573 INFO L87 Difference]: Start difference. First operand 82 states and 105 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:14:00,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:14:00,656 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-03-20 20:14:00,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:14:00,657 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2022-03-20 20:14:00,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:14:00,657 INFO L225 Difference]: With dead ends: 88 [2022-03-20 20:14:00,657 INFO L226 Difference]: Without dead ends: 86 [2022-03-20 20:14:00,658 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-03-20 20:14:00,658 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 21 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 20:14:00,658 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 155 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 20:14:00,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-20 20:14:00,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-03-20 20:14:00,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 20:14:00,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2022-03-20 20:14:00,668 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 47 [2022-03-20 20:14:00,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:14:00,668 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2022-03-20 20:14:00,669 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 20:14:00,669 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2022-03-20 20:14:00,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 20:14:00,669 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:14:00,670 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:14:00,686 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 20:14:00,886 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:14:00,886 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:14:00,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:14:00,887 INFO L85 PathProgramCache]: Analyzing trace with hash -589126939, now seen corresponding path program 1 times [2022-03-20 20:14:00,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:14:00,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1987555519]