/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/loop-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 00:19:48,322 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 00:19:48,324 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 00:19:48,381 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 00:19:48,422 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 00:19:48,423 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 00:19:48,424 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 00:19:48,425 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 00:19:48,433 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 00:19:48,433 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 00:19:48,435 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 00:19:48,435 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 00:19:48,436 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 00:19:48,436 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 00:19:48,436 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 00:19:48,436 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:19:48,437 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 00:19:48,437 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 00:19:48,623 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 00:19:48,642 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 00:19:48,644 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 00:19:48,645 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 00:19:48,646 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 00:19:48,647 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2022-03-18 00:19:48,710 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc9169c0e/d922a8dfa5954b2fac9b2df53aa815ff/FLAGd4df76423 [2022-03-18 00:19:49,014 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 00:19:49,015 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2022-03-18 00:19:49,019 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc9169c0e/d922a8dfa5954b2fac9b2df53aa815ff/FLAGd4df76423 [2022-03-18 00:19:49,438 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc9169c0e/d922a8dfa5954b2fac9b2df53aa815ff [2022-03-18 00:19:49,440 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 00:19:49,440 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 00:19:49,453 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 00:19:49,453 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 00:19:49,455 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 00:19:49,456 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,456 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fbe3651 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49, skipping insertion in model container [2022-03-18 00:19:49,457 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,462 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 00:19:49,471 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 00:19:49,592 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i[893,906] [2022-03-18 00:19:49,612 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:19:49,618 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 00:19:49,626 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i[893,906] [2022-03-18 00:19:49,629 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:19:49,640 INFO L208 MainTranslator]: Completed translation [2022-03-18 00:19:49,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49 WrapperNode [2022-03-18 00:19:49,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 00:19:49,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 00:19:49,641 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 00:19:49,642 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 00:19:49,651 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,651 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,657 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,657 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,664 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,668 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 00:19:49,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 00:19:49,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 00:19:49,670 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 00:19:49,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (1/1) ... [2022-03-18 00:19:49,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:19:49,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:19:49,701 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 00:19:49,703 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 00:19:49,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 00:19:49,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 00:19:49,730 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 00:19:49,730 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 00:19:49,731 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 00:19:49,731 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 00:19:49,731 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 00:19:49,731 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 00:19:49,731 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-18 00:19:49,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-18 00:19:49,732 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 00:19:49,732 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 00:19:49,732 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 00:19:49,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 00:19:49,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 00:19:49,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 00:19:49,783 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 00:19:49,784 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 00:19:49,873 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 00:19:49,878 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 00:19:49,878 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-18 00:19:49,879 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:19:49 BoogieIcfgContainer [2022-03-18 00:19:49,879 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 00:19:49,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 00:19:49,892 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 00:19:49,894 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 00:19:49,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:19:49" (1/3) ... [2022-03-18 00:19:49,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a679ba0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:19:49, skipping insertion in model container [2022-03-18 00:19:49,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:19:49" (2/3) ... [2022-03-18 00:19:49,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a679ba0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:19:49, skipping insertion in model container [2022-03-18 00:19:49,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:19:49" (3/3) ... [2022-03-18 00:19:49,896 INFO L111 eAbstractionObserver]: Analyzing ICFG nested6.i [2022-03-18 00:19:49,899 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 00:19:49,900 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 00:19:49,934 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 00:19:49,939 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 00:19:49,939 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 00:19:49,950 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 20 states have (on average 1.55) internal successors, (31), 22 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-18 00:19:49,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-18 00:19:49,956 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:49,956 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:49,957 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:49,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:49,960 INFO L85 PathProgramCache]: Analyzing trace with hash -380972064, now seen corresponding path program 1 times [2022-03-18 00:19:49,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:49,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1138179026] [2022-03-18 00:19:49,996 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:19:49,997 INFO L85 PathProgramCache]: Analyzing trace with hash -380972064, now seen corresponding path program 2 times [2022-03-18 00:19:49,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:49,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941077752] [2022-03-18 00:19:49,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:50,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:50,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:50,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:50,225 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:50,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941077752] [2022-03-18 00:19:50,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941077752] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:19:50,228 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:50,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1138179026] [2022-03-18 00:19:50,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1138179026] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:19:50,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886138309] [2022-03-18 00:19:50,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:50,233 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 00:19:50,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:50,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 00:19:50,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 00:19:50,253 INFO L87 Difference]: Start difference. First operand has 30 states, 20 states have (on average 1.55) internal successors, (31), 22 states have internal predecessors, (31), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:50,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:50,399 INFO L93 Difference]: Finished difference Result 58 states and 81 transitions. [2022-03-18 00:19:50,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 00:19:50,403 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-18 00:19:50,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:50,410 INFO L225 Difference]: With dead ends: 58 [2022-03-18 00:19:50,410 INFO L226 Difference]: Without dead ends: 29 [2022-03-18 00:19:50,413 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 00:19:50,415 INFO L912 BasicCegarLoop]: 31 mSDtfsCounter, 39 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:50,416 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 52 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:19:50,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-18 00:19:50,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-18 00:19:50,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 00:19:50,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-03-18 00:19:50,463 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2022-03-18 00:19:50,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:50,464 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-03-18 00:19:50,464 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:50,464 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-03-18 00:19:50,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 00:19:50,465 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:50,465 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:50,465 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 00:19:50,465 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:50,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:50,466 INFO L85 PathProgramCache]: Analyzing trace with hash 580085489, now seen corresponding path program 1 times [2022-03-18 00:19:50,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:50,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1033847763] [2022-03-18 00:19:50,467 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:19:50,467 INFO L85 PathProgramCache]: Analyzing trace with hash 580085489, now seen corresponding path program 2 times [2022-03-18 00:19:50,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:50,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724542696] [2022-03-18 00:19:50,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:50,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:50,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:50,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:50,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724542696] [2022-03-18 00:19:50,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724542696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,552 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 00:19:50,552 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:50,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1033847763] [2022-03-18 00:19:50,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1033847763] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 00:19:50,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422647168] [2022-03-18 00:19:50,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:50,554 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 00:19:50,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:50,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 00:19:50,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-18 00:19:50,555 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:50,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:50,757 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2022-03-18 00:19:50,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 00:19:50,758 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-18 00:19:50,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:50,761 INFO L225 Difference]: With dead ends: 41 [2022-03-18 00:19:50,761 INFO L226 Difference]: Without dead ends: 39 [2022-03-18 00:19:50,765 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-18 00:19:50,768 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 29 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:50,772 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 45 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:19:50,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-18 00:19:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2022-03-18 00:19:50,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 00:19:50,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2022-03-18 00:19:50,782 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 17 [2022-03-18 00:19:50,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:50,783 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2022-03-18 00:19:50,783 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 00:19:50,783 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2022-03-18 00:19:50,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 00:19:50,784 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:50,784 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:50,784 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 00:19:50,784 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:50,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:50,785 INFO L85 PathProgramCache]: Analyzing trace with hash -132185391, now seen corresponding path program 1 times [2022-03-18 00:19:50,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:50,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1733321208] [2022-03-18 00:19:50,785 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:19:50,785 INFO L85 PathProgramCache]: Analyzing trace with hash -132185391, now seen corresponding path program 2 times [2022-03-18 00:19:50,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:50,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836113454] [2022-03-18 00:19:50,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:50,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:50,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:50,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-18 00:19:50,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:50,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:50,872 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:50,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836113454] [2022-03-18 00:19:50,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836113454] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:19:50,873 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:50,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1733321208] [2022-03-18 00:19:50,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1733321208] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:50,874 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:50,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:19:50,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599371419] [2022-03-18 00:19:50,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:50,875 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 00:19:50,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:50,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 00:19:50,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 00:19:50,876 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 00:19:51,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:51,008 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2022-03-18 00:19:51,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 00:19:51,009 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-03-18 00:19:51,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:51,009 INFO L225 Difference]: With dead ends: 46 [2022-03-18 00:19:51,009 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 00:19:51,011 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 00:19:51,012 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 31 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:51,012 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 42 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:19:51,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 00:19:51,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-18 00:19:51,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 32 states have internal predecessors, (37), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 00:19:51,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2022-03-18 00:19:51,023 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 21 [2022-03-18 00:19:51,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:51,023 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2022-03-18 00:19:51,023 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 00:19:51,023 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2022-03-18 00:19:51,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 00:19:51,024 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:51,024 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:51,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-18 00:19:51,024 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:51,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:51,024 INFO L85 PathProgramCache]: Analyzing trace with hash -512108736, now seen corresponding path program 1 times [2022-03-18 00:19:51,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:51,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2038692451] [2022-03-18 00:19:51,133 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:19:51,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1807414742, now seen corresponding path program 1 times [2022-03-18 00:19:51,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:51,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663002264] [2022-03-18 00:19:51,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:51,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:51,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:51,157 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:19:51,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:51,179 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:19:51,179 INFO L85 PathProgramCache]: Analyzing trace with hash -512108736, now seen corresponding path program 2 times [2022-03-18 00:19:51,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:51,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165898647] [2022-03-18 00:19:51,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:51,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:51,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:51,232 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:51,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:51,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-18 00:19:51,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:51,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:19:51,242 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:51,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165898647] [2022-03-18 00:19:51,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165898647] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:19:51,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972118887] [2022-03-18 00:19:51,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:19:51,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:51,243 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:19:51,244 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:19:51,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 00:19:51,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:19:51,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:19:51,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 00:19:51,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:19:51,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 00:19:51,454 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 00:19:51,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972118887] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:51,454 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 00:19:51,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-03-18 00:19:51,455 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:51,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2038692451] [2022-03-18 00:19:51,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2038692451] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:51,455 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:51,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 00:19:51,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13677155] [2022-03-18 00:19:51,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:51,455 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 00:19:51,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:51,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 00:19:51,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-18 00:19:51,456 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 00:19:51,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:51,527 INFO L93 Difference]: Finished difference Result 107 states and 137 transitions. [2022-03-18 00:19:51,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 00:19:51,529 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-03-18 00:19:51,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:51,530 INFO L225 Difference]: With dead ends: 107 [2022-03-18 00:19:51,530 INFO L226 Difference]: Without dead ends: 72 [2022-03-18 00:19:51,531 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-03-18 00:19:51,531 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 23 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:51,532 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 98 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:19:51,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-18 00:19:51,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 48. [2022-03-18 00:19:51,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 00:19:51,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2022-03-18 00:19:51,549 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 25 [2022-03-18 00:19:51,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:51,549 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2022-03-18 00:19:51,549 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 00:19:51,550 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2022-03-18 00:19:51,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-18 00:19:51,550 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:51,550 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:51,567 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-18 00:19:51,757 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:51,757 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:51,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:51,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1758799342, now seen corresponding path program 1 times [2022-03-18 00:19:51,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:51,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [142897760] [2022-03-18 00:19:51,805 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Could not compute Simultaneous Update! [2022-03-18 00:19:52,023 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:19:52,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1528322538, now seen corresponding path program 1 times [2022-03-18 00:19:52,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:52,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181974079] [2022-03-18 00:19:52,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:52,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:52,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:52,035 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:19:52,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:19:52,047 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:19:52,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1758799342, now seen corresponding path program 2 times [2022-03-18 00:19:52,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:52,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025482100] [2022-03-18 00:19:52,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:52,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:52,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:52,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:52,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:52,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2022-03-18 00:19:52,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:52,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 00:19:52,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:52,160 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 00:19:52,160 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:52,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025482100] [2022-03-18 00:19:52,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025482100] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:19:52,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761497449] [2022-03-18 00:19:52,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:19:52,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:52,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:19:52,162 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:19:52,164 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 00:19:52,206 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:19:52,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:19:52,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 00:19:52,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:19:52,287 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 00:19:52,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:19:52,344 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 00:19:52,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761497449] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:19:52,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:19:52,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 14 [2022-03-18 00:19:52,347 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:19:52,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [142897760] [2022-03-18 00:19:52,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [142897760] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:19:52,357 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:19:52,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-18 00:19:52,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907091168] [2022-03-18 00:19:52,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:19:52,360 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 00:19:52,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:52,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 00:19:52,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-18 00:19:52,361 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 00:19:52,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:19:52,581 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2022-03-18 00:19:52,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 00:19:52,581 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2022-03-18 00:19:52,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:19:52,582 INFO L225 Difference]: With dead ends: 100 [2022-03-18 00:19:52,582 INFO L226 Difference]: Without dead ends: 76 [2022-03-18 00:19:52,583 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2022-03-18 00:19:52,583 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 50 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:19:52,584 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 51 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:19:52,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-18 00:19:52,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 56. [2022-03-18 00:19:52,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.25) internal successors, (50), 43 states have internal predecessors, (50), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-18 00:19:52,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2022-03-18 00:19:52,623 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 32 [2022-03-18 00:19:52,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:19:52,623 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2022-03-18 00:19:52,623 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 00:19:52,623 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2022-03-18 00:19:52,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 00:19:52,627 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:19:52,627 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:19:52,649 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-18 00:19:52,843 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,SelfDestructingSolverStorable6,SelfDestructingSolverStorable5 [2022-03-18 00:19:52,844 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:19:52,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:19:52,844 INFO L85 PathProgramCache]: Analyzing trace with hash 747584238, now seen corresponding path program 1 times [2022-03-18 00:19:52,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:19:52,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1563071680] [2022-03-18 00:19:59,869 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Basisvector must contain only constants! [2022-03-18 00:19:59,870 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-18 00:19:59,870 INFO L85 PathProgramCache]: Analyzing trace with hash 747584238, now seen corresponding path program 2 times [2022-03-18 00:19:59,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:19:59,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891325724] [2022-03-18 00:19:59,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:19:59,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:19:59,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:59,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:19:59,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:59,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2022-03-18 00:19:59,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:59,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2022-03-18 00:19:59,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:19:59,955 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 00:19:59,955 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:19:59,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891325724] [2022-03-18 00:19:59,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891325724] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:19:59,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128867964] [2022-03-18 00:19:59,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:19:59,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:19:59,956 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:19:59,957 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 00:19:59,988 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 00:20:00,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:20:00,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:20:00,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 00:20:00,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:20:00,191 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 00:20:00,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:20:00,284 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 00:20:00,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128867964] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:20:00,284 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:20:00,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 19 [2022-03-18 00:20:00,285 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:20:00,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1563071680] [2022-03-18 00:20:00,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1563071680] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:20:00,285 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:20:00,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 00:20:00,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943867856] [2022-03-18 00:20:00,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:20:00,285 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 00:20:00,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:00,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 00:20:00,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2022-03-18 00:20:00,286 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 00:20:00,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:20:00,615 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2022-03-18 00:20:00,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 00:20:00,616 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2022-03-18 00:20:00,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:20:00,620 INFO L225 Difference]: With dead ends: 117 [2022-03-18 00:20:00,620 INFO L226 Difference]: Without dead ends: 70 [2022-03-18 00:20:00,621 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2022-03-18 00:20:00,623 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 63 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:20:00,623 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 49 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:20:00,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-18 00:20:00,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 60. [2022-03-18 00:20:00,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 43 states have (on average 1.255813953488372) internal successors, (54), 46 states have internal predecessors, (54), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-18 00:20:00,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 75 transitions. [2022-03-18 00:20:00,646 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 75 transitions. Word has length 39 [2022-03-18 00:20:00,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:20:00,648 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 75 transitions. [2022-03-18 00:20:00,648 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 00:20:00,648 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 75 transitions. [2022-03-18 00:20:00,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-18 00:20:00,652 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:20:00,653 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:20:00,680 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 00:20:00,877 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:20:00,878 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:20:00,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:20:00,878 INFO L85 PathProgramCache]: Analyzing trace with hash 980226149, now seen corresponding path program 1 times [2022-03-18 00:20:00,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:00,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1898956642] [2022-03-18 00:20:01,087 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Basisvector must contain only constants! [2022-03-18 00:20:01,087 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-18 00:20:01,088 INFO L85 PathProgramCache]: Analyzing trace with hash 980226149, now seen corresponding path program 2 times [2022-03-18 00:20:01,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:20:01,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410013212] [2022-03-18 00:20:01,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:20:01,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:20:01,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:01,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:20:01,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:01,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-18 00:20:01,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:01,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-18 00:20:01,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:01,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2022-03-18 00:20:01,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:20:01,212 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-03-18 00:20:01,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:20:01,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410013212] [2022-03-18 00:20:01,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410013212] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:20:01,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263246092] [2022-03-18 00:20:01,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:20:01,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:20:01,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:20:01,214 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) [2022-03-18 00:20:01,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 00:20:01,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:20:01,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:20:01,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 00:20:01,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:20:01,396 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-18 00:20:01,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:20:01,496 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-03-18 00:20:01,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263246092] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:20:01,497 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:20:01,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 16 [2022-03-18 00:20:01,497 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:20:01,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1898956642] [2022-03-18 00:20:01,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1898956642] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:20:01,498 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:20:01,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 00:20:01,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886937796] [2022-03-18 00:20:01,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:20:01,498 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 00:20:01,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:01,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 00:20:01,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-18 00:20:01,499 INFO L87 Difference]: Start difference. First operand 60 states and 75 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-18 00:20:01,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:20:01,701 INFO L93 Difference]: Finished difference Result 115 states and 147 transitions. [2022-03-18 00:20:01,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 00:20:01,702 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 41 [2022-03-18 00:20:01,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:20:01,703 INFO L225 Difference]: With dead ends: 115 [2022-03-18 00:20:01,703 INFO L226 Difference]: Without dead ends: 77 [2022-03-18 00:20:01,704 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2022-03-18 00:20:01,704 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 75 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:20:01,704 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 39 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:20:01,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-18 00:20:01,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 68. [2022-03-18 00:20:01,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 48 states have (on average 1.25) internal successors, (60), 52 states have internal predecessors, (60), 14 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-18 00:20:01,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 87 transitions. [2022-03-18 00:20:01,717 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 87 transitions. Word has length 41 [2022-03-18 00:20:01,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:20:01,718 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 87 transitions. [2022-03-18 00:20:01,718 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-03-18 00:20:01,718 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 87 transitions. [2022-03-18 00:20:01,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-18 00:20:01,719 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:20:01,719 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:20:01,743 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 00:20:01,931 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:20:01,932 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:20:01,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:20:01,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1415669004, now seen corresponding path program 1 times [2022-03-18 00:20:01,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:20:01,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1483234981] [2022-03-18 00:20:01,938 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.ClassCastException: class de.uni_freiburg.informatik.ultimate.logic.ConstantTerm cannot be cast to class de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm (de.uni_freiburg.informatik.ultimate.logic.ConstantTerm and de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm are in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @5987e932) at de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrAbstractor.appTermToReal(QvasrAbstractor.java:1285) at de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrAbstractor.getUpdates(QvasrAbstractor.java:1246) at de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrAbstractor.computeAbstraction(QvasrAbstractor.java:106) at de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrSummarizer.summarizeLoop(QvasrSummarizer.java:129) at de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrLoopSummarization.getQvasrAcceleration(QvasrLoopSummarization.java:87) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.loopaccelerator.AcceleratorQvasr.accelerateLoop(AcceleratorQvasr.java:91) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolationCore.acceleratedInterpolationCoreIsCorrect(AcceleratedInterpolationCore.java:246) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleAcceleratedInterpolation.construct(IpTcStrategyModuleAcceleratedInterpolation.java:80) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:209) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:121) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:596) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:414) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:349) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:331) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:414) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:264) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:177) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:156) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-03-18 00:20:01,945 INFO L158 Benchmark]: Toolchain (without parser) took 12504.22ms. Allocated memory was 186.6MB in the beginning and 224.4MB in the end (delta: 37.7MB). Free memory was 140.4MB in the beginning and 100.6MB in the end (delta: 39.8MB). Peak memory consumption was 77.3MB. Max. memory is 8.0GB. [2022-03-18 00:20:01,945 INFO L158 Benchmark]: CDTParser took 0.13ms. Allocated memory is still 186.6MB. Free memory is still 156.3MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-18 00:20:01,945 INFO L158 Benchmark]: CACSL2BoogieTranslator took 187.80ms. Allocated memory is still 186.6MB. Free memory was 140.2MB in the beginning and 166.0MB in the end (delta: -25.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-03-18 00:20:01,945 INFO L158 Benchmark]: Boogie Preprocessor took 28.67ms. Allocated memory is still 186.6MB. Free memory was 166.0MB in the beginning and 164.3MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-18 00:20:01,946 INFO L158 Benchmark]: RCFGBuilder took 209.23ms. Allocated memory is still 186.6MB. Free memory was 164.3MB in the beginning and 153.4MB in the end (delta: 10.9MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-03-18 00:20:01,946 INFO L158 Benchmark]: TraceAbstraction took 12053.01ms. Allocated memory was 186.6MB in the beginning and 224.4MB in the end (delta: 37.7MB). Free memory was 152.9MB in the beginning and 100.6MB in the end (delta: 52.3MB). Peak memory consumption was 91.1MB. Max. memory is 8.0GB. [2022-03-18 00:20:01,947 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13ms. Allocated memory is still 186.6MB. Free memory is still 156.3MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 187.80ms. Allocated memory is still 186.6MB. Free memory was 140.2MB in the beginning and 166.0MB in the end (delta: -25.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 28.67ms. Allocated memory is still 186.6MB. Free memory was 166.0MB in the beginning and 164.3MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 209.23ms. Allocated memory is still 186.6MB. Free memory was 164.3MB in the beginning and 153.4MB in the end (delta: 10.9MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 12053.01ms. Allocated memory was 186.6MB in the beginning and 224.4MB in the end (delta: 37.7MB). Free memory was 152.9MB in the beginning and 100.6MB in the end (delta: 52.3MB). Peak memory consumption was 91.1MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: ClassCastException: class de.uni_freiburg.informatik.ultimate.logic.ConstantTerm cannot be cast to class de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm (de.uni_freiburg.informatik.ultimate.logic.ConstantTerm and de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm are in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @5987e932) de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: ClassCastException: class de.uni_freiburg.informatik.ultimate.logic.ConstantTerm cannot be cast to class de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm (de.uni_freiburg.informatik.ultimate.logic.ConstantTerm and de.uni_freiburg.informatik.ultimate.logic.ApplicationTerm are in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @5987e932): de.uni_freiburg.informatik.ultimate.icfgtransformer.loopacceleration.qvasr.QvasrAbstractor.appTermToReal(QvasrAbstractor.java:1285) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-03-18 00:20:01,964 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...