/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:30:47,077 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:30:47,079 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:30:47,117 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:30:47,159 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:30:47,159 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:30:47,159 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:30:47,160 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-01-31 21:30:47,170 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:30:47,170 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:30:47,171 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:30:47,171 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:30:47,172 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:30:47,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:30:47,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:30:47,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:30:47,174 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:30:47,174 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:30:47,174 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:30:47,359 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:30:47,379 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:30:47,381 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:30:47,382 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:30:47,382 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:30:47,383 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c [2022-01-31 21:30:47,422 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b8f8f93d/5fdffbe1ec0d4e3585c513a4fe5736c6/FLAGfccbdd8c0 [2022-01-31 21:30:47,759 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:30:47,759 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c [2022-01-31 21:30:47,763 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b8f8f93d/5fdffbe1ec0d4e3585c513a4fe5736c6/FLAGfccbdd8c0 [2022-01-31 21:30:48,165 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b8f8f93d/5fdffbe1ec0d4e3585c513a4fe5736c6 [2022-01-31 21:30:48,166 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:30:48,167 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:30:48,168 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:30:48,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:30:48,171 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:30:48,171 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,172 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14892395 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48, skipping insertion in model container [2022-01-31 21:30:48,172 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,176 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:30:48,184 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:30:48,311 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-01-31 21:30:48,336 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:30:48,341 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:30:48,351 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-01-31 21:30:48,361 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:30:48,372 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:30:48,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48 WrapperNode [2022-01-31 21:30:48,372 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:30:48,373 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:30:48,373 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:30:48,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:30:48,381 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,395 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,400 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,403 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,405 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:30:48,406 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:30:48,406 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:30:48,406 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:30:48,407 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (1/1) ... [2022-01-31 21:30:48,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:30:48,423 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:30:48,460 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) [2022-01-31 21:30:48,471 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 [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:30:48,494 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-01-31 21:30:48,495 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 21:30:48,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:30:48,496 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:30:48,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:30:48,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:30:48,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:30:48,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:30:48,497 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:30:48,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:30:48,544 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:30:48,545 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:30:48,665 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:30:48,670 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:30:48,670 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-31 21:30:48,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:30:48 BoogieIcfgContainer [2022-01-31 21:30:48,671 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:30:48,672 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:30:48,672 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:30:48,697 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:30:48,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:30:48" (1/3) ... [2022-01-31 21:30:48,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bb41cc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:30:48, skipping insertion in model container [2022-01-31 21:30:48,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:30:48" (2/3) ... [2022-01-31 21:30:48,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bb41cc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:30:48, skipping insertion in model container [2022-01-31 21:30:48,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:30:48" (3/3) ... [2022-01-31 21:30:48,699 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2022-01-31 21:30:48,702 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:30:48,702 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:30:48,749 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:30:48,757 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, 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, mLoopAccelerationTechnique=JORDAN [2022-01-31 21:30:48,757 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:30:48,771 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-31 21:30:48,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-01-31 21:30:48,781 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:48,781 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:48,782 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:48,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:48,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1039138334, now seen corresponding path program 1 times [2022-01-31 21:30:48,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:48,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830227356] [2022-01-31 21:30:48,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:48,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:48,838 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:30:48,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:48,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:48,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:48,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:48,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:48,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:48,960 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:48,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830227356] [2022-01-31 21:30:48,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [830227356] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:48,961 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:48,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:30:48,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298266812] [2022-01-31 21:30:48,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:48,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:30:48,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:48,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:30:48,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:30:48,983 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:49,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:49,024 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2022-01-31 21:30:49,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:30:49,026 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2022-01-31 21:30:49,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:49,035 INFO L225 Difference]: With dead ends: 50 [2022-01-31 21:30:49,035 INFO L226 Difference]: Without dead ends: 27 [2022-01-31 21:30:49,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:30:49,040 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:49,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 35 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:30:49,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-31 21:30:49,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-01-31 21:30:49,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:30:49,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-01-31 21:30:49,072 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2022-01-31 21:30:49,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:49,072 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-01-31 21:30:49,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-01-31 21:30:49,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-01-31 21:30:49,074 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:49,074 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:49,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:30:49,075 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:49,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:49,076 INFO L85 PathProgramCache]: Analyzing trace with hash 677978447, now seen corresponding path program 1 times [2022-01-31 21:30:49,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:49,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374857209] [2022-01-31 21:30:49,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:49,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:49,086 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:30:49,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:49,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:49,208 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:49,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374857209] [2022-01-31 21:30:49,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [374857209] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:49,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:49,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 21:30:49,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810250275] [2022-01-31 21:30:49,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:49,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 21:30:49,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:49,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 21:30:49,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-01-31 21:30:49,210 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:49,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:49,293 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-01-31 21:30:49,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 21:30:49,293 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-01-31 21:30:49,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:49,294 INFO L225 Difference]: With dead ends: 46 [2022-01-31 21:30:49,294 INFO L226 Difference]: Without dead ends: 31 [2022-01-31 21:30:49,294 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-01-31 21:30:49,295 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 39 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:49,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 25 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:30:49,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-01-31 21:30:49,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-01-31 21:30:49,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:30:49,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-01-31 21:30:49,302 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2022-01-31 21:30:49,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:49,302 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-01-31 21:30:49,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:49,303 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-01-31 21:30:49,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-01-31 21:30:49,303 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:49,303 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:49,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:30:49,303 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:49,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:49,304 INFO L85 PathProgramCache]: Analyzing trace with hash -673447056, now seen corresponding path program 1 times [2022-01-31 21:30:49,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:49,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919600073] [2022-01-31 21:30:49,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:49,452 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:49,452 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:49,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:49,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,504 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:49,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:49,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:49,554 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:49,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919600073] [2022-01-31 21:30:49,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1919600073] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:49,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:49,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-01-31 21:30:49,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319739456] [2022-01-31 21:30:49,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:49,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-31 21:30:49,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:49,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-31 21:30:49,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:30:49,556 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:49,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:49,649 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2022-01-31 21:30:49,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:30:49,649 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-01-31 21:30:49,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:49,652 INFO L225 Difference]: With dead ends: 59 [2022-01-31 21:30:49,652 INFO L226 Difference]: Without dead ends: 43 [2022-01-31 21:30:49,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2022-01-31 21:30:49,658 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:49,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 43 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:49,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-01-31 21:30:49,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2022-01-31 21:30:49,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:30:49,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2022-01-31 21:30:49,691 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 24 [2022-01-31 21:30:49,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:49,691 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2022-01-31 21:30:49,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:49,691 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2022-01-31 21:30:49,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-01-31 21:30:49,693 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:49,693 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:49,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:30:49,693 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:49,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:49,694 INFO L85 PathProgramCache]: Analyzing trace with hash 708533296, now seen corresponding path program 1 times [2022-01-31 21:30:49,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:49,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144992682] [2022-01-31 21:30:49,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:49,787 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:49,787 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:49,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:49,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,834 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:49,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:49,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:49,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:49,888 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:49,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144992682] [2022-01-31 21:30:49,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1144992682] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:49,889 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:49,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-01-31 21:30:49,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082329302] [2022-01-31 21:30:49,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:49,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-31 21:30:49,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:49,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-31 21:30:49,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:30:49,892 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:50,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:50,007 INFO L93 Difference]: Finished difference Result 64 states and 85 transitions. [2022-01-31 21:30:50,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:30:50,008 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-01-31 21:30:50,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:50,009 INFO L225 Difference]: With dead ends: 64 [2022-01-31 21:30:50,009 INFO L226 Difference]: Without dead ends: 41 [2022-01-31 21:30:50,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-01-31 21:30:50,010 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 20 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:50,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 55 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:50,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-01-31 21:30:50,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2022-01-31 21:30:50,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:30:50,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-01-31 21:30:50,017 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 24 [2022-01-31 21:30:50,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:50,017 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-01-31 21:30:50,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-01-31 21:30:50,018 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-01-31 21:30:50,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:30:50,039 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:50,039 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:50,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:30:50,039 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:50,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:50,040 INFO L85 PathProgramCache]: Analyzing trace with hash -2061972965, now seen corresponding path program 1 times [2022-01-31 21:30:50,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:50,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260654317] [2022-01-31 21:30:50,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:50,094 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:50,094 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:50,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:50,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:50,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:50,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:50,192 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:50,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260654317] [2022-01-31 21:30:50,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1260654317] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:50,193 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:50,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:30:50,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325476280] [2022-01-31 21:30:50,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:50,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:30:50,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:50,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:30:50,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:30:50,194 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:50,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:50,350 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2022-01-31 21:30:50,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:30:50,350 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-01-31 21:30:50,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:50,351 INFO L225 Difference]: With dead ends: 77 [2022-01-31 21:30:50,351 INFO L226 Difference]: Without dead ends: 55 [2022-01-31 21:30:50,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:30:50,352 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 72 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:50,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 31 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:50,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-01-31 21:30:50,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2022-01-31 21:30:50,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 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) [2022-01-31 21:30:50,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-01-31 21:30:50,361 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 25 [2022-01-31 21:30:50,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:50,361 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-01-31 21:30:50,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:50,362 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-01-31 21:30:50,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:30:50,362 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:50,363 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:50,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:30:50,363 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:50,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:50,363 INFO L85 PathProgramCache]: Analyzing trace with hash -2060125923, now seen corresponding path program 1 times [2022-01-31 21:30:50,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:50,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526071219] [2022-01-31 21:30:50,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:50,410 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:50,410 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:50,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:50,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:50,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:50,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:50,540 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:50,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526071219] [2022-01-31 21:30:50,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [526071219] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:50,540 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:50,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:30:50,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778450170] [2022-01-31 21:30:50,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:50,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:30:50,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:50,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:30:50,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-01-31 21:30:50,541 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:50,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:50,689 INFO L93 Difference]: Finished difference Result 113 states and 146 transitions. [2022-01-31 21:30:50,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:30:50,690 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-01-31 21:30:50,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:50,691 INFO L225 Difference]: With dead ends: 113 [2022-01-31 21:30:50,691 INFO L226 Difference]: Without dead ends: 75 [2022-01-31 21:30:50,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:30:50,691 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:50,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 28 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:50,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-01-31 21:30:50,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 60. [2022-01-31 21:30:50,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 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) [2022-01-31 21:30:50,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2022-01-31 21:30:50,701 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 25 [2022-01-31 21:30:50,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:50,701 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2022-01-31 21:30:50,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:50,701 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2022-01-31 21:30:50,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:30:50,702 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:50,702 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:50,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:30:50,702 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:50,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:50,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1425494747, now seen corresponding path program 1 times [2022-01-31 21:30:50,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:50,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493472573] [2022-01-31 21:30:50,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:50,743 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:50,743 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:50,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:50,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:50,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:50,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:50,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:50,953 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:50,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493472573] [2022-01-31 21:30:50,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [493472573] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:50,953 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:50,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:30:50,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605918055] [2022-01-31 21:30:50,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:50,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:30:50,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:50,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:30:50,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:30:50,954 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:51,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:51,211 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-01-31 21:30:51,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:30:51,211 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-01-31 21:30:51,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:51,212 INFO L225 Difference]: With dead ends: 88 [2022-01-31 21:30:51,212 INFO L226 Difference]: Without dead ends: 86 [2022-01-31 21:30:51,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:30:51,213 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 57 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:51,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 52 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:51,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-01-31 21:30:51,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 75. [2022-01-31 21:30:51,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 64 states have (on average 1.28125) internal successors, (82), 65 states have internal predecessors, (82), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-01-31 21:30:51,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 93 transitions. [2022-01-31 21:30:51,224 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 93 transitions. Word has length 25 [2022-01-31 21:30:51,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:51,225 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 93 transitions. [2022-01-31 21:30:51,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:51,225 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 93 transitions. [2022-01-31 21:30:51,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:30:51,225 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:51,225 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:51,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:30:51,226 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:51,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:51,226 INFO L85 PathProgramCache]: Analyzing trace with hash 2067453981, now seen corresponding path program 1 times [2022-01-31 21:30:51,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:51,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522669766] [2022-01-31 21:30:51,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:51,275 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,275 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:51,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:51,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:51,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:51,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:51,343 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:51,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522669766] [2022-01-31 21:30:51,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1522669766] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:51,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:51,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:30:51,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704791332] [2022-01-31 21:30:51,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:51,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:30:51,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:51,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:30:51,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:30:51,344 INFO L87 Difference]: Start difference. First operand 75 states and 93 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:51,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:51,492 INFO L93 Difference]: Finished difference Result 127 states and 163 transitions. [2022-01-31 21:30:51,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-31 21:30:51,492 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-01-31 21:30:51,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:51,494 INFO L225 Difference]: With dead ends: 127 [2022-01-31 21:30:51,494 INFO L226 Difference]: Without dead ends: 100 [2022-01-31 21:30:51,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:30:51,495 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 72 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:51,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 47 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:51,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-01-31 21:30:51,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2022-01-31 21:30:51,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 85 states have internal predecessors, (109), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-01-31 21:30:51,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 122 transitions. [2022-01-31 21:30:51,509 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 122 transitions. Word has length 25 [2022-01-31 21:30:51,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:51,509 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 122 transitions. [2022-01-31 21:30:51,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:51,509 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 122 transitions. [2022-01-31 21:30:51,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:30:51,510 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:51,510 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:51,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:30:51,510 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:51,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:51,510 INFO L85 PathProgramCache]: Analyzing trace with hash 2069301023, now seen corresponding path program 1 times [2022-01-31 21:30:51,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:51,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708900856] [2022-01-31 21:30:51,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:51,561 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,561 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:51,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:51,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:51,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:51,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:51,855 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:51,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708900856] [2022-01-31 21:30:51,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [708900856] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:51,856 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:51,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:30:51,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840763421] [2022-01-31 21:30:51,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:51,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:30:51,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:51,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:30:51,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:30:51,857 INFO L87 Difference]: Start difference. First operand 96 states and 122 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:52,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:52,148 INFO L93 Difference]: Finished difference Result 121 states and 153 transitions. [2022-01-31 21:30:52,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:30:52,148 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-01-31 21:30:52,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:52,149 INFO L225 Difference]: With dead ends: 121 [2022-01-31 21:30:52,149 INFO L226 Difference]: Without dead ends: 119 [2022-01-31 21:30:52,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:30:52,150 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 60 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:52,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 60 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:30:52,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-01-31 21:30:52,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 110. [2022-01-31 21:30:52,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 95 states have (on average 1.2947368421052632) internal successors, (123), 98 states have internal predecessors, (123), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:52,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 140 transitions. [2022-01-31 21:30:52,187 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 140 transitions. Word has length 25 [2022-01-31 21:30:52,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:52,187 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 140 transitions. [2022-01-31 21:30:52,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:52,187 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 140 transitions. [2022-01-31 21:30:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-01-31 21:30:52,188 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:52,188 INFO L514 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, 1, 1, 1] [2022-01-31 21:30:52,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:30:52,188 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:52,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:52,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1643345404, now seen corresponding path program 1 times [2022-01-31 21:30:52,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:52,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918127580] [2022-01-31 21:30:52,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:52,225 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:52,226 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:52,260 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:52,306 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:52,306 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:52,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:52,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:52,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:52,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:52,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:52,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:52,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:52,616 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:52,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918127580] [2022-01-31 21:30:52,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1918127580] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:52,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:52,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:30:52,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666797134] [2022-01-31 21:30:52,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:52,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:30:52,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:52,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:30:52,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:30:52,618 INFO L87 Difference]: Start difference. First operand 110 states and 140 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:52,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:52,841 INFO L93 Difference]: Finished difference Result 202 states and 263 transitions. [2022-01-31 21:30:52,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:30:52,842 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-01-31 21:30:52,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:52,842 INFO L225 Difference]: With dead ends: 202 [2022-01-31 21:30:52,843 INFO L226 Difference]: Without dead ends: 122 [2022-01-31 21:30:52,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:30:52,844 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:52,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 64 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:52,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-01-31 21:30:52,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 115. [2022-01-31 21:30:52,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 100 states have (on average 1.29) internal successors, (129), 103 states have internal predecessors, (129), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:52,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 146 transitions. [2022-01-31 21:30:52,856 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 146 transitions. Word has length 28 [2022-01-31 21:30:52,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:52,856 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 146 transitions. [2022-01-31 21:30:52,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 14 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:52,856 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 146 transitions. [2022-01-31 21:30:52,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-01-31 21:30:52,857 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:52,857 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:52,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:30:52,857 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:52,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:52,858 INFO L85 PathProgramCache]: Analyzing trace with hash -646101633, now seen corresponding path program 2 times [2022-01-31 21:30:52,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:52,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128094141] [2022-01-31 21:30:52,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:52,922 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:52,968 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:52,968 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:53,005 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:53,054 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:53,054 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:53,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:53,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:53,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:53,508 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:53,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128094141] [2022-01-31 21:30:53,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2128094141] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:53,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:53,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:30:53,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977064485] [2022-01-31 21:30:53,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:53,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:30:53,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:53,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:30:53,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:30:53,510 INFO L87 Difference]: Start difference. First operand 115 states and 146 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:53,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:53,737 INFO L93 Difference]: Finished difference Result 194 states and 252 transitions. [2022-01-31 21:30:53,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-01-31 21:30:53,737 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-01-31 21:30:53,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:53,738 INFO L225 Difference]: With dead ends: 194 [2022-01-31 21:30:53,738 INFO L226 Difference]: Without dead ends: 125 [2022-01-31 21:30:53,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:30:53,739 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:53,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 58 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:53,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-01-31 21:30:53,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 118. [2022-01-31 21:30:53,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 103 states have (on average 1.2815533980582525) internal successors, (132), 106 states have internal predecessors, (132), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:53,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 149 transitions. [2022-01-31 21:30:53,752 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 149 transitions. Word has length 31 [2022-01-31 21:30:53,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:53,752 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 149 transitions. [2022-01-31 21:30:53,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 15 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:53,752 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 149 transitions. [2022-01-31 21:30:53,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-01-31 21:30:53,754 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:53,754 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:53,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:30:53,754 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:53,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:53,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1657218883, now seen corresponding path program 3 times [2022-01-31 21:30:53,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:53,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010276575] [2022-01-31 21:30:53,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:53,796 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:53,796 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:53,831 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:53,874 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:53,874 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:53,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:53,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:53,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:53,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:53,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:54,245 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:54,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010276575] [2022-01-31 21:30:54,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2010276575] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:54,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:54,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:30:54,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877988492] [2022-01-31 21:30:54,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:54,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:30:54,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:54,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:30:54,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:30:54,247 INFO L87 Difference]: Start difference. First operand 118 states and 149 transitions. Second operand has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:54,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:54,488 INFO L93 Difference]: Finished difference Result 210 states and 272 transitions. [2022-01-31 21:30:54,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:30:54,489 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-01-31 21:30:54,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:54,490 INFO L225 Difference]: With dead ends: 210 [2022-01-31 21:30:54,490 INFO L226 Difference]: Without dead ends: 130 [2022-01-31 21:30:54,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:30:54,491 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:54,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 60 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:54,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-01-31 21:30:54,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 121. [2022-01-31 21:30:54,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 106 states have (on average 1.2830188679245282) internal successors, (136), 109 states have internal predecessors, (136), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:54,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 153 transitions. [2022-01-31 21:30:54,506 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 153 transitions. Word has length 31 [2022-01-31 21:30:54,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:54,507 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 153 transitions. [2022-01-31 21:30:54,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 16 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:54,507 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 153 transitions. [2022-01-31 21:30:54,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-31 21:30:54,507 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:54,508 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:54,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:30:54,508 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:54,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:54,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1482120420, now seen corresponding path program 4 times [2022-01-31 21:30:54,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:54,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10809088] [2022-01-31 21:30:54,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:54,548 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:54,588 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:54,589 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:54,640 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:54,685 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:54,685 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:54,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:54,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:54,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:54,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:54,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:54,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:54,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:55,073 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:55,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10809088] [2022-01-31 21:30:55,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [10809088] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:55,074 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:55,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:30:55,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823349377] [2022-01-31 21:30:55,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:55,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:30:55,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:55,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:30:55,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:30:55,075 INFO L87 Difference]: Start difference. First operand 121 states and 153 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:55,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:55,279 INFO L93 Difference]: Finished difference Result 201 states and 260 transitions. [2022-01-31 21:30:55,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:30:55,279 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-01-31 21:30:55,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:55,280 INFO L225 Difference]: With dead ends: 201 [2022-01-31 21:30:55,280 INFO L226 Difference]: Without dead ends: 132 [2022-01-31 21:30:55,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:30:55,281 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:55,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 58 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:55,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-01-31 21:30:55,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2022-01-31 21:30:55,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 109 states have (on average 1.275229357798165) internal successors, (139), 112 states have internal predecessors, (139), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:55,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 156 transitions. [2022-01-31 21:30:55,319 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 156 transitions. Word has length 34 [2022-01-31 21:30:55,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:55,319 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 156 transitions. [2022-01-31 21:30:55,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:55,320 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 156 transitions. [2022-01-31 21:30:55,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-31 21:30:55,320 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:55,320 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:55,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:30:55,320 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:55,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:55,321 INFO L85 PathProgramCache]: Analyzing trace with hash 1224498974, now seen corresponding path program 5 times [2022-01-31 21:30:55,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:55,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919553431] [2022-01-31 21:30:55,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:55,373 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:55,403 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:55,404 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:55,437 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:55,461 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:55,461 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:55,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:55,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:55,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:55,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:55,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:55,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:55,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:55,759 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:55,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [919553431] [2022-01-31 21:30:55,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [919553431] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:55,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:55,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:30:55,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703462055] [2022-01-31 21:30:55,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:55,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:30:55,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:55,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:30:55,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:30:55,760 INFO L87 Difference]: Start difference. First operand 124 states and 156 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:56,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:56,035 INFO L93 Difference]: Finished difference Result 205 states and 264 transitions. [2022-01-31 21:30:56,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:30:56,037 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-01-31 21:30:56,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:56,038 INFO L225 Difference]: With dead ends: 205 [2022-01-31 21:30:56,038 INFO L226 Difference]: Without dead ends: 136 [2022-01-31 21:30:56,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:30:56,039 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:56,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 68 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:56,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-01-31 21:30:56,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 124. [2022-01-31 21:30:56,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 109 states have (on average 1.275229357798165) internal successors, (139), 112 states have internal predecessors, (139), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:56,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 156 transitions. [2022-01-31 21:30:56,052 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 156 transitions. Word has length 34 [2022-01-31 21:30:56,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:56,052 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 156 transitions. [2022-01-31 21:30:56,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:56,052 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 156 transitions. [2022-01-31 21:30:56,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-31 21:30:56,053 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:56,053 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:56,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:30:56,053 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:56,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:56,053 INFO L85 PathProgramCache]: Analyzing trace with hash 213381724, now seen corresponding path program 6 times [2022-01-31 21:30:56,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:56,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1766669417] [2022-01-31 21:30:56,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:56,096 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,097 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:56,149 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,194 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,194 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:56,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:56,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:56,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:56,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:56,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:56,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:56,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:56,597 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:56,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1766669417] [2022-01-31 21:30:56,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1766669417] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:56,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:56,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:30:56,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353981741] [2022-01-31 21:30:56,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:56,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:30:56,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:56,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:30:56,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:30:56,599 INFO L87 Difference]: Start difference. First operand 124 states and 156 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:56,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:56,842 INFO L93 Difference]: Finished difference Result 216 states and 279 transitions. [2022-01-31 21:30:56,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:30:56,842 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-01-31 21:30:56,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:56,843 INFO L225 Difference]: With dead ends: 216 [2022-01-31 21:30:56,843 INFO L226 Difference]: Without dead ends: 136 [2022-01-31 21:30:56,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:30:56,844 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:56,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 62 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:56,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-01-31 21:30:56,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 127. [2022-01-31 21:30:56,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 112 states have (on average 1.2767857142857142) internal successors, (143), 115 states have internal predecessors, (143), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:56,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 160 transitions. [2022-01-31 21:30:56,857 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 160 transitions. Word has length 34 [2022-01-31 21:30:56,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:56,857 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 160 transitions. [2022-01-31 21:30:56,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 18 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:56,857 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 160 transitions. [2022-01-31 21:30:56,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:30:56,857 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:56,857 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:56,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:30:56,857 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:56,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:56,858 INFO L85 PathProgramCache]: Analyzing trace with hash -802454433, now seen corresponding path program 7 times [2022-01-31 21:30:56,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:56,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423488188] [2022-01-31 21:30:56,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:56,902 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,936 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,936 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:56,984 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,029 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,029 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:57,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:57,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:57,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:57,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:57,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:57,473 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:57,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423488188] [2022-01-31 21:30:57,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [423488188] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:57,473 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:57,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:30:57,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147496388] [2022-01-31 21:30:57,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:57,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:30:57,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:57,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:30:57,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:30:57,474 INFO L87 Difference]: Start difference. First operand 127 states and 160 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:57,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:57,757 INFO L93 Difference]: Finished difference Result 210 states and 270 transitions. [2022-01-31 21:30:57,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:30:57,757 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-01-31 21:30:57,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:57,758 INFO L225 Difference]: With dead ends: 210 [2022-01-31 21:30:57,758 INFO L226 Difference]: Without dead ends: 141 [2022-01-31 21:30:57,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:30:57,759 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 44 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:57,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 62 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:57,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-01-31 21:30:57,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 130. [2022-01-31 21:30:57,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 115 states have (on average 1.2695652173913043) internal successors, (146), 118 states have internal predecessors, (146), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:57,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 163 transitions. [2022-01-31 21:30:57,776 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 163 transitions. Word has length 37 [2022-01-31 21:30:57,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:57,777 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 163 transitions. [2022-01-31 21:30:57,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:57,777 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 163 transitions. [2022-01-31 21:30:57,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:30:57,778 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:57,778 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:57,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:30:57,778 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:57,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:57,778 INFO L85 PathProgramCache]: Analyzing trace with hash -1620102883, now seen corresponding path program 8 times [2022-01-31 21:30:57,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:57,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1787310018] [2022-01-31 21:30:57,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:57,826 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,869 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,870 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:57,918 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,965 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:57,966 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:57,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:57,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:58,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:58,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:58,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:58,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:58,449 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:58,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1787310018] [2022-01-31 21:30:58,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1787310018] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:58,449 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:58,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:30:58,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103786500] [2022-01-31 21:30:58,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:58,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:30:58,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:58,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:30:58,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:30:58,450 INFO L87 Difference]: Start difference. First operand 130 states and 163 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:58,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:58,695 INFO L93 Difference]: Finished difference Result 213 states and 273 transitions. [2022-01-31 21:30:58,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:30:58,695 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-01-31 21:30:58,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:58,696 INFO L225 Difference]: With dead ends: 213 [2022-01-31 21:30:58,696 INFO L226 Difference]: Without dead ends: 144 [2022-01-31 21:30:58,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:30:58,697 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:58,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 61 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 602 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:58,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-01-31 21:30:58,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 130. [2022-01-31 21:30:58,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 115 states have (on average 1.2695652173913043) internal successors, (146), 118 states have internal predecessors, (146), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:58,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 163 transitions. [2022-01-31 21:30:58,738 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 163 transitions. Word has length 37 [2022-01-31 21:30:58,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:58,738 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 163 transitions. [2022-01-31 21:30:58,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:58,738 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 163 transitions. [2022-01-31 21:30:58,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:30:58,738 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:58,738 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:58,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:30:58,739 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:58,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:58,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1086516511, now seen corresponding path program 9 times [2022-01-31 21:30:58,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:58,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55601725] [2022-01-31 21:30:58,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:58,787 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:58,832 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:58,832 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:58,867 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:58,910 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:58,910 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:58,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:58,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:59,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:59,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,047 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:59,362 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:59,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55601725] [2022-01-31 21:30:59,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [55601725] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:59,363 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:59,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:30:59,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096534100] [2022-01-31 21:30:59,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:59,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:30:59,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:59,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:30:59,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:30:59,364 INFO L87 Difference]: Start difference. First operand 130 states and 163 transitions. Second operand has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:59,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:59,631 INFO L93 Difference]: Finished difference Result 211 states and 271 transitions. [2022-01-31 21:30:59,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:30:59,632 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-01-31 21:30:59,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:59,632 INFO L225 Difference]: With dead ends: 211 [2022-01-31 21:30:59,633 INFO L226 Difference]: Without dead ends: 142 [2022-01-31 21:30:59,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:30:59,634 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:59,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 62 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:30:59,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-01-31 21:30:59,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 130. [2022-01-31 21:30:59,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 115 states have (on average 1.2695652173913043) internal successors, (146), 118 states have internal predecessors, (146), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:30:59,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 163 transitions. [2022-01-31 21:30:59,656 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 163 transitions. Word has length 37 [2022-01-31 21:30:59,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:59,656 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 163 transitions. [2022-01-31 21:30:59,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:30:59,656 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 163 transitions. [2022-01-31 21:30:59,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:30:59,660 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:59,660 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:59,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:30:59,660 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:59,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:59,661 INFO L85 PathProgramCache]: Analyzing trace with hash 75399261, now seen corresponding path program 10 times [2022-01-31 21:30:59,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:59,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563696312] [2022-01-31 21:30:59,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:59,693 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:59,693 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:30:59,762 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:59,804 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:59,804 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:59,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:59,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,948 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:59,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:30:59,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:59,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:00,245 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:00,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563696312] [2022-01-31 21:31:00,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [563696312] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:00,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:00,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:31:00,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706538762] [2022-01-31 21:31:00,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:00,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:31:00,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:00,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:31:00,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:31:00,248 INFO L87 Difference]: Start difference. First operand 130 states and 163 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:00,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:00,527 INFO L93 Difference]: Finished difference Result 222 states and 286 transitions. [2022-01-31 21:31:00,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:31:00,527 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-01-31 21:31:00,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:00,528 INFO L225 Difference]: With dead ends: 222 [2022-01-31 21:31:00,528 INFO L226 Difference]: Without dead ends: 142 [2022-01-31 21:31:00,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:00,529 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:00,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 62 Invalid, 697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:00,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-01-31 21:31:00,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 133. [2022-01-31 21:31:00,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 118 states have (on average 1.271186440677966) internal successors, (150), 121 states have internal predecessors, (150), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:00,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 167 transitions. [2022-01-31 21:31:00,543 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 167 transitions. Word has length 37 [2022-01-31 21:31:00,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:00,543 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 167 transitions. [2022-01-31 21:31:00,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:00,544 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 167 transitions. [2022-01-31 21:31:00,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-01-31 21:31:00,544 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:00,544 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:00,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:31:00,544 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:00,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:00,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1742651763, now seen corresponding path program 1 times [2022-01-31 21:31:00,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:00,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809030402] [2022-01-31 21:31:00,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:00,625 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:00,703 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:00,703 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:00,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:00,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:00,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:00,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:00,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:00,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:00,778 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809030402] [2022-01-31 21:31:00,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1809030402] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:00,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:00,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:31:00,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997227076] [2022-01-31 21:31:00,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:00,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:31:00,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:00,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:31:00,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:31:00,780 INFO L87 Difference]: Start difference. First operand 133 states and 167 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:00,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:00,884 INFO L93 Difference]: Finished difference Result 242 states and 310 transitions. [2022-01-31 21:31:00,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:31:00,884 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2022-01-31 21:31:00,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:00,885 INFO L225 Difference]: With dead ends: 242 [2022-01-31 21:31:00,885 INFO L226 Difference]: Without dead ends: 164 [2022-01-31 21:31:00,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2022-01-31 21:31:00,888 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 46 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:00,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 25 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:31:00,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-01-31 21:31:00,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 147. [2022-01-31 21:31:00,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 132 states have (on average 1.2424242424242424) internal successors, (164), 135 states have internal predecessors, (164), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:00,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 181 transitions. [2022-01-31 21:31:00,918 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 181 transitions. Word has length 39 [2022-01-31 21:31:00,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:00,918 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 181 transitions. [2022-01-31 21:31:00,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:00,918 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 181 transitions. [2022-01-31 21:31:00,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:31:00,919 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:00,919 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:00,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:31:00,919 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:00,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:00,919 INFO L85 PathProgramCache]: Analyzing trace with hash 651130940, now seen corresponding path program 11 times [2022-01-31 21:31:00,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:00,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618375123] [2022-01-31 21:31:00,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:00,971 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,019 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,019 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:01,076 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,124 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,125 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:01,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:01,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:01,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:01,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:01,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:01,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:01,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:01,610 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:01,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618375123] [2022-01-31 21:31:01,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [618375123] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:01,611 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:01,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:31:01,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458342325] [2022-01-31 21:31:01,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:01,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:31:01,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:01,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:31:01,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:31:01,612 INFO L87 Difference]: Start difference. First operand 147 states and 181 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:01,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:01,855 INFO L93 Difference]: Finished difference Result 245 states and 306 transitions. [2022-01-31 21:31:01,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:31:01,855 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-01-31 21:31:01,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:01,856 INFO L225 Difference]: With dead ends: 245 [2022-01-31 21:31:01,856 INFO L226 Difference]: Without dead ends: 164 [2022-01-31 21:31:01,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:31:01,858 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:01,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 56 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:01,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-01-31 21:31:01,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 150. [2022-01-31 21:31:01,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 135 states have (on average 1.237037037037037) internal successors, (167), 138 states have internal predecessors, (167), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:01,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 184 transitions. [2022-01-31 21:31:01,878 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 184 transitions. Word has length 40 [2022-01-31 21:31:01,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:01,878 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 184 transitions. [2022-01-31 21:31:01,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:01,878 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 184 transitions. [2022-01-31 21:31:01,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:31:01,879 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:01,879 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:01,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:31:01,879 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:01,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:01,879 INFO L85 PathProgramCache]: Analyzing trace with hash -1154307394, now seen corresponding path program 12 times [2022-01-31 21:31:01,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:01,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616132884] [2022-01-31 21:31:01,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:01,933 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,983 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:01,984 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,015 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,058 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,058 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:02,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:02,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:02,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:02,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:02,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:02,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:02,555 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:02,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616132884] [2022-01-31 21:31:02,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1616132884] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:02,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:02,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:31:02,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712863127] [2022-01-31 21:31:02,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:02,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:31:02,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:02,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:31:02,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:31:02,557 INFO L87 Difference]: Start difference. First operand 150 states and 184 transitions. Second operand has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:02,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:02,825 INFO L93 Difference]: Finished difference Result 248 states and 309 transitions. [2022-01-31 21:31:02,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:31:02,825 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-01-31 21:31:02,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:02,826 INFO L225 Difference]: With dead ends: 248 [2022-01-31 21:31:02,826 INFO L226 Difference]: Without dead ends: 167 [2022-01-31 21:31:02,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:02,827 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:02,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 60 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:02,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-01-31 21:31:02,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 150. [2022-01-31 21:31:02,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 135 states have (on average 1.237037037037037) internal successors, (167), 138 states have internal predecessors, (167), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:02,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 184 transitions. [2022-01-31 21:31:02,847 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 184 transitions. Word has length 40 [2022-01-31 21:31:02,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:02,847 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 184 transitions. [2022-01-31 21:31:02,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:02,847 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 184 transitions. [2022-01-31 21:31:02,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:31:02,847 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:02,847 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:02,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:31:02,848 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:02,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:02,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1971955844, now seen corresponding path program 13 times [2022-01-31 21:31:02,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:02,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558780842] [2022-01-31 21:31:02,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:02,897 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,928 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,928 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,967 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,995 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,995 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:03,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:03,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:03,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:03,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:03,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:03,551 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:03,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558780842] [2022-01-31 21:31:03,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [558780842] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:03,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:03,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:31:03,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816006032] [2022-01-31 21:31:03,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:03,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:31:03,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:03,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:31:03,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:31:03,555 INFO L87 Difference]: Start difference. First operand 150 states and 184 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:03,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:03,826 INFO L93 Difference]: Finished difference Result 245 states and 306 transitions. [2022-01-31 21:31:03,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:31:03,827 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-01-31 21:31:03,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:03,827 INFO L225 Difference]: With dead ends: 245 [2022-01-31 21:31:03,828 INFO L226 Difference]: Without dead ends: 164 [2022-01-31 21:31:03,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:03,828 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:03,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 60 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:03,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-01-31 21:31:03,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 150. [2022-01-31 21:31:03,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 135 states have (on average 1.237037037037037) internal successors, (167), 138 states have internal predecessors, (167), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:03,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 184 transitions. [2022-01-31 21:31:03,850 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 184 transitions. Word has length 40 [2022-01-31 21:31:03,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:03,850 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 184 transitions. [2022-01-31 21:31:03,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:03,850 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 184 transitions. [2022-01-31 21:31:03,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:31:03,850 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:03,850 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:03,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:31:03,851 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:03,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:03,851 INFO L85 PathProgramCache]: Analyzing trace with hash 734663550, now seen corresponding path program 14 times [2022-01-31 21:31:03,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:03,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911796742] [2022-01-31 21:31:03,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:03,900 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:03,948 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:03,948 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:03,987 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:04,032 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:04,032 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:04,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:04,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:04,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:04,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:04,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:04,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:04,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:04,547 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:04,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911796742] [2022-01-31 21:31:04,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1911796742] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:04,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:04,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:31:04,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551442094] [2022-01-31 21:31:04,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:04,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:31:04,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:04,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:31:04,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:04,548 INFO L87 Difference]: Start difference. First operand 150 states and 184 transitions. Second operand has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:04,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:04,907 INFO L93 Difference]: Finished difference Result 243 states and 304 transitions. [2022-01-31 21:31:04,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:31:04,907 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-01-31 21:31:04,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:04,908 INFO L225 Difference]: With dead ends: 243 [2022-01-31 21:31:04,908 INFO L226 Difference]: Without dead ends: 162 [2022-01-31 21:31:04,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:04,909 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:04,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 62 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:04,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-01-31 21:31:04,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 150. [2022-01-31 21:31:04,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 135 states have (on average 1.237037037037037) internal successors, (167), 138 states have internal predecessors, (167), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:04,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 184 transitions. [2022-01-31 21:31:04,929 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 184 transitions. Word has length 40 [2022-01-31 21:31:04,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:04,930 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 184 transitions. [2022-01-31 21:31:04,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:04,930 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 184 transitions. [2022-01-31 21:31:04,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:31:04,930 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:04,930 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:04,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:31:04,930 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:04,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:04,931 INFO L85 PathProgramCache]: Analyzing trace with hash -276453700, now seen corresponding path program 15 times [2022-01-31 21:31:04,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:04,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352882290] [2022-01-31 21:31:04,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:04,977 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:04,977 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:05,026 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:05,068 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:05,068 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:05,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:05,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:05,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:05,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:05,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:05,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:05,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:05,589 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:05,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352882290] [2022-01-31 21:31:05,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [352882290] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:05,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:05,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:31:05,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665719155] [2022-01-31 21:31:05,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:05,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:31:05,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:05,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:31:05,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:05,591 INFO L87 Difference]: Start difference. First operand 150 states and 184 transitions. Second operand has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:05,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:05,909 INFO L93 Difference]: Finished difference Result 254 states and 319 transitions. [2022-01-31 21:31:05,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:31:05,910 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-01-31 21:31:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:05,910 INFO L225 Difference]: With dead ends: 254 [2022-01-31 21:31:05,910 INFO L226 Difference]: Without dead ends: 162 [2022-01-31 21:31:05,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:05,911 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 788 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:05,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 63 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 788 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:05,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-01-31 21:31:05,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 153. [2022-01-31 21:31:05,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 138 states have (on average 1.2391304347826086) internal successors, (171), 141 states have internal predecessors, (171), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:05,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 188 transitions. [2022-01-31 21:31:05,931 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 188 transitions. Word has length 40 [2022-01-31 21:31:05,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:05,931 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 188 transitions. [2022-01-31 21:31:05,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 22 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:05,931 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 188 transitions. [2022-01-31 21:31:05,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:05,932 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:05,932 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:05,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:31:05,932 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:05,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:05,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1742267585, now seen corresponding path program 16 times [2022-01-31 21:31:05,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:05,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426286999] [2022-01-31 21:31:05,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:05,982 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:06,045 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:06,046 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:06,096 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:06,146 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:06,146 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:06,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:06,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:06,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:06,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:06,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:06,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:06,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:06,770 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:06,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426286999] [2022-01-31 21:31:06,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1426286999] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:06,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:06,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:31:06,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118724339] [2022-01-31 21:31:06,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:06,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:31:06,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:06,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:31:06,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:31:06,773 INFO L87 Difference]: Start difference. First operand 153 states and 188 transitions. Second operand has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:07,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:07,115 INFO L93 Difference]: Finished difference Result 254 states and 316 transitions. [2022-01-31 21:31:07,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:31:07,116 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:07,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:07,117 INFO L225 Difference]: With dead ends: 254 [2022-01-31 21:31:07,117 INFO L226 Difference]: Without dead ends: 173 [2022-01-31 21:31:07,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:07,118 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 46 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:07,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 56 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:07,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-01-31 21:31:07,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 156. [2022-01-31 21:31:07,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 141 states have (on average 1.2340425531914894) internal successors, (174), 144 states have internal predecessors, (174), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:07,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2022-01-31 21:31:07,150 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 43 [2022-01-31 21:31:07,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:07,151 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2022-01-31 21:31:07,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:07,151 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2022-01-31 21:31:07,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:07,151 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:07,151 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:07,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:31:07,152 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:07,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:07,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1680227971, now seen corresponding path program 17 times [2022-01-31 21:31:07,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:07,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564587167] [2022-01-31 21:31:07,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:07,201 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:07,255 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:07,255 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:07,304 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:07,347 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:07,348 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:07,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:07,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:07,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:07,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:07,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:07,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:07,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:07,912 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:07,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564587167] [2022-01-31 21:31:07,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [564587167] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:07,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:07,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:31:07,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119217600] [2022-01-31 21:31:07,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:07,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:31:07,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:07,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:31:07,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:31:07,913 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:08,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:08,210 INFO L93 Difference]: Finished difference Result 257 states and 319 transitions. [2022-01-31 21:31:08,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:31:08,211 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:08,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:08,211 INFO L225 Difference]: With dead ends: 257 [2022-01-31 21:31:08,211 INFO L226 Difference]: Without dead ends: 176 [2022-01-31 21:31:08,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:08,212 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 809 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 809 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:08,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 62 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 809 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:08,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-01-31 21:31:08,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 156. [2022-01-31 21:31:08,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 141 states have (on average 1.2340425531914894) internal successors, (174), 144 states have internal predecessors, (174), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:08,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2022-01-31 21:31:08,235 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 43 [2022-01-31 21:31:08,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:08,235 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2022-01-31 21:31:08,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 20 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:08,235 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2022-01-31 21:31:08,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:08,236 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:08,236 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:08,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:31:08,236 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:08,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:08,236 INFO L85 PathProgramCache]: Analyzing trace with hash 809300991, now seen corresponding path program 18 times [2022-01-31 21:31:08,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:08,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831209641] [2022-01-31 21:31:08,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:08,280 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:08,329 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:08,330 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:08,361 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:08,406 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:08,406 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:08,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:08,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:08,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:08,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:08,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:08,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:08,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:08,884 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:08,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831209641] [2022-01-31 21:31:08,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1831209641] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:08,885 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:08,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:31:08,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224868834] [2022-01-31 21:31:08,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:08,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:31:08,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:08,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:31:08,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:08,886 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:09,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:09,165 INFO L93 Difference]: Finished difference Result 254 states and 316 transitions. [2022-01-31 21:31:09,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:31:09,167 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:09,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:09,168 INFO L225 Difference]: With dead ends: 254 [2022-01-31 21:31:09,168 INFO L226 Difference]: Without dead ends: 173 [2022-01-31 21:31:09,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:09,169 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 917 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:09,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 70 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 917 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:09,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-01-31 21:31:09,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 156. [2022-01-31 21:31:09,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 141 states have (on average 1.2340425531914894) internal successors, (174), 144 states have internal predecessors, (174), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:09,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2022-01-31 21:31:09,231 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 43 [2022-01-31 21:31:09,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:09,231 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2022-01-31 21:31:09,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:09,232 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2022-01-31 21:31:09,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:09,232 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:09,232 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:09,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:31:09,232 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:09,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:09,233 INFO L85 PathProgramCache]: Analyzing trace with hash -8347459, now seen corresponding path program 19 times [2022-01-31 21:31:09,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:09,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142112009] [2022-01-31 21:31:09,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:09,294 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,338 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,339 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:09,373 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,405 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,405 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:09,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:09,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:09,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:09,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:09,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:09,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:09,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:09,855 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:09,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142112009] [2022-01-31 21:31:09,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [142112009] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:09,856 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:09,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:31:09,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556605181] [2022-01-31 21:31:09,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:09,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:31:09,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:09,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:31:09,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:09,857 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:10,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:10,118 INFO L93 Difference]: Finished difference Result 251 states and 313 transitions. [2022-01-31 21:31:10,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:31:10,119 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:10,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:10,119 INFO L225 Difference]: With dead ends: 251 [2022-01-31 21:31:10,119 INFO L226 Difference]: Without dead ends: 170 [2022-01-31 21:31:10,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:10,120 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 873 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 873 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:10,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 73 Invalid, 884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 873 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:10,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-01-31 21:31:10,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 156. [2022-01-31 21:31:10,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 141 states have (on average 1.2340425531914894) internal successors, (174), 144 states have internal predecessors, (174), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:10,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2022-01-31 21:31:10,146 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 43 [2022-01-31 21:31:10,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:10,146 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2022-01-31 21:31:10,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 22 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:10,147 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2022-01-31 21:31:10,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:10,147 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:10,147 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:10,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:31:10,147 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:10,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:10,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1596695361, now seen corresponding path program 20 times [2022-01-31 21:31:10,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:10,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472421066] [2022-01-31 21:31:10,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:10,178 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:10,224 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:10,225 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:10,249 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:10,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:10,282 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:10,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:10,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:10,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:10,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:10,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:10,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:10,816 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:10,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472421066] [2022-01-31 21:31:10,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [472421066] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:10,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:10,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:31:10,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956665944] [2022-01-31 21:31:10,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:10,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:31:10,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:10,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:31:10,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:10,820 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:11,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:11,067 INFO L93 Difference]: Finished difference Result 249 states and 311 transitions. [2022-01-31 21:31:11,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:31:11,068 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:11,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:11,069 INFO L225 Difference]: With dead ends: 249 [2022-01-31 21:31:11,069 INFO L226 Difference]: Without dead ends: 168 [2022-01-31 21:31:11,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:11,069 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 822 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:11,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 64 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 822 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:11,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-01-31 21:31:11,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 156. [2022-01-31 21:31:11,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 141 states have (on average 1.2340425531914894) internal successors, (174), 144 states have internal predecessors, (174), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:11,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 191 transitions. [2022-01-31 21:31:11,093 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 191 transitions. Word has length 43 [2022-01-31 21:31:11,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:11,093 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 191 transitions. [2022-01-31 21:31:11,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.48) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:11,094 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 191 transitions. [2022-01-31 21:31:11,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:31:11,094 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:11,094 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:11,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:31:11,094 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:11,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:11,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1687154685, now seen corresponding path program 21 times [2022-01-31 21:31:11,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:11,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684089076] [2022-01-31 21:31:11,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:11,135 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:11,136 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:11,168 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:11,210 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:11,210 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:11,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:11,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:11,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:11,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:11,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:11,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:11,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:11,781 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:11,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684089076] [2022-01-31 21:31:11,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [684089076] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:11,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:11,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:11,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725878833] [2022-01-31 21:31:11,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:11,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:11,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:11,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:11,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:11,783 INFO L87 Difference]: Start difference. First operand 156 states and 191 transitions. Second operand has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:12,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:12,142 INFO L93 Difference]: Finished difference Result 260 states and 326 transitions. [2022-01-31 21:31:12,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:12,143 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-01-31 21:31:12,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:12,143 INFO L225 Difference]: With dead ends: 260 [2022-01-31 21:31:12,143 INFO L226 Difference]: Without dead ends: 168 [2022-01-31 21:31:12,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:12,144 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:12,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 67 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:12,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-01-31 21:31:12,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 159. [2022-01-31 21:31:12,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 144 states have (on average 1.2361111111111112) internal successors, (178), 147 states have internal predecessors, (178), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:12,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 195 transitions. [2022-01-31 21:31:12,168 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 195 transitions. Word has length 43 [2022-01-31 21:31:12,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:12,168 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 195 transitions. [2022-01-31 21:31:12,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:12,169 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 195 transitions. [2022-01-31 21:31:12,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-01-31 21:31:12,169 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:12,169 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:12,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:31:12,169 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:12,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:12,169 INFO L85 PathProgramCache]: Analyzing trace with hash -2117823645, now seen corresponding path program 2 times [2022-01-31 21:31:12,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:12,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245860904] [2022-01-31 21:31:12,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:12,240 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,309 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,310 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:12,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:12,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:12,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:12,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:12,401 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:12,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245860904] [2022-01-31 21:31:12,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1245860904] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:12,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:12,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 21:31:12,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322957072] [2022-01-31 21:31:12,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:12,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 21:31:12,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:12,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 21:31:12,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2022-01-31 21:31:12,402 INFO L87 Difference]: Start difference. First operand 159 states and 195 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:12,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:12,511 INFO L93 Difference]: Finished difference Result 296 states and 372 transitions. [2022-01-31 21:31:12,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:31:12,511 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2022-01-31 21:31:12,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:12,512 INFO L225 Difference]: With dead ends: 296 [2022-01-31 21:31:12,512 INFO L226 Difference]: Without dead ends: 206 [2022-01-31 21:31:12,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:31:12,512 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:12,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 27 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:31:12,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-01-31 21:31:12,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 184. [2022-01-31 21:31:12,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 169 states have (on average 1.2189349112426036) internal successors, (206), 172 states have internal predecessors, (206), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:12,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 223 transitions. [2022-01-31 21:31:12,540 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 223 transitions. Word has length 45 [2022-01-31 21:31:12,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:12,540 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 223 transitions. [2022-01-31 21:31:12,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:12,540 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 223 transitions. [2022-01-31 21:31:12,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:12,541 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:12,541 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:12,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:31:12,541 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:12,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:12,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1569322332, now seen corresponding path program 22 times [2022-01-31 21:31:12,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:12,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161729024] [2022-01-31 21:31:12,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:12,589 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,635 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,635 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:12,680 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,711 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:12,712 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:12,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:12,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:12,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:12,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:12,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:13,291 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:13,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161729024] [2022-01-31 21:31:13,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1161729024] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:13,291 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:13,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:31:13,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285225146] [2022-01-31 21:31:13,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:13,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:31:13,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:13,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:31:13,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:31:13,292 INFO L87 Difference]: Start difference. First operand 184 states and 223 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:13,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:13,559 INFO L93 Difference]: Finished difference Result 314 states and 383 transitions. [2022-01-31 21:31:13,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:31:13,559 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:13,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:13,560 INFO L225 Difference]: With dead ends: 314 [2022-01-31 21:31:13,560 INFO L226 Difference]: Without dead ends: 209 [2022-01-31 21:31:13,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:13,561 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 721 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:13,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 56 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 721 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:13,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-01-31 21:31:13,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 187. [2022-01-31 21:31:13,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:13,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:13,594 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:13,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:13,594 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:13,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:13,594 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:13,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:13,594 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:13,595 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:13,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:31:13,595 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:13,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:13,595 INFO L85 PathProgramCache]: Analyzing trace with hash -1339441570, now seen corresponding path program 23 times [2022-01-31 21:31:13,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:13,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351014219] [2022-01-31 21:31:13,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:13,621 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:13,645 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:13,645 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:13,680 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:13,730 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:13,730 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:13,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:13,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:13,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:13,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:13,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:13,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:14,336 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:14,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351014219] [2022-01-31 21:31:14,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1351014219] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:14,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:14,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:31:14,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93014596] [2022-01-31 21:31:14,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:14,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:31:14,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:14,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:31:14,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:14,337 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:14,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:14,740 INFO L93 Difference]: Finished difference Result 317 states and 386 transitions. [2022-01-31 21:31:14,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:31:14,740 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:14,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:14,741 INFO L225 Difference]: With dead ends: 317 [2022-01-31 21:31:14,741 INFO L226 Difference]: Without dead ends: 212 [2022-01-31 21:31:14,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:14,742 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 972 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:14,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 67 Invalid, 983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 972 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:14,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-01-31 21:31:14,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 187. [2022-01-31 21:31:14,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:14,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:14,775 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:14,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:14,775 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:14,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:14,775 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:14,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:14,775 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:14,775 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:14,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:31:14,775 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:14,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:14,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1277401956, now seen corresponding path program 24 times [2022-01-31 21:31:14,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:14,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430955930] [2022-01-31 21:31:14,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:14,835 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:14,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:14,880 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:14,931 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:14,973 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:14,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:14,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:14,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:15,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:15,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:15,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:15,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:15,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:15,653 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:15,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430955930] [2022-01-31 21:31:15,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1430955930] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:15,653 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:15,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:31:15,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202351203] [2022-01-31 21:31:15,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:15,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:31:15,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:15,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:31:15,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:15,654 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:16,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:16,020 INFO L93 Difference]: Finished difference Result 314 states and 383 transitions. [2022-01-31 21:31:16,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:31:16,021 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:16,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:16,021 INFO L225 Difference]: With dead ends: 314 [2022-01-31 21:31:16,021 INFO L226 Difference]: Without dead ends: 209 [2022-01-31 21:31:16,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:16,022 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 955 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:16,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 70 Invalid, 965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 955 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:16,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-01-31 21:31:16,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 187. [2022-01-31 21:31:16,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:16,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:16,056 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:16,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:16,057 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:16,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 22 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:16,057 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:16,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:16,057 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:16,057 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:16,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:31:16,058 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:16,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:16,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1212127006, now seen corresponding path program 25 times [2022-01-31 21:31:16,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:16,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411037159] [2022-01-31 21:31:16,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:16,093 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:16,118 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:16,118 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:16,151 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:16,208 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:16,208 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:16,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:16,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:16,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:16,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:16,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:16,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:16,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:16,828 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:16,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411037159] [2022-01-31 21:31:16,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1411037159] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:16,828 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:16,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:31:16,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602164648] [2022-01-31 21:31:16,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:16,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:31:16,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:16,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:31:16,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:16,829 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:17,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:17,248 INFO L93 Difference]: Finished difference Result 311 states and 380 transitions. [2022-01-31 21:31:17,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:31:17,248 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:17,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:17,249 INFO L225 Difference]: With dead ends: 311 [2022-01-31 21:31:17,249 INFO L226 Difference]: Without dead ends: 206 [2022-01-31 21:31:17,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:17,250 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1001 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1001 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:17,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 72 Invalid, 1011 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1001 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:17,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-01-31 21:31:17,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 187. [2022-01-31 21:31:17,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:17,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:17,284 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:17,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:17,285 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:17,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 23 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:17,285 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:17,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:17,287 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:17,287 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:17,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:31:17,290 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:17,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:17,290 INFO L85 PathProgramCache]: Analyzing trace with hash 394478556, now seen corresponding path program 26 times [2022-01-31 21:31:17,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:17,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321554444] [2022-01-31 21:31:17,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:17,342 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:17,384 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:17,385 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:17,421 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:17,456 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:17,456 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:17,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:17,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:17,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:17,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:17,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:17,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:17,889 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:17,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321554444] [2022-01-31 21:31:17,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [321554444] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:17,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:17,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:17,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768800607] [2022-01-31 21:31:17,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:17,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:17,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:17,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:17,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:17,891 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:18,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:18,148 INFO L93 Difference]: Finished difference Result 308 states and 377 transitions. [2022-01-31 21:31:18,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:18,148 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:18,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:18,149 INFO L225 Difference]: With dead ends: 308 [2022-01-31 21:31:18,149 INFO L226 Difference]: Without dead ends: 203 [2022-01-31 21:31:18,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:18,152 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 861 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 861 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:18,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 56 Invalid, 872 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 861 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:18,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-01-31 21:31:18,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 187. [2022-01-31 21:31:18,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:18,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:18,198 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:18,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:18,199 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:18,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 24 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:18,199 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:18,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:18,199 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:18,199 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:18,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:31:18,199 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:18,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:18,200 INFO L85 PathProgramCache]: Analyzing trace with hash -1193869346, now seen corresponding path program 27 times [2022-01-31 21:31:18,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:18,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769001841] [2022-01-31 21:31:18,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:18,245 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:18,289 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:18,289 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:18,340 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:18,383 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:18,383 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:18,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:18,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:18,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:18,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:18,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:18,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:18,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:19,030 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:19,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769001841] [2022-01-31 21:31:19,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [769001841] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:19,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:19,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:31:19,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189537284] [2022-01-31 21:31:19,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:19,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:31:19,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:19,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:31:19,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:19,031 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:19,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:19,353 INFO L93 Difference]: Finished difference Result 306 states and 375 transitions. [2022-01-31 21:31:19,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:31:19,354 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:19,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:19,357 INFO L225 Difference]: With dead ends: 306 [2022-01-31 21:31:19,357 INFO L226 Difference]: Without dead ends: 201 [2022-01-31 21:31:19,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:19,358 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 1032 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 1042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:19,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 68 Invalid, 1042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1032 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:19,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-01-31 21:31:19,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 187. [2022-01-31 21:31:19,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 175 states have internal predecessors, (209), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:19,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 226 transitions. [2022-01-31 21:31:19,395 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 226 transitions. Word has length 46 [2022-01-31 21:31:19,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:19,395 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 226 transitions. [2022-01-31 21:31:19,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 25 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:19,396 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 226 transitions. [2022-01-31 21:31:19,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:31:19,396 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:19,396 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:19,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:31:19,396 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:19,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:19,396 INFO L85 PathProgramCache]: Analyzing trace with hash 2089980700, now seen corresponding path program 28 times [2022-01-31 21:31:19,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:19,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167357921] [2022-01-31 21:31:19,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:19,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:19,460 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:19,502 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:19,555 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:19,555 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:19,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:19,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:19,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:19,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:19,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:19,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:19,672 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:20,039 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:20,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167357921] [2022-01-31 21:31:20,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [167357921] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:20,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:20,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:31:20,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518518642] [2022-01-31 21:31:20,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:20,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:31:20,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:20,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:31:20,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:20,040 INFO L87 Difference]: Start difference. First operand 187 states and 226 transitions. Second operand has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:20,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:20,389 INFO L93 Difference]: Finished difference Result 317 states and 390 transitions. [2022-01-31 21:31:20,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:31:20,389 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-01-31 21:31:20,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:20,390 INFO L225 Difference]: With dead ends: 317 [2022-01-31 21:31:20,390 INFO L226 Difference]: Without dead ends: 201 [2022-01-31 21:31:20,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:20,390 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1312 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 1324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:20,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 82 Invalid, 1324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1312 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:20,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-01-31 21:31:20,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 190. [2022-01-31 21:31:20,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 175 states have (on average 1.217142857142857) internal successors, (213), 178 states have internal predecessors, (213), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:20,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 230 transitions. [2022-01-31 21:31:20,454 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 230 transitions. Word has length 46 [2022-01-31 21:31:20,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:20,454 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 230 transitions. [2022-01-31 21:31:20,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 26 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:20,454 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 230 transitions. [2022-01-31 21:31:20,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:20,455 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:20,455 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:20,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:31:20,455 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:20,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:20,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1745750559, now seen corresponding path program 29 times [2022-01-31 21:31:20,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:20,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356957663] [2022-01-31 21:31:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:20,510 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:20,538 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:20,539 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:20,570 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:20,612 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:20,612 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:20,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:20,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:20,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:20,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:20,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:20,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:20,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:21,295 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:21,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356957663] [2022-01-31 21:31:21,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [356957663] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:21,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:21,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:31:21,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198692543] [2022-01-31 21:31:21,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:21,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:31:21,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:21,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:31:21,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:31:21,297 INFO L87 Difference]: Start difference. First operand 190 states and 230 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:21,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:21,775 INFO L93 Difference]: Finished difference Result 323 states and 393 transitions. [2022-01-31 21:31:21,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:31:21,776 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:21,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:21,776 INFO L225 Difference]: With dead ends: 323 [2022-01-31 21:31:21,776 INFO L226 Difference]: Without dead ends: 218 [2022-01-31 21:31:21,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:21,777 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 1121 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:21,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 78 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1121 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:21,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-01-31 21:31:21,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 193. [2022-01-31 21:31:21,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:21,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:21,817 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:21,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:21,817 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:21,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:21,817 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:21,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:21,818 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:21,818 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:21,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:31:21,818 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:21,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:21,818 INFO L85 PathProgramCache]: Analyzing trace with hash 2020510173, now seen corresponding path program 30 times [2022-01-31 21:31:21,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:21,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407906886] [2022-01-31 21:31:21,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:21,865 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:21,911 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:21,911 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:21,954 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:21,996 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:21,997 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:21,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:22,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:22,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:22,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:22,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:22,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:22,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:22,739 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:22,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407906886] [2022-01-31 21:31:22,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [407906886] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:22,739 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:22,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:31:22,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460875410] [2022-01-31 21:31:22,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:22,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:31:22,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:22,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:31:22,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:22,740 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:23,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:23,223 INFO L93 Difference]: Finished difference Result 326 states and 396 transitions. [2022-01-31 21:31:23,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:31:23,223 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:23,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:23,224 INFO L225 Difference]: With dead ends: 326 [2022-01-31 21:31:23,224 INFO L226 Difference]: Without dead ends: 221 [2022-01-31 21:31:23,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:23,225 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 1098 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:23,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 75 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1098 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:23,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-01-31 21:31:23,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 193. [2022-01-31 21:31:23,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:23,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:23,268 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:23,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:23,268 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:23,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:23,268 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:23,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:23,268 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:23,268 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:23,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:31:23,269 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:23,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:23,269 INFO L85 PathProgramCache]: Analyzing trace with hash -888253729, now seen corresponding path program 31 times [2022-01-31 21:31:23,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:23,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956055616] [2022-01-31 21:31:23,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:23,316 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:23,357 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:23,358 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:23,385 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:23,419 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:23,419 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:23,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:23,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:23,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:23,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:23,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:23,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:23,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:24,098 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:24,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956055616] [2022-01-31 21:31:24,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [956055616] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:24,099 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:24,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:31:24,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114823638] [2022-01-31 21:31:24,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:24,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:31:24,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:24,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:31:24,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=601, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:24,100 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:24,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:24,475 INFO L93 Difference]: Finished difference Result 323 states and 393 transitions. [2022-01-31 21:31:24,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:31:24,475 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:24,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:24,476 INFO L225 Difference]: With dead ends: 323 [2022-01-31 21:31:24,476 INFO L226 Difference]: Without dead ends: 218 [2022-01-31 21:31:24,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:24,477 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 911 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:24,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 58 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 911 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:24,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-01-31 21:31:24,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 193. [2022-01-31 21:31:24,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:24,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:24,531 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:24,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:24,531 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:24,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:24,532 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:24,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:24,532 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:24,532 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:24,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:31:24,532 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:24,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:24,533 INFO L85 PathProgramCache]: Analyzing trace with hash -826214115, now seen corresponding path program 32 times [2022-01-31 21:31:24,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:24,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536946145] [2022-01-31 21:31:24,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:24,576 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:24,607 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:24,607 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:24,642 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:24,687 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:24,687 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:24,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:24,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:24,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:24,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:24,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:24,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:24,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:25,343 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:25,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536946145] [2022-01-31 21:31:25,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1536946145] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:25,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:25,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:25,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569795408] [2022-01-31 21:31:25,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:25,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:25,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:25,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:25,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:25,346 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:25,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:25,677 INFO L93 Difference]: Finished difference Result 320 states and 390 transitions. [2022-01-31 21:31:25,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:25,677 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:25,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:25,692 INFO L225 Difference]: With dead ends: 320 [2022-01-31 21:31:25,692 INFO L226 Difference]: Without dead ends: 215 [2022-01-31 21:31:25,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:25,702 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 1117 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:25,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 71 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1117 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:25,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-01-31 21:31:25,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 193. [2022-01-31 21:31:25,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:25,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:25,784 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:25,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:25,785 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:25,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 24 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:25,785 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:25,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:25,786 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:25,786 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:25,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:31:25,786 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:25,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:25,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1663314847, now seen corresponding path program 33 times [2022-01-31 21:31:25,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:25,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1001076090] [2022-01-31 21:31:25,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:25,817 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:25,846 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:25,846 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:25,892 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:25,914 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:25,915 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:25,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:25,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:26,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:26,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:26,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:26,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:26,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:26,387 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:26,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1001076090] [2022-01-31 21:31:26,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1001076090] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:26,388 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:26,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:31:26,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330301720] [2022-01-31 21:31:26,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:26,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:31:26,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:26,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:31:26,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:26,389 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:26,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:26,806 INFO L93 Difference]: Finished difference Result 317 states and 387 transitions. [2022-01-31 21:31:26,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:31:26,807 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:26,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:26,807 INFO L225 Difference]: With dead ends: 317 [2022-01-31 21:31:26,807 INFO L226 Difference]: Without dead ends: 212 [2022-01-31 21:31:26,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:26,808 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1355 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:26,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 74 Invalid, 1366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1355 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:26,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-01-31 21:31:26,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 193. [2022-01-31 21:31:26,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:26,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:26,855 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:26,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:26,856 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:26,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 25 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:26,856 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:26,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:26,856 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:26,856 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:26,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:31:26,857 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:26,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:26,857 INFO L85 PathProgramCache]: Analyzing trace with hash 845666397, now seen corresponding path program 34 times [2022-01-31 21:31:26,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:26,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214712997] [2022-01-31 21:31:26,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:26,892 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:26,921 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:26,921 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:26,943 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:26,970 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:26,970 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:26,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:26,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:27,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:27,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:27,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:27,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:27,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:27,465 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:27,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214712997] [2022-01-31 21:31:27,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1214712997] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:27,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:27,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:31:27,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256121215] [2022-01-31 21:31:27,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:27,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:31:27,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:27,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:31:27,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:27,484 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:27,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:27,953 INFO L93 Difference]: Finished difference Result 314 states and 384 transitions. [2022-01-31 21:31:27,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:31:27,953 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:27,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:27,954 INFO L225 Difference]: With dead ends: 314 [2022-01-31 21:31:27,954 INFO L226 Difference]: Without dead ends: 209 [2022-01-31 21:31:27,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:27,954 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 1294 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:27,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 75 Invalid, 1305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1294 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:27,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-01-31 21:31:28,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 193. [2022-01-31 21:31:28,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:28,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:28,005 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:28,005 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:28,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:28,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:28,005 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:28,005 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:28,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:31:28,006 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:28,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:28,006 INFO L85 PathProgramCache]: Analyzing trace with hash -742681505, now seen corresponding path program 35 times [2022-01-31 21:31:28,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:28,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101746423] [2022-01-31 21:31:28,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:28,074 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,130 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,130 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:28,190 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,247 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,248 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:28,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:28,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:28,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:28,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:28,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:28,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:28,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:28,818 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:28,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101746423] [2022-01-31 21:31:28,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2101746423] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:28,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:28,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:31:28,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390196256] [2022-01-31 21:31:28,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:28,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:31:28,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:28,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:31:28,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:28,820 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:29,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:29,166 INFO L93 Difference]: Finished difference Result 312 states and 382 transitions. [2022-01-31 21:31:29,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:31:29,166 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:29,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:29,167 INFO L225 Difference]: With dead ends: 312 [2022-01-31 21:31:29,167 INFO L226 Difference]: Without dead ends: 207 [2022-01-31 21:31:29,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:31:29,168 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1240 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:29,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 72 Invalid, 1250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1240 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:29,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-01-31 21:31:29,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 193. [2022-01-31 21:31:29,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 178 states have (on average 1.2134831460674158) internal successors, (216), 181 states have internal predecessors, (216), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:29,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2022-01-31 21:31:29,214 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 49 [2022-01-31 21:31:29,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:29,214 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2022-01-31 21:31:29,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4827586206896552) internal successors, (43), 27 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:29,215 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2022-01-31 21:31:29,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:31:29,215 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:29,215 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:29,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:31:29,215 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:29,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:29,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1753798755, now seen corresponding path program 36 times [2022-01-31 21:31:29,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:29,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136034254] [2022-01-31 21:31:29,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:29,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:29,263 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:29,289 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:29,318 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:29,318 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:29,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:29,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:29,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:29,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:29,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:29,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:29,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:30,061 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:30,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136034254] [2022-01-31 21:31:30,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2136034254] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:30,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:30,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:31:30,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944879794] [2022-01-31 21:31:30,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:30,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:31:30,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:30,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:31:30,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=856, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:30,063 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:30,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:30,624 INFO L93 Difference]: Finished difference Result 323 states and 397 transitions. [2022-01-31 21:31:30,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:31:30,624 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-01-31 21:31:30,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:30,625 INFO L225 Difference]: With dead ends: 323 [2022-01-31 21:31:30,625 INFO L226 Difference]: Without dead ends: 207 [2022-01-31 21:31:30,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=146, Invalid=976, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:31:30,627 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 1425 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 1436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:30,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 68 Invalid, 1436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1425 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:31:30,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-01-31 21:31:30,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 196. [2022-01-31 21:31:30,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 181 states have (on average 1.2154696132596685) internal successors, (220), 184 states have internal predecessors, (220), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:30,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 237 transitions. [2022-01-31 21:31:30,675 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 237 transitions. Word has length 49 [2022-01-31 21:31:30,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:30,675 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 237 transitions. [2022-01-31 21:31:30,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:30,675 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 237 transitions. [2022-01-31 21:31:30,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-01-31 21:31:30,675 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:30,675 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:30,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:31:30,676 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:30,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:30,676 INFO L85 PathProgramCache]: Analyzing trace with hash -601579469, now seen corresponding path program 3 times [2022-01-31 21:31:30,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:30,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817908287] [2022-01-31 21:31:30,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:30,735 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:30,763 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:30,763 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:30,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:30,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:30,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:30,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:30,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:30,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:30,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:30,897 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:30,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817908287] [2022-01-31 21:31:30,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [817908287] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:30,898 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:30,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:31:30,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693468666] [2022-01-31 21:31:30,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:30,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:31:30,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:30,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:31:30,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:31:30,898 INFO L87 Difference]: Start difference. First operand 196 states and 237 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:31,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:31,085 INFO L93 Difference]: Finished difference Result 362 states and 446 transitions. [2022-01-31 21:31:31,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:31:31,085 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2022-01-31 21:31:31,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:31,086 INFO L225 Difference]: With dead ends: 362 [2022-01-31 21:31:31,086 INFO L226 Difference]: Without dead ends: 248 [2022-01-31 21:31:31,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:31:31,087 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 59 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:31,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 33 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:31:31,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-01-31 21:31:31,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 223. [2022-01-31 21:31:31,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 208 states have (on average 1.2019230769230769) internal successors, (250), 211 states have internal predecessors, (250), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:31,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 267 transitions. [2022-01-31 21:31:31,143 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 267 transitions. Word has length 51 [2022-01-31 21:31:31,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:31,143 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 267 transitions. [2022-01-31 21:31:31,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 12 states have internal predecessors, (38), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:31,144 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 267 transitions. [2022-01-31 21:31:31,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:31,144 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:31,144 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:31,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:31:31,144 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:31,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:31,144 INFO L85 PathProgramCache]: Analyzing trace with hash 679090812, now seen corresponding path program 37 times [2022-01-31 21:31:31,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:31,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081295445] [2022-01-31 21:31:31,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:31,191 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:31,236 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:31,236 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:31,269 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:31,309 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:31,309 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:31,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:31,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:31,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:31,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:31,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:31,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:31,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:32,001 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:32,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081295445] [2022-01-31 21:31:32,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2081295445] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:32,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:32,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:31:32,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626944905] [2022-01-31 21:31:32,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:32,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:31:32,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:32,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:31:32,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:31:32,002 INFO L87 Difference]: Start difference. First operand 223 states and 267 transitions. Second operand has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:32,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:32,358 INFO L93 Difference]: Finished difference Result 389 states and 466 transitions. [2022-01-31 21:31:32,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:31:32,358 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:32,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:32,359 INFO L225 Difference]: With dead ends: 389 [2022-01-31 21:31:32,359 INFO L226 Difference]: Without dead ends: 257 [2022-01-31 21:31:32,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:32,360 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 46 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 941 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:32,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 56 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 941 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:31:32,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2022-01-31 21:31:32,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 226. [2022-01-31 21:31:32,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:32,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:32,418 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:32,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:32,418 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:32,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:32,418 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:32,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:32,419 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:32,419 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:32,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:31:32,419 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:32,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:32,419 INFO L85 PathProgramCache]: Analyzing trace with hash -164914690, now seen corresponding path program 38 times [2022-01-31 21:31:32,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:32,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090564783] [2022-01-31 21:31:32,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:32,457 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:32,485 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:32,485 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:32,510 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:32,534 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:32,534 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:32,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:32,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:32,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:32,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:32,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:32,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:32,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:33,216 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:33,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090564783] [2022-01-31 21:31:33,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2090564783] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:33,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:33,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:31:33,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902271154] [2022-01-31 21:31:33,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:33,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:31:33,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:33,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:31:33,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:33,217 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:33,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:33,667 INFO L93 Difference]: Finished difference Result 392 states and 469 transitions. [2022-01-31 21:31:33,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:31:33,668 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:33,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:33,668 INFO L225 Difference]: With dead ends: 392 [2022-01-31 21:31:33,669 INFO L226 Difference]: Without dead ends: 260 [2022-01-31 21:31:33,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:33,669 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1164 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:33,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 74 Invalid, 1175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1164 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:33,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-01-31 21:31:33,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 226. [2022-01-31 21:31:33,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:33,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:33,730 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:33,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:33,730 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:33,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:33,730 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:33,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:33,730 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:33,731 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:33,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:31:33,731 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:33,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:33,731 INFO L85 PathProgramCache]: Analyzing trace with hash 109844924, now seen corresponding path program 39 times [2022-01-31 21:31:33,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:33,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264731052] [2022-01-31 21:31:33,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:33,767 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:33,804 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:33,805 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:33,853 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:33,897 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:33,897 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:33,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:34,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:34,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:34,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:34,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:34,010 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:34,629 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:34,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264731052] [2022-01-31 21:31:34,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [264731052] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:34,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:34,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:34,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219533378] [2022-01-31 21:31:34,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:34,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:34,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:34,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:34,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:34,630 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:35,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:35,050 INFO L93 Difference]: Finished difference Result 389 states and 466 transitions. [2022-01-31 21:31:35,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:35,050 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:35,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:35,051 INFO L225 Difference]: With dead ends: 389 [2022-01-31 21:31:35,051 INFO L226 Difference]: Without dead ends: 257 [2022-01-31 21:31:35,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=755, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:35,052 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1041 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:35,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 61 Invalid, 1052 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1041 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:35,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2022-01-31 21:31:35,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 226. [2022-01-31 21:31:35,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:35,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:35,115 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:35,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:35,115 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:35,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:35,116 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:35,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:35,116 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:35,116 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:35,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:31:35,116 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:35,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:35,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1496048318, now seen corresponding path program 40 times [2022-01-31 21:31:35,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:35,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404764289] [2022-01-31 21:31:35,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:35,154 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,199 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,199 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:35,259 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,297 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,297 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:35,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:35,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:35,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:35,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:35,406 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:35,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:35,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:36,019 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:36,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404764289] [2022-01-31 21:31:36,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [404764289] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:36,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:36,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:31:36,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849482987] [2022-01-31 21:31:36,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:36,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:31:36,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:36,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:31:36,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:36,021 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:36,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:36,472 INFO L93 Difference]: Finished difference Result 386 states and 463 transitions. [2022-01-31 21:31:36,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:31:36,472 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:36,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:36,473 INFO L225 Difference]: With dead ends: 386 [2022-01-31 21:31:36,473 INFO L226 Difference]: Without dead ends: 254 [2022-01-31 21:31:36,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=808, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:36,474 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:36,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 74 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:36,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-01-31 21:31:36,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 226. [2022-01-31 21:31:36,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:36,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:36,538 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:36,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:36,538 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:36,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:36,538 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:36,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:36,539 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:36,539 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:36,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:31:36,539 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:36,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:36,539 INFO L85 PathProgramCache]: Analyzing trace with hash 1558087932, now seen corresponding path program 41 times [2022-01-31 21:31:36,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:36,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331803596] [2022-01-31 21:31:36,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:36,589 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:36,624 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:36,624 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:36,683 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:36,718 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:36,718 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:36,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:36,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:36,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:36,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:36,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:36,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:36,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:37,310 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:37,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331803596] [2022-01-31 21:31:37,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [331803596] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:37,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:37,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:31:37,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123804337] [2022-01-31 21:31:37,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:37,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:31:37,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:37,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:31:37,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:37,311 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:37,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:37,694 INFO L93 Difference]: Finished difference Result 383 states and 460 transitions. [2022-01-31 21:31:37,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:31:37,694 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:37,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:37,695 INFO L225 Difference]: With dead ends: 383 [2022-01-31 21:31:37,695 INFO L226 Difference]: Without dead ends: 251 [2022-01-31 21:31:37,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:37,695 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:37,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 70 Invalid, 1247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1237 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:37,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-01-31 21:31:37,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 226. [2022-01-31 21:31:37,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:37,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:37,759 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:37,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:37,759 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:37,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.6428571428571428) internal successors, (46), 26 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:37,759 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:37,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:37,760 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:37,760 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:37,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:31:37,760 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:37,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:37,760 INFO L85 PathProgramCache]: Analyzing trace with hash -247350402, now seen corresponding path program 42 times [2022-01-31 21:31:37,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:37,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65701694] [2022-01-31 21:31:37,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:37,790 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:37,817 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:37,818 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:37,839 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:37,866 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:37,866 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:37,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:37,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:37,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:37,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:37,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:37,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:37,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:38,366 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:38,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65701694] [2022-01-31 21:31:38,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [65701694] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:38,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:38,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:31:38,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781777482] [2022-01-31 21:31:38,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:38,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:31:38,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:38,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:31:38,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:38,367 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:38,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:38,885 INFO L93 Difference]: Finished difference Result 380 states and 457 transitions. [2022-01-31 21:31:38,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:31:38,885 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:38,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:38,886 INFO L225 Difference]: With dead ends: 380 [2022-01-31 21:31:38,886 INFO L226 Difference]: Without dead ends: 248 [2022-01-31 21:31:38,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:31:38,886 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 1528 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:38,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 78 Invalid, 1539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1528 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:38,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-01-31 21:31:38,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 226. [2022-01-31 21:31:38,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:38,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:38,960 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:38,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:38,960 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:38,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:38,960 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:38,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:38,961 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:38,961 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:38,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-01-31 21:31:38,961 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:38,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:38,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1064998852, now seen corresponding path program 43 times [2022-01-31 21:31:38,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:38,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964907393] [2022-01-31 21:31:38,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:38,993 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:39,041 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:39,041 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:39,071 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:39,101 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:39,101 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:39,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:39,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:39,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:39,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:39,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:39,890 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:39,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964907393] [2022-01-31 21:31:39,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [964907393] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:39,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:39,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:31:39,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358085516] [2022-01-31 21:31:39,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:39,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:31:39,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:39,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:31:39,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=859, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:39,893 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:40,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:40,302 INFO L93 Difference]: Finished difference Result 377 states and 454 transitions. [2022-01-31 21:31:40,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:31:40,302 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:40,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:40,303 INFO L225 Difference]: With dead ends: 377 [2022-01-31 21:31:40,303 INFO L226 Difference]: Without dead ends: 245 [2022-01-31 21:31:40,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:31:40,304 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 1309 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:40,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 65 Invalid, 1320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:40,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-01-31 21:31:40,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 226. [2022-01-31 21:31:40,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:40,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:40,369 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:40,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:40,370 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:40,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 28 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:40,370 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:40,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:40,370 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:40,370 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:40,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-01-31 21:31:40,370 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:40,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:40,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1641620542, now seen corresponding path program 44 times [2022-01-31 21:31:40,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:40,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250916651] [2022-01-31 21:31:40,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:40,436 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:40,464 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:40,464 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:40,501 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:40,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:40,543 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:40,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:40,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:40,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:40,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:40,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:40,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:40,622 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:41,069 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:41,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250916651] [2022-01-31 21:31:41,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [250916651] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:41,070 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:41,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:31:41,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450195607] [2022-01-31 21:31:41,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:41,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:31:41,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:41,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:31:41,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=916, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:31:41,071 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:41,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:41,602 INFO L93 Difference]: Finished difference Result 375 states and 452 transitions. [2022-01-31 21:31:41,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:31:41,602 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:41,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:41,603 INFO L225 Difference]: With dead ends: 375 [2022-01-31 21:31:41,603 INFO L226 Difference]: Without dead ends: 243 [2022-01-31 21:31:41,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:31:41,604 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 1536 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:41,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 86 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1536 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:41,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2022-01-31 21:31:41,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 226. [2022-01-31 21:31:41,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 211 states have (on average 1.1990521327014219) internal successors, (253), 214 states have internal predecessors, (253), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:41,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 270 transitions. [2022-01-31 21:31:41,668 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 270 transitions. Word has length 52 [2022-01-31 21:31:41,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:41,669 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 270 transitions. [2022-01-31 21:31:41,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:41,669 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 270 transitions. [2022-01-31 21:31:41,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:31:41,669 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:41,669 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:41,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-01-31 21:31:41,669 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:41,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:41,670 INFO L85 PathProgramCache]: Analyzing trace with hash 630503292, now seen corresponding path program 45 times [2022-01-31 21:31:41,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:41,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379942143] [2022-01-31 21:31:41,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:41,698 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:41,698 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:41,728 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:41,768 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:41,768 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:41,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:41,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:41,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:41,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:41,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:41,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:41,883 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:42,456 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:42,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379942143] [2022-01-31 21:31:42,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [379942143] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:42,456 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:42,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:31:42,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037033805] [2022-01-31 21:31:42,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:42,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:31:42,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:42,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:31:42,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:31:42,457 INFO L87 Difference]: Start difference. First operand 226 states and 270 transitions. Second operand has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:42,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:42,928 INFO L93 Difference]: Finished difference Result 386 states and 467 transitions. [2022-01-31 21:31:42,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:31:42,928 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-01-31 21:31:42,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:42,929 INFO L225 Difference]: With dead ends: 386 [2022-01-31 21:31:42,930 INFO L226 Difference]: Without dead ends: 243 [2022-01-31 21:31:42,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=157, Invalid=1103, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:31:42,939 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:42,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 78 Invalid, 1526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:42,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2022-01-31 21:31:43,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 229. [2022-01-31 21:31:43,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 214 states have (on average 1.2009345794392523) internal successors, (257), 217 states have internal predecessors, (257), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:43,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 274 transitions. [2022-01-31 21:31:43,041 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 274 transitions. Word has length 52 [2022-01-31 21:31:43,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:43,041 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 274 transitions. [2022-01-31 21:31:43,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.4375) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:43,041 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 274 transitions. [2022-01-31 21:31:43,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:43,041 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:43,048 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:43,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-01-31 21:31:43,048 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:43,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:43,048 INFO L85 PathProgramCache]: Analyzing trace with hash -2013376257, now seen corresponding path program 46 times [2022-01-31 21:31:43,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:43,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849986433] [2022-01-31 21:31:43,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:43,079 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:43,103 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:43,103 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:43,126 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:43,157 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:43,157 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:43,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:43,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:43,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:43,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:43,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:43,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:43,284 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:43,723 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:43,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849986433] [2022-01-31 21:31:43,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1849986433] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:43,723 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:43,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:31:43,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651212823] [2022-01-31 21:31:43,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:43,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:31:43,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:43,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:31:43,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:31:43,725 INFO L87 Difference]: Start difference. First operand 229 states and 274 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:44,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:44,179 INFO L93 Difference]: Finished difference Result 398 states and 476 transitions. [2022-01-31 21:31:44,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:31:44,180 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:44,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:44,181 INFO L225 Difference]: With dead ends: 398 [2022-01-31 21:31:44,181 INFO L226 Difference]: Without dead ends: 266 [2022-01-31 21:31:44,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:44,208 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1281 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:44,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 72 Invalid, 1292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1281 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:44,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2022-01-31 21:31:44,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 232. [2022-01-31 21:31:44,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:44,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:44,310 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:44,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:44,310 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:44,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:44,310 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:44,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:44,310 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:44,311 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:44,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-01-31 21:31:44,312 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:44,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:44,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1252231741, now seen corresponding path program 47 times [2022-01-31 21:31:44,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:44,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159208013] [2022-01-31 21:31:44,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:44,335 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:44,362 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:44,362 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:44,392 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:44,419 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:44,419 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:44,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:44,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:44,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:44,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:44,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:44,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:44,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:45,239 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:45,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159208013] [2022-01-31 21:31:45,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [159208013] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:45,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:45,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:45,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96061734] [2022-01-31 21:31:45,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:45,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:45,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:45,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:45,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:45,241 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:45,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:45,680 INFO L93 Difference]: Finished difference Result 401 states and 479 transitions. [2022-01-31 21:31:45,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:45,680 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:45,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:45,681 INFO L225 Difference]: With dead ends: 401 [2022-01-31 21:31:45,681 INFO L226 Difference]: Without dead ends: 269 [2022-01-31 21:31:45,681 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:45,681 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1068 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1078 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:45,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 56 Invalid, 1078 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1068 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:45,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2022-01-31 21:31:45,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 232. [2022-01-31 21:31:45,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:45,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:45,768 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:45,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:45,768 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:45,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:45,768 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:45,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:45,768 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:45,769 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:45,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-01-31 21:31:45,769 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:45,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:45,769 INFO L85 PathProgramCache]: Analyzing trace with hash 408226239, now seen corresponding path program 48 times [2022-01-31 21:31:45,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:45,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43362427] [2022-01-31 21:31:45,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:45,796 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:45,817 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:45,817 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:45,846 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:45,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:45,876 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:45,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:45,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:45,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:45,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:45,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:45,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:45,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:46,656 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:46,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43362427] [2022-01-31 21:31:46,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [43362427] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:46,656 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:46,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:31:46,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450921764] [2022-01-31 21:31:46,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:46,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:31:46,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:46,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:31:46,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=703, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:31:46,657 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:47,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:47,152 INFO L93 Difference]: Finished difference Result 398 states and 476 transitions. [2022-01-31 21:31:47,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:31:47,152 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:47,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:47,153 INFO L225 Difference]: With dead ends: 398 [2022-01-31 21:31:47,153 INFO L226 Difference]: Without dead ends: 266 [2022-01-31 21:31:47,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:47,154 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1180 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:47,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 59 Invalid, 1191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1180 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:47,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2022-01-31 21:31:47,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 232. [2022-01-31 21:31:47,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:47,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:47,236 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:47,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:47,236 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:47,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:47,236 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:47,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:47,237 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:47,237 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:47,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-01-31 21:31:47,237 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:47,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:47,238 INFO L85 PathProgramCache]: Analyzing trace with hash 682985853, now seen corresponding path program 49 times [2022-01-31 21:31:47,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:47,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103128126] [2022-01-31 21:31:47,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:47,272 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:47,302 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:47,303 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:47,332 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:47,360 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:47,360 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:47,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:47,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:47,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:47,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:47,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:47,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:47,968 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:47,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103128126] [2022-01-31 21:31:47,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [103128126] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:47,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:47,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:31:47,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122942085] [2022-01-31 21:31:47,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:47,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:31:47,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:47,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:31:47,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=754, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:47,970 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:48,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:48,391 INFO L93 Difference]: Finished difference Result 395 states and 473 transitions. [2022-01-31 21:31:48,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:31:48,391 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:48,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:48,392 INFO L225 Difference]: With dead ends: 395 [2022-01-31 21:31:48,392 INFO L226 Difference]: Without dead ends: 263 [2022-01-31 21:31:48,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=126, Invalid=866, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:48,393 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 63 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:48,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 59 Invalid, 1086 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1075 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:48,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-01-31 21:31:48,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 232. [2022-01-31 21:31:48,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:48,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:48,484 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:48,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:48,484 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:48,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:48,485 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:48,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:48,485 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:48,485 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:48,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-01-31 21:31:48,485 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:48,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:48,486 INFO L85 PathProgramCache]: Analyzing trace with hash 2069189247, now seen corresponding path program 50 times [2022-01-31 21:31:48,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:48,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777483931] [2022-01-31 21:31:48,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:48,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:48,553 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:48,553 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:48,575 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:48,603 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:48,603 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:48,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:48,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:48,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:48,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:48,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:48,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:48,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:49,418 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:49,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777483931] [2022-01-31 21:31:49,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [777483931] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:49,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:49,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:31:49,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254086488] [2022-01-31 21:31:49,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:49,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:31:49,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:49,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:31:49,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:31:49,419 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:49,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:49,964 INFO L93 Difference]: Finished difference Result 392 states and 470 transitions. [2022-01-31 21:31:49,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:31:49,964 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:49,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:49,965 INFO L225 Difference]: With dead ends: 392 [2022-01-31 21:31:49,965 INFO L226 Difference]: Without dead ends: 260 [2022-01-31 21:31:49,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:31:49,966 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1348 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:49,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 72 Invalid, 1359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1348 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:49,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-01-31 21:31:50,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 232. [2022-01-31 21:31:50,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:50,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:50,051 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:50,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:50,051 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:50,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:50,051 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:50,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:50,051 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:50,051 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:50,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-01-31 21:31:50,051 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:50,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:50,052 INFO L85 PathProgramCache]: Analyzing trace with hash 2131228861, now seen corresponding path program 51 times [2022-01-31 21:31:50,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:50,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100142805] [2022-01-31 21:31:50,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:50,101 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:50,143 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:50,143 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:50,177 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:50,241 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:50,241 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:50,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:50,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:50,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:50,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:50,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:50,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:50,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:51,040 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:51,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100142805] [2022-01-31 21:31:51,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1100142805] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:51,040 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:51,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:31:51,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297275432] [2022-01-31 21:31:51,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:51,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:31:51,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:51,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:31:51,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:31:51,041 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:51,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:51,484 INFO L93 Difference]: Finished difference Result 389 states and 467 transitions. [2022-01-31 21:31:51,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:31:51,484 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:51,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:51,485 INFO L225 Difference]: With dead ends: 389 [2022-01-31 21:31:51,485 INFO L226 Difference]: Without dead ends: 257 [2022-01-31 21:31:51,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:31:51,486 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 1346 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:51,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 67 Invalid, 1357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1346 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:51,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2022-01-31 21:31:51,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 232. [2022-01-31 21:31:51,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:51,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:51,573 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:51,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:51,573 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:51,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 28 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:51,573 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:51,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:51,573 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:51,574 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:51,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-01-31 21:31:51,574 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:51,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:51,574 INFO L85 PathProgramCache]: Analyzing trace with hash 325790527, now seen corresponding path program 52 times [2022-01-31 21:31:51,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:51,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1853904577] [2022-01-31 21:31:51,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:51,604 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:51,632 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:51,632 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:51,661 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:51,681 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:51,681 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:51,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:51,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:51,755 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:51,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:51,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:51,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:51,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:52,244 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:52,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1853904577] [2022-01-31 21:31:52,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1853904577] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:52,244 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:52,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:31:52,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231851210] [2022-01-31 21:31:52,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:52,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:31:52,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:52,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:31:52,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:31:52,249 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:52,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:52,661 INFO L93 Difference]: Finished difference Result 386 states and 464 transitions. [2022-01-31 21:31:52,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:31:52,661 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:52,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:52,662 INFO L225 Difference]: With dead ends: 386 [2022-01-31 21:31:52,662 INFO L226 Difference]: Without dead ends: 254 [2022-01-31 21:31:52,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=147, Invalid=1043, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:31:52,663 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 1350 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:52,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 58 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1350 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:31:52,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-01-31 21:31:52,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 232. [2022-01-31 21:31:52,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:52,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:52,759 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:52,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:52,760 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:52,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 29 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:52,760 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:52,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:52,760 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:52,760 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:52,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-01-31 21:31:52,760 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:52,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:52,760 INFO L85 PathProgramCache]: Analyzing trace with hash -491857923, now seen corresponding path program 53 times [2022-01-31 21:31:52,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:52,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799143212] [2022-01-31 21:31:52,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:52,794 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:52,820 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:52,820 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:52,842 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:52,869 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:52,869 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:52,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:52,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:52,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:52,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:52,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:52,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:52,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:53,430 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:53,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799143212] [2022-01-31 21:31:53,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [799143212] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:53,431 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:53,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:31:53,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800403206] [2022-01-31 21:31:53,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:53,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:31:53,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:53,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:31:53,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:31:53,432 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:54,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:54,101 INFO L93 Difference]: Finished difference Result 383 states and 461 transitions. [2022-01-31 21:31:54,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:31:54,101 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:54,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:54,102 INFO L225 Difference]: With dead ends: 383 [2022-01-31 21:31:54,102 INFO L226 Difference]: Without dead ends: 251 [2022-01-31 21:31:54,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:31:54,102 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 1677 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:54,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 84 Invalid, 1687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1677 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:31:54,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-01-31 21:31:54,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 232. [2022-01-31 21:31:54,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:54,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:54,190 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:54,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:54,190 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:54,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 30 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:54,190 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:54,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:54,191 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:54,191 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:54,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-01-31 21:31:54,191 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:54,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:54,191 INFO L85 PathProgramCache]: Analyzing trace with hash -2080205825, now seen corresponding path program 54 times [2022-01-31 21:31:54,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:54,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1316458251] [2022-01-31 21:31:54,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:54,238 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:54,282 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:54,283 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:54,327 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:54,368 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:54,369 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:54,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:54,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:54,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:54,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:54,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:54,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:54,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:55,232 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:55,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1316458251] [2022-01-31 21:31:55,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1316458251] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:55,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:55,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:31:55,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45139702] [2022-01-31 21:31:55,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:55,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:31:55,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:55,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:31:55,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:31:55,233 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:55,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:55,723 INFO L93 Difference]: Finished difference Result 381 states and 459 transitions. [2022-01-31 21:31:55,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:31:55,723 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:55,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:55,724 INFO L225 Difference]: With dead ends: 381 [2022-01-31 21:31:55,724 INFO L226 Difference]: Without dead ends: 249 [2022-01-31 21:31:55,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:31:55,725 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1684 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:55,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 70 Invalid, 1694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1684 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:55,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2022-01-31 21:31:55,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 232. [2022-01-31 21:31:55,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.1981566820276497) internal successors, (260), 220 states have internal predecessors, (260), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:55,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 277 transitions. [2022-01-31 21:31:55,820 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 277 transitions. Word has length 55 [2022-01-31 21:31:55,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:55,820 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 277 transitions. [2022-01-31 21:31:55,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.4848484848484849) internal successors, (49), 31 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:55,820 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 277 transitions. [2022-01-31 21:31:55,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:31:55,821 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:55,821 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:55,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-01-31 21:31:55,821 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:55,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:55,821 INFO L85 PathProgramCache]: Analyzing trace with hash 1203644221, now seen corresponding path program 55 times [2022-01-31 21:31:55,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:55,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515940754] [2022-01-31 21:31:55,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:55,879 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:55,879 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:31:55,916 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:55,962 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:55,962 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:55,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:55,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:56,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:56,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:56,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:56,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:56,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:56,856 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:56,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515940754] [2022-01-31 21:31:56,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [515940754] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:56,856 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:56,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:31:56,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47434452] [2022-01-31 21:31:56,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:56,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:31:56,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:56,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:31:56,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:31:56,857 INFO L87 Difference]: Start difference. First operand 232 states and 277 transitions. Second operand has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:57,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:57,519 INFO L93 Difference]: Finished difference Result 392 states and 474 transitions. [2022-01-31 21:31:57,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:31:57,520 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-01-31 21:31:57,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:57,520 INFO L225 Difference]: With dead ends: 392 [2022-01-31 21:31:57,520 INFO L226 Difference]: Without dead ends: 249 [2022-01-31 21:31:57,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=168, Invalid=1238, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:31:57,521 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1604 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:57,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 75 Invalid, 1614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1604 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:31:57,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2022-01-31 21:31:57,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 235. [2022-01-31 21:31:57,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 220 states have (on average 1.2) internal successors, (264), 223 states have internal predecessors, (264), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:57,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 281 transitions. [2022-01-31 21:31:57,610 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 281 transitions. Word has length 55 [2022-01-31 21:31:57,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:57,610 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 281 transitions. [2022-01-31 21:31:57,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 32 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:57,610 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 281 transitions. [2022-01-31 21:31:57,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-01-31 21:31:57,611 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:57,611 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:57,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-01-31 21:31:57,611 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:57,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:57,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1847626205, now seen corresponding path program 4 times [2022-01-31 21:31:57,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:57,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877110188] [2022-01-31 21:31:57,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:57,681 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:57,756 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:57,756 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:57,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:57,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:57,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:57,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:57,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:57,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:57,903 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:57,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877110188] [2022-01-31 21:31:57,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [877110188] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:57,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:57,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-01-31 21:31:57,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395725067] [2022-01-31 21:31:57,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:57,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-31 21:31:57,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:57,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-31 21:31:57,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=146, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:31:57,904 INFO L87 Difference]: Start difference. First operand 235 states and 281 transitions. Second operand has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:58,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:58,144 INFO L93 Difference]: Finished difference Result 431 states and 523 transitions. [2022-01-31 21:31:58,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:31:58,145 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2022-01-31 21:31:58,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:58,145 INFO L225 Difference]: With dead ends: 431 [2022-01-31 21:31:58,145 INFO L226 Difference]: Without dead ends: 290 [2022-01-31 21:31:58,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 24 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:31:58,146 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 74 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:58,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 29 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:31:58,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2022-01-31 21:31:58,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 262. [2022-01-31 21:31:58,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 247 states have (on average 1.1902834008097165) internal successors, (294), 250 states have internal predecessors, (294), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:58,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 311 transitions. [2022-01-31 21:31:58,245 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 311 transitions. Word has length 57 [2022-01-31 21:31:58,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:58,245 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 311 transitions. [2022-01-31 21:31:58,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 14 states have internal predecessors, (44), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:31:58,245 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 311 transitions. [2022-01-31 21:31:58,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:31:58,245 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:58,245 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:58,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-01-31 21:31:58,245 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:58,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:58,246 INFO L85 PathProgramCache]: Analyzing trace with hash -490608740, now seen corresponding path program 56 times [2022-01-31 21:31:58,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:58,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497895319] [2022-01-31 21:31:58,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:58,279 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:58,323 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:58,324 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:58,369 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:58,412 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:58,413 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:58,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:58,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:58,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:58,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:58,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:31:58,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:58,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:59,253 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:59,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497895319] [2022-01-31 21:31:59,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1497895319] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:59,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:59,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:31:59,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79734719] [2022-01-31 21:31:59,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:59,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:31:59,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:59,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:31:59,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:31:59,254 INFO L87 Difference]: Start difference. First operand 262 states and 311 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:59,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:59,849 INFO L93 Difference]: Finished difference Result 464 states and 549 transitions. [2022-01-31 21:31:59,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:31:59,849 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:31:59,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:59,850 INFO L225 Difference]: With dead ends: 464 [2022-01-31 21:31:59,850 INFO L226 Difference]: Without dead ends: 305 [2022-01-31 21:31:59,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:31:59,851 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1247 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:59,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 61 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1247 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:31:59,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-01-31 21:31:59,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 265. [2022-01-31 21:31:59,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:31:59,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:31:59,953 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:31:59,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:59,953 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:31:59,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:31:59,953 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:31:59,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:31:59,954 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:59,954 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:59,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-01-31 21:31:59,954 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:59,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:59,954 INFO L85 PathProgramCache]: Analyzing trace with hash -66962018, now seen corresponding path program 57 times [2022-01-31 21:31:59,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:59,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19761647] [2022-01-31 21:31:59,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:00,004 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:00,055 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:00,055 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:00,088 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:00,129 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:00,129 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:00,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:00,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:00,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:00,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:00,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:00,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:00,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:00,976 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:00,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19761647] [2022-01-31 21:32:00,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [19761647] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:00,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:00,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:32:00,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191018784] [2022-01-31 21:32:00,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:00,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:32:00,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:00,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:32:00,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:32:00,978 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:01,630 INFO L93 Difference]: Finished difference Result 467 states and 552 transitions. [2022-01-31 21:32:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:32:01,631 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:01,632 INFO L225 Difference]: With dead ends: 467 [2022-01-31 21:32:01,632 INFO L226 Difference]: Without dead ends: 308 [2022-01-31 21:32:01,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:32:01,632 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1319 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:01,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 70 Invalid, 1330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:01,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2022-01-31 21:32:01,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 265. [2022-01-31 21:32:01,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:01,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:01,751 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:01,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:01,751 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:01,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:01,751 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:01,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:01,752 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:01,752 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:01,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-01-31 21:32:01,752 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:01,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:01,757 INFO L85 PathProgramCache]: Analyzing trace with hash -1096321316, now seen corresponding path program 58 times [2022-01-31 21:32:01,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:01,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423558092] [2022-01-31 21:32:01,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:01,806 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:01,843 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:01,843 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:01,890 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:01,934 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:01,934 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:01,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:02,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:02,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:02,074 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:02,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:02,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:02,722 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:02,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423558092] [2022-01-31 21:32:02,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [423558092] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:02,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:02,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:32:02,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770027807] [2022-01-31 21:32:02,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:02,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:32:02,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:02,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:32:02,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:32:02,723 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:03,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:03,299 INFO L93 Difference]: Finished difference Result 464 states and 549 transitions. [2022-01-31 21:32:03,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:32:03,299 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:03,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:03,300 INFO L225 Difference]: With dead ends: 464 [2022-01-31 21:32:03,300 INFO L226 Difference]: Without dead ends: 305 [2022-01-31 21:32:03,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:03,300 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 1502 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:03,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 77 Invalid, 1513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:03,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-01-31 21:32:03,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 265. [2022-01-31 21:32:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:03,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:03,419 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:03,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:03,419 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:03,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:03,419 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:03,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:03,420 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:03,420 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:03,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-01-31 21:32:03,420 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:03,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:03,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1940326818, now seen corresponding path program 59 times [2022-01-31 21:32:03,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:03,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69393694] [2022-01-31 21:32:03,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:03,450 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:03,477 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:03,478 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:03,499 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:03,525 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:03,526 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:03,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:03,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:03,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:03,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:03,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:03,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:03,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:04,159 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:04,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69393694] [2022-01-31 21:32:04,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [69393694] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:04,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:04,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:32:04,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745732808] [2022-01-31 21:32:04,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:04,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:32:04,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:04,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:32:04,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=810, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:32:04,173 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:04,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:04,739 INFO L93 Difference]: Finished difference Result 461 states and 546 transitions. [2022-01-31 21:32:04,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:32:04,740 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:04,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:04,740 INFO L225 Difference]: With dead ends: 461 [2022-01-31 21:32:04,740 INFO L226 Difference]: Without dead ends: 302 [2022-01-31 21:32:04,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=130, Invalid=926, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:04,746 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 1575 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 1586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:04,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 81 Invalid, 1586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1575 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:04,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-01-31 21:32:04,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 265. [2022-01-31 21:32:04,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:04,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:04,868 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:04,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:04,868 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:04,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:04,868 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:04,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:04,868 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:04,868 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:04,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-01-31 21:32:04,869 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:04,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:04,869 INFO L85 PathProgramCache]: Analyzing trace with hash -1665567204, now seen corresponding path program 60 times [2022-01-31 21:32:04,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:04,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181874293] [2022-01-31 21:32:04,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:04,899 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,919 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,920 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:04,942 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,971 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,971 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:04,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:04,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:05,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:05,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:05,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:05,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:05,554 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:05,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181874293] [2022-01-31 21:32:05,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [181874293] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:05,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:05,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:32:05,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471950107] [2022-01-31 21:32:05,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:05,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:32:05,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:05,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:32:05,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:05,555 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:06,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:06,120 INFO L93 Difference]: Finished difference Result 458 states and 543 transitions. [2022-01-31 21:32:06,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:32:06,120 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:06,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:06,121 INFO L225 Difference]: With dead ends: 458 [2022-01-31 21:32:06,121 INFO L226 Difference]: Without dead ends: 299 [2022-01-31 21:32:06,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=985, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:06,122 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1599 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:06,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 70 Invalid, 1610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1599 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:06,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-01-31 21:32:06,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 265. [2022-01-31 21:32:06,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:06,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:06,251 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:06,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:06,251 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:06,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:06,251 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:06,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:06,273 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:06,273 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:06,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-01-31 21:32:06,274 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:06,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:06,274 INFO L85 PathProgramCache]: Analyzing trace with hash -279363810, now seen corresponding path program 61 times [2022-01-31 21:32:06,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:06,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434283386] [2022-01-31 21:32:06,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:06,307 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:06,334 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:06,335 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:06,366 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:06,395 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:06,396 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:06,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:06,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:06,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:06,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:06,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:06,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:06,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:07,013 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:07,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434283386] [2022-01-31 21:32:07,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [434283386] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:07,014 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:07,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:32:07,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660448194] [2022-01-31 21:32:07,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:07,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:32:07,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:07,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:32:07,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=922, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:07,015 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:07,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:07,596 INFO L93 Difference]: Finished difference Result 455 states and 540 transitions. [2022-01-31 21:32:07,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:32:07,596 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:07,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:07,597 INFO L225 Difference]: With dead ends: 455 [2022-01-31 21:32:07,597 INFO L226 Difference]: Without dead ends: 296 [2022-01-31 21:32:07,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:07,598 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1512 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 1523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:07,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 62 Invalid, 1523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1512 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:07,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2022-01-31 21:32:07,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 265. [2022-01-31 21:32:07,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:07,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:07,731 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:07,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:07,731 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:07,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:07,731 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:07,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:07,732 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:07,732 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:07,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-01-31 21:32:07,732 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:07,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:07,732 INFO L85 PathProgramCache]: Analyzing trace with hash -217324196, now seen corresponding path program 62 times [2022-01-31 21:32:07,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:07,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113001504] [2022-01-31 21:32:07,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:07,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:07,797 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:07,797 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:07,822 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:07,848 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:07,848 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:07,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:07,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:07,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:07,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:07,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:07,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:07,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:08,463 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:08,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113001504] [2022-01-31 21:32:08,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [113001504] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:08,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:08,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:32:08,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573882447] [2022-01-31 21:32:08,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:08,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:32:08,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:08,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:32:08,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:08,464 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:09,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:09,012 INFO L93 Difference]: Finished difference Result 452 states and 537 transitions. [2022-01-31 21:32:09,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:32:09,013 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:09,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:09,014 INFO L225 Difference]: With dead ends: 452 [2022-01-31 21:32:09,014 INFO L226 Difference]: Without dead ends: 293 [2022-01-31 21:32:09,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=151, Invalid=1109, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:09,014 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1657 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1657 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:09,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 74 Invalid, 1667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1657 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:09,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-01-31 21:32:09,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 265. [2022-01-31 21:32:09,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:09,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:09,142 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:09,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:09,142 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:09,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 30 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:09,142 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:09,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:09,142 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:09,142 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:09,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-01-31 21:32:09,143 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:09,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:09,143 INFO L85 PathProgramCache]: Analyzing trace with hash -2022762530, now seen corresponding path program 63 times [2022-01-31 21:32:09,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:09,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787430603] [2022-01-31 21:32:09,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:09,185 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:09,211 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:09,211 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:09,251 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:09,290 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:09,291 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:09,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:09,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:09,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:09,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:09,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:09,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:09,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:10,164 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:10,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787430603] [2022-01-31 21:32:10,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [787430603] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:10,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:10,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:32:10,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467261037] [2022-01-31 21:32:10,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:10,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:32:10,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:10,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:32:10,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1042, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:10,165 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:10,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:10,653 INFO L93 Difference]: Finished difference Result 449 states and 534 transitions. [2022-01-31 21:32:10,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:32:10,653 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:10,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:10,654 INFO L225 Difference]: With dead ends: 449 [2022-01-31 21:32:10,654 INFO L226 Difference]: Without dead ends: 290 [2022-01-31 21:32:10,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:10,655 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1378 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:10,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 56 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1378 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:10,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2022-01-31 21:32:10,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 265. [2022-01-31 21:32:10,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:10,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:10,780 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:10,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:10,780 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:10,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 31 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:10,780 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:10,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:10,780 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:10,780 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:10,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-01-31 21:32:10,781 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:10,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:10,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1454556316, now seen corresponding path program 64 times [2022-01-31 21:32:10,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:10,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984431208] [2022-01-31 21:32:10,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:10,810 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:10,837 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:10,837 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:10,858 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:10,886 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:10,886 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:10,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:10,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:10,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:10,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:10,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:10,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:11,607 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:11,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984431208] [2022-01-31 21:32:11,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1984431208] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:11,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:11,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:32:11,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683649543] [2022-01-31 21:32:11,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:11,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:32:11,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:11,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:32:11,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1105, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:11,609 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:12,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:12,309 INFO L93 Difference]: Finished difference Result 446 states and 531 transitions. [2022-01-31 21:32:12,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:32:12,309 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:12,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:12,310 INFO L225 Difference]: With dead ends: 446 [2022-01-31 21:32:12,310 INFO L226 Difference]: Without dead ends: 287 [2022-01-31 21:32:12,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=165, Invalid=1241, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:12,311 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1741 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:12,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 70 Invalid, 1752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1741 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:12,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2022-01-31 21:32:12,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 265. [2022-01-31 21:32:12,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:12,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:12,442 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:12,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:12,442 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:12,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:12,442 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:12,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:12,442 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:12,442 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:12,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-01-31 21:32:12,442 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:12,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:12,443 INFO L85 PathProgramCache]: Analyzing trace with hash -133791586, now seen corresponding path program 65 times [2022-01-31 21:32:12,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:12,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898528991] [2022-01-31 21:32:12,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:12,482 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,517 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,517 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:12,549 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,577 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,577 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:12,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:12,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:12,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:12,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:12,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:12,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:12,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:13,282 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:13,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898528991] [2022-01-31 21:32:13,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [898528991] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:13,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:13,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:32:13,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153103685] [2022-01-31 21:32:13,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:13,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:32:13,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:13,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:32:13,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:13,284 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:13,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:13,803 INFO L93 Difference]: Finished difference Result 444 states and 529 transitions. [2022-01-31 21:32:13,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:32:13,803 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:13,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:13,804 INFO L225 Difference]: With dead ends: 444 [2022-01-31 21:32:13,804 INFO L226 Difference]: Without dead ends: 285 [2022-01-31 21:32:13,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=172, Invalid=1310, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:32:13,804 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1429 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:13,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 56 Invalid, 1439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1429 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:13,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2022-01-31 21:32:13,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 265. [2022-01-31 21:32:13,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 250 states have (on average 1.188) internal successors, (297), 253 states have internal predecessors, (297), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:13,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 314 transitions. [2022-01-31 21:32:13,931 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 314 transitions. Word has length 58 [2022-01-31 21:32:13,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:13,932 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 314 transitions. [2022-01-31 21:32:13,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 33 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:13,932 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 314 transitions. [2022-01-31 21:32:13,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:32:13,932 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:13,932 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:13,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-01-31 21:32:13,932 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:13,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:13,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1144908836, now seen corresponding path program 66 times [2022-01-31 21:32:13,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:13,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815636511] [2022-01-31 21:32:13,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:13,966 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:13,967 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:32:13,988 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:14,017 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:14,017 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:14,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:14,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:14,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:14,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:14,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:14,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:14,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:14,635 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:14,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815636511] [2022-01-31 21:32:14,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1815636511] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:14,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:14,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:32:14,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909258806] [2022-01-31 21:32:14,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:14,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:32:14,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:14,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:32:14,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:14,636 INFO L87 Difference]: Start difference. First operand 265 states and 314 transitions. Second operand has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:15,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:15,266 INFO L93 Difference]: Finished difference Result 455 states and 544 transitions. [2022-01-31 21:32:15,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:32:15,266 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-01-31 21:32:15,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:15,267 INFO L225 Difference]: With dead ends: 455 [2022-01-31 21:32:15,267 INFO L226 Difference]: Without dead ends: 285 [2022-01-31 21:32:15,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:32:15,267 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2107 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:15,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 87 Invalid, 2119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2107 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:15,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2022-01-31 21:32:15,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 268. [2022-01-31 21:32:15,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 253 states have (on average 1.1897233201581028) internal successors, (301), 256 states have internal predecessors, (301), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:15,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 318 transitions. [2022-01-31 21:32:15,396 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 318 transitions. Word has length 58 [2022-01-31 21:32:15,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:15,396 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 318 transitions. [2022-01-31 21:32:15,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 34 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:15,396 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 318 transitions. [2022-01-31 21:32:15,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:15,396 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:15,396 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:15,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-01-31 21:32:15,397 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:15,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:15,397 INFO L85 PathProgramCache]: Analyzing trace with hash 831909855, now seen corresponding path program 67 times [2022-01-31 21:32:15,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:15,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244593311] [2022-01-31 21:32:15,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:15,427 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:15,454 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:15,454 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:15,513 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:15,547 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:15,547 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:15,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:15,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:15,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:15,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:15,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:15,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:15,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:16,453 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:16,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244593311] [2022-01-31 21:32:16,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [244593311] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:16,453 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:16,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:32:16,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923749051] [2022-01-31 21:32:16,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:16,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:32:16,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:16,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:32:16,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:32:16,454 INFO L87 Difference]: Start difference. First operand 268 states and 318 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:17,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:17,051 INFO L93 Difference]: Finished difference Result 473 states and 559 transitions. [2022-01-31 21:32:17,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:32:17,051 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:17,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:17,052 INFO L225 Difference]: With dead ends: 473 [2022-01-31 21:32:17,052 INFO L226 Difference]: Without dead ends: 314 [2022-01-31 21:32:17,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:32:17,053 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 43 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1430 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:17,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 74 Invalid, 1440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1430 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:32:17,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2022-01-31 21:32:17,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 271. [2022-01-31 21:32:17,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:17,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:17,191 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:17,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:17,191 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:17,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:17,191 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:17,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:17,192 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:17,192 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:17,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-01-31 21:32:17,192 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:17,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:17,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1217477987, now seen corresponding path program 68 times [2022-01-31 21:32:17,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:17,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981250422] [2022-01-31 21:32:17,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:17,223 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:17,250 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:17,251 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:17,272 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:17,292 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:17,293 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:17,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:17,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:17,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:17,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:17,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:17,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:17,912 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:17,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981250422] [2022-01-31 21:32:17,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [981250422] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:17,913 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:17,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:32:17,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765689696] [2022-01-31 21:32:17,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:17,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:32:17,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:17,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:32:17,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:32:17,913 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:18,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:18,695 INFO L93 Difference]: Finished difference Result 476 states and 562 transitions. [2022-01-31 21:32:18,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:32:18,695 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:18,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:18,696 INFO L225 Difference]: With dead ends: 476 [2022-01-31 21:32:18,696 INFO L226 Difference]: Without dead ends: 317 [2022-01-31 21:32:18,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:18,697 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 1477 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:18,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 65 Invalid, 1488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1477 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:18,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-01-31 21:32:18,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 271. [2022-01-31 21:32:18,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:18,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:18,846 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:18,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:18,846 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:18,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:18,846 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:18,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:18,847 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:18,847 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:18,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-01-31 21:32:18,847 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:18,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:18,847 INFO L85 PathProgramCache]: Analyzing trace with hash -793831265, now seen corresponding path program 69 times [2022-01-31 21:32:18,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:18,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045786472] [2022-01-31 21:32:18,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:18,894 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:18,929 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:18,929 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:18,963 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:18,994 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:18,994 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:18,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:18,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:19,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:19,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:19,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:19,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:19,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:19,808 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:19,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045786472] [2022-01-31 21:32:19,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1045786472] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:19,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:19,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:32:19,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107843785] [2022-01-31 21:32:19,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:19,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:32:19,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:19,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:32:19,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=813, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:32:19,809 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:20,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:20,572 INFO L93 Difference]: Finished difference Result 473 states and 559 transitions. [2022-01-31 21:32:20,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:32:20,572 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:20,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:20,573 INFO L225 Difference]: With dead ends: 473 [2022-01-31 21:32:20,573 INFO L226 Difference]: Without dead ends: 314 [2022-01-31 21:32:20,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=929, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:20,574 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 45 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 1525 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:20,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 78 Invalid, 1535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1525 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:20,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2022-01-31 21:32:20,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 271. [2022-01-31 21:32:20,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:20,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:20,723 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:20,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:20,723 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:20,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:20,723 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:20,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:20,724 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:20,724 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:20,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2022-01-31 21:32:20,724 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:20,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:20,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1823190563, now seen corresponding path program 70 times [2022-01-31 21:32:20,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:20,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221825043] [2022-01-31 21:32:20,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:20,759 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,804 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,804 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:20,839 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,872 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,873 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:20,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:20,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:20,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:20,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:20,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:20,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:20,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:21,820 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:21,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221825043] [2022-01-31 21:32:21,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1221825043] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:21,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:21,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:32:21,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523693115] [2022-01-31 21:32:21,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:21,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:32:21,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:21,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:32:21,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:21,821 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:22,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:22,637 INFO L93 Difference]: Finished difference Result 470 states and 556 transitions. [2022-01-31 21:32:22,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:32:22,637 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:22,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:22,638 INFO L225 Difference]: With dead ends: 470 [2022-01-31 21:32:22,638 INFO L226 Difference]: Without dead ends: 311 [2022-01-31 21:32:22,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:22,638 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 45 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 1608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:22,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 1608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1598 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:22,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2022-01-31 21:32:22,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 271. [2022-01-31 21:32:22,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:22,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:22,797 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:22,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:22,797 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:22,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:22,797 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:22,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:22,798 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:22,798 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:22,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2022-01-31 21:32:22,798 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:22,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:22,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1627771231, now seen corresponding path program 71 times [2022-01-31 21:32:22,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:22,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586283379] [2022-01-31 21:32:22,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:22,832 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:22,866 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:22,866 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:22,902 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:22,944 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:22,944 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:22,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:22,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:23,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:23,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:23,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:23,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:23,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:23,551 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:23,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586283379] [2022-01-31 21:32:23,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1586283379] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:23,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:23,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:32:23,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048967408] [2022-01-31 21:32:23,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:23,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:32:23,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:23,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:32:23,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=925, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:23,552 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:24,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:24,206 INFO L93 Difference]: Finished difference Result 467 states and 553 transitions. [2022-01-31 21:32:24,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:32:24,206 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:24,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:24,207 INFO L225 Difference]: With dead ends: 467 [2022-01-31 21:32:24,207 INFO L226 Difference]: Without dead ends: 308 [2022-01-31 21:32:24,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:24,207 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1676 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1676 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:24,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 70 Invalid, 1687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1676 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:24,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2022-01-31 21:32:24,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 271. [2022-01-31 21:32:24,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:24,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:24,361 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:24,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:24,362 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:24,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:24,362 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:24,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:24,362 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:24,362 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:24,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2022-01-31 21:32:24,362 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:24,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:24,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1902530845, now seen corresponding path program 72 times [2022-01-31 21:32:24,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:24,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270590396] [2022-01-31 21:32:24,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:24,393 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:24,442 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:24,442 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:24,486 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:24,526 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:24,526 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:24,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:24,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:24,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:24,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:24,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:24,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:24,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:25,440 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:25,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270590396] [2022-01-31 21:32:25,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270590396] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:25,440 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:25,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:32:25,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705929617] [2022-01-31 21:32:25,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:25,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:32:25,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:25,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:32:25,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:25,441 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:26,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:26,160 INFO L93 Difference]: Finished difference Result 464 states and 550 transitions. [2022-01-31 21:32:26,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:32:26,161 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:26,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:26,161 INFO L225 Difference]: With dead ends: 464 [2022-01-31 21:32:26,161 INFO L226 Difference]: Without dead ends: 305 [2022-01-31 21:32:26,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=148, Invalid=1112, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:26,162 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 1822 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:26,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 84 Invalid, 1832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1822 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:26,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-01-31 21:32:26,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 271. [2022-01-31 21:32:26,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:26,323 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:26,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:26,324 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:26,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:26,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:26,324 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:26,324 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:26,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2022-01-31 21:32:26,324 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:26,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:26,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1006233057, now seen corresponding path program 73 times [2022-01-31 21:32:26,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:26,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036138921] [2022-01-31 21:32:26,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:26,358 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:26,391 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:26,392 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:26,423 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:26,444 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:26,445 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:26,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:26,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:26,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:26,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:26,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:26,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:26,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:27,226 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:27,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036138921] [2022-01-31 21:32:27,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2036138921] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:27,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:27,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:32:27,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628129605] [2022-01-31 21:32:27,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:27,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:32:27,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:27,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:32:27,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1045, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:27,227 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:27,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:27,932 INFO L93 Difference]: Finished difference Result 461 states and 547 transitions. [2022-01-31 21:32:27,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:32:27,932 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:27,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:27,933 INFO L225 Difference]: With dead ends: 461 [2022-01-31 21:32:27,933 INFO L226 Difference]: Without dead ends: 302 [2022-01-31 21:32:27,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=155, Invalid=1177, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:27,933 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 67 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1540 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:27,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 64 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1540 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:27,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-01-31 21:32:28,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 271. [2022-01-31 21:32:28,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:28,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:28,092 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:28,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:28,092 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:28,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:28,092 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:28,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:28,092 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:28,092 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:28,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2022-01-31 21:32:28,093 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:28,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:28,093 INFO L85 PathProgramCache]: Analyzing trace with hash -944193443, now seen corresponding path program 74 times [2022-01-31 21:32:28,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:28,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439874730] [2022-01-31 21:32:28,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:28,126 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,168 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,169 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:28,200 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,230 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,230 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:28,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:28,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:28,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:28,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:28,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:28,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:28,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:29,187 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:29,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439874730] [2022-01-31 21:32:29,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [439874730] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:29,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:29,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:32:29,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118699203] [2022-01-31 21:32:29,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:29,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:32:29,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:29,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:32:29,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1108, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:29,189 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:29,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:29,966 INFO L93 Difference]: Finished difference Result 458 states and 544 transitions. [2022-01-31 21:32:29,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:32:29,966 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:29,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:29,967 INFO L225 Difference]: With dead ends: 458 [2022-01-31 21:32:29,967 INFO L226 Difference]: Without dead ends: 299 [2022-01-31 21:32:29,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=162, Invalid=1244, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:29,974 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 1673 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:29,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 79 Invalid, 1684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1673 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:29,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-01-31 21:32:30,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 271. [2022-01-31 21:32:30,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:30,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:30,137 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:30,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:30,137 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:30,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 32 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:30,137 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:30,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:30,137 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:30,137 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:30,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2022-01-31 21:32:30,138 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:30,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:30,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1545335519, now seen corresponding path program 75 times [2022-01-31 21:32:30,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:30,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553533953] [2022-01-31 21:32:30,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:30,167 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:30,201 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:30,202 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:30,230 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:30,264 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:30,264 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:30,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:30,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:30,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:30,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:30,393 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:30,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:30,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:31,100 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:31,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553533953] [2022-01-31 21:32:31,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [553533953] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:31,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:31,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:32:31,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511929427] [2022-01-31 21:32:31,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:31,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:32:31,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:31,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:32:31,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:31,102 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:31,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:31,849 INFO L93 Difference]: Finished difference Result 455 states and 541 transitions. [2022-01-31 21:32:31,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:32:31,849 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:31,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:31,850 INFO L225 Difference]: With dead ends: 455 [2022-01-31 21:32:31,850 INFO L226 Difference]: Without dead ends: 296 [2022-01-31 21:32:31,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:32:31,851 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2106 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 2116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:31,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 92 Invalid, 2116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2106 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:31,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2022-01-31 21:32:32,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 271. [2022-01-31 21:32:32,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:32,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:32,013 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:32,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:32,013 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:32,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:32,013 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:32,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:32,013 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:32,013 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:32,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2022-01-31 21:32:32,014 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:32,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:32,014 INFO L85 PathProgramCache]: Analyzing trace with hash 727687069, now seen corresponding path program 76 times [2022-01-31 21:32:32,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:32,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139085591] [2022-01-31 21:32:32,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:32,045 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:32,076 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:32,076 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:32,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:32,149 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:32,149 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:32,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:32,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:32,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:32,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:32,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:32,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:32,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:32,909 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:32,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139085591] [2022-01-31 21:32:32,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2139085591] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:32,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:32,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:32:32,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465004658] [2022-01-31 21:32:32,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:32,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:32:32,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:32,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:32:32,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1240, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:32,915 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:33,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:33,821 INFO L93 Difference]: Finished difference Result 452 states and 538 transitions. [2022-01-31 21:32:33,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:32:33,822 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:33,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:33,822 INFO L225 Difference]: With dead ends: 452 [2022-01-31 21:32:33,822 INFO L226 Difference]: Without dead ends: 293 [2022-01-31 21:32:33,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=176, Invalid=1384, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:32:33,823 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 2292 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 2303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:33,823 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 89 Invalid, 2303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2292 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:32:33,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-01-31 21:32:34,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 271. [2022-01-31 21:32:34,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:34,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:34,016 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:34,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:34,016 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:34,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 34 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:34,017 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:34,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:34,017 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:34,017 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:34,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2022-01-31 21:32:34,017 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:34,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:34,017 INFO L85 PathProgramCache]: Analyzing trace with hash -860660833, now seen corresponding path program 77 times [2022-01-31 21:32:34,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:34,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670834760] [2022-01-31 21:32:34,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:34,064 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:34,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:34,109 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:34,154 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:34,186 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:34,186 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:34,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:34,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:34,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:34,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:34,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:34,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:34,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:35,002 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:35,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670834760] [2022-01-31 21:32:35,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [670834760] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:35,002 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:35,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:32:35,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498308948] [2022-01-31 21:32:35,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:35,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:32:35,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:35,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:32:35,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:32:35,003 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:35,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:35,657 INFO L93 Difference]: Finished difference Result 450 states and 536 transitions. [2022-01-31 21:32:35,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:32:35,658 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:35,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:35,658 INFO L225 Difference]: With dead ends: 450 [2022-01-31 21:32:35,658 INFO L226 Difference]: Without dead ends: 291 [2022-01-31 21:32:35,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=183, Invalid=1457, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:32:35,659 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 2052 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 2062 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:35,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 82 Invalid, 2062 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2052 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:35,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2022-01-31 21:32:35,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 271. [2022-01-31 21:32:35,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 256 states have (on average 1.1875) internal successors, (304), 259 states have internal predecessors, (304), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:35,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 321 transitions. [2022-01-31 21:32:35,825 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 321 transitions. Word has length 61 [2022-01-31 21:32:35,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:35,825 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 321 transitions. [2022-01-31 21:32:35,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.4864864864864864) internal successors, (55), 35 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:35,826 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 321 transitions. [2022-01-31 21:32:35,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:32:35,826 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:35,826 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:35,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2022-01-31 21:32:35,826 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:35,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:35,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1871778083, now seen corresponding path program 78 times [2022-01-31 21:32:35,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:35,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770698819] [2022-01-31 21:32:35,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:35,889 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:35,889 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:32:35,926 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:35,961 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:35,961 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:35,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:35,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:36,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:36,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:36,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:36,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:36,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:37,045 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:37,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770698819] [2022-01-31 21:32:37,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1770698819] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:37,046 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:37,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:32:37,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708589006] [2022-01-31 21:32:37,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:37,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:32:37,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:37,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:32:37,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:32:37,046 INFO L87 Difference]: Start difference. First operand 271 states and 321 transitions. Second operand has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:37,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:37,754 INFO L93 Difference]: Finished difference Result 461 states and 551 transitions. [2022-01-31 21:32:37,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:32:37,755 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-01-31 21:32:37,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:37,755 INFO L225 Difference]: With dead ends: 461 [2022-01-31 21:32:37,755 INFO L226 Difference]: Without dead ends: 291 [2022-01-31 21:32:37,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=190, Invalid=1532, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:32:37,756 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 1615 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:37,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 59 Invalid, 1625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1615 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:37,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2022-01-31 21:32:37,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 274. [2022-01-31 21:32:37,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 259 states have (on average 1.1891891891891893) internal successors, (308), 262 states have internal predecessors, (308), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:37,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 325 transitions. [2022-01-31 21:32:37,915 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 325 transitions. Word has length 61 [2022-01-31 21:32:37,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:37,915 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 325 transitions. [2022-01-31 21:32:37,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 36 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:37,915 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 325 transitions. [2022-01-31 21:32:37,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-01-31 21:32:37,915 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:37,915 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:37,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2022-01-31 21:32:37,916 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:37,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:37,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1779769613, now seen corresponding path program 5 times [2022-01-31 21:32:37,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:37,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209516682] [2022-01-31 21:32:37,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:37,983 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,021 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,022 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:38,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:38,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:38,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,069 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:38,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:38,161 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:38,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209516682] [2022-01-31 21:32:38,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1209516682] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:38,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:38,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:32:38,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016943864] [2022-01-31 21:32:38,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:38,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:32:38,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:38,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:32:38,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:32:38,162 INFO L87 Difference]: Start difference. First operand 274 states and 325 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:32:38,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:38,468 INFO L93 Difference]: Finished difference Result 500 states and 600 transitions. [2022-01-31 21:32:38,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:32:38,469 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 63 [2022-01-31 21:32:38,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:38,469 INFO L225 Difference]: With dead ends: 500 [2022-01-31 21:32:38,469 INFO L226 Difference]: Without dead ends: 332 [2022-01-31 21:32:38,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=351, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:32:38,470 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 78 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:38,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 33 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:32:38,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-01-31 21:32:38,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 301. [2022-01-31 21:32:38,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 286 states have (on average 1.1818181818181819) internal successors, (338), 289 states have internal predecessors, (338), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:38,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 355 transitions. [2022-01-31 21:32:38,638 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 355 transitions. Word has length 63 [2022-01-31 21:32:38,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:38,639 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 355 transitions. [2022-01-31 21:32:38,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:32:38,639 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 355 transitions. [2022-01-31 21:32:38,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:38,639 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:38,639 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:38,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2022-01-31 21:32:38,639 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:38,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:38,640 INFO L85 PathProgramCache]: Analyzing trace with hash -2046600004, now seen corresponding path program 79 times [2022-01-31 21:32:38,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:38,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89940263] [2022-01-31 21:32:38,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:38,670 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,719 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,719 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:38,762 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,804 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:38,805 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:38,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:38,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:38,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:38,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:38,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:39,684 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:39,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89940263] [2022-01-31 21:32:39,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [89940263] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:39,685 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:39,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:32:39,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944641935] [2022-01-31 21:32:39,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:39,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:32:39,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:39,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:32:39,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:32:39,685 INFO L87 Difference]: Start difference. First operand 301 states and 355 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:40,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:40,489 INFO L93 Difference]: Finished difference Result 539 states and 632 transitions. [2022-01-31 21:32:40,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:32:40,490 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:40,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:40,491 INFO L225 Difference]: With dead ends: 539 [2022-01-31 21:32:40,491 INFO L226 Difference]: Without dead ends: 353 [2022-01-31 21:32:40,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:40,491 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1382 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:40,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 64 Invalid, 1392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1382 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:40,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-01-31 21:32:40,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 304. [2022-01-31 21:32:40,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:40,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:40,678 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:40,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:40,678 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:40,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:40,678 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:40,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:40,678 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:40,678 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:40,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2022-01-31 21:32:40,679 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:40,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:40,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1895278910, now seen corresponding path program 80 times [2022-01-31 21:32:40,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:40,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583112960] [2022-01-31 21:32:40,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:40,726 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:40,772 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:40,772 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:40,818 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:40,861 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:40,861 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:40,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:40,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:40,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:40,976 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:40,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:41,846 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:41,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583112960] [2022-01-31 21:32:41,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1583112960] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:41,846 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:41,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:32:41,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389811983] [2022-01-31 21:32:41,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:41,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:32:41,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:41,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:32:41,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:32:41,847 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:42,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:42,823 INFO L93 Difference]: Finished difference Result 542 states and 635 transitions. [2022-01-31 21:32:42,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:32:42,823 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:42,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:42,824 INFO L225 Difference]: With dead ends: 542 [2022-01-31 21:32:42,824 INFO L226 Difference]: Without dead ends: 356 [2022-01-31 21:32:42,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=932, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:42,825 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 1882 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1882 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:42,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 76 Invalid, 1893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1882 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:42,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-01-31 21:32:43,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 304. [2022-01-31 21:32:43,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:43,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:43,018 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:43,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:43,018 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:43,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:43,018 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:43,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:43,019 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:43,019 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:43,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2022-01-31 21:32:43,019 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:43,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:43,019 INFO L85 PathProgramCache]: Analyzing trace with hash -154108932, now seen corresponding path program 81 times [2022-01-31 21:32:43,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:43,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [734184732] [2022-01-31 21:32:43,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:43,060 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:43,096 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:43,096 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:43,124 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:43,151 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:43,152 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:43,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:43,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:43,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:43,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:43,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:43,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:43,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:44,151 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:44,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [734184732] [2022-01-31 21:32:44,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [734184732] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:44,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:44,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:32:44,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656318861] [2022-01-31 21:32:44,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:44,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:32:44,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:44,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:32:44,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:32:44,153 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:45,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:45,010 INFO L93 Difference]: Finished difference Result 539 states and 632 transitions. [2022-01-31 21:32:45,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:32:45,010 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:45,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:45,011 INFO L225 Difference]: With dead ends: 539 [2022-01-31 21:32:45,011 INFO L226 Difference]: Without dead ends: 353 [2022-01-31 21:32:45,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=131, Invalid=991, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:45,011 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1462 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 1472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:45,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 62 Invalid, 1472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1462 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:45,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-01-31 21:32:45,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 304. [2022-01-31 21:32:45,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:45,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:45,228 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:45,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:45,229 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:45,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:45,229 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:45,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:45,229 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:45,229 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:45,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2022-01-31 21:32:45,229 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:45,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:45,229 INFO L85 PathProgramCache]: Analyzing trace with hash 269537790, now seen corresponding path program 82 times [2022-01-31 21:32:45,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:45,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448759135] [2022-01-31 21:32:45,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:45,276 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,321 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,322 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:45,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,397 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:45,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:45,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:45,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:45,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:45,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:45,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:45,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:46,106 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:46,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448759135] [2022-01-31 21:32:46,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1448759135] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:46,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:46,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:32:46,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169564327] [2022-01-31 21:32:46,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:46,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:32:46,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:46,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:32:46,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:32:46,107 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:46,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:46,919 INFO L93 Difference]: Finished difference Result 536 states and 629 transitions. [2022-01-31 21:32:46,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:32:46,920 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:46,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:46,920 INFO L225 Difference]: With dead ends: 536 [2022-01-31 21:32:46,921 INFO L226 Difference]: Without dead ends: 350 [2022-01-31 21:32:46,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:46,921 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 1936 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 1947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:46,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 86 Invalid, 1947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1936 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:46,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2022-01-31 21:32:47,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 304. [2022-01-31 21:32:47,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:47,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:47,133 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:47,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:47,134 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:47,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:47,134 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:47,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:47,134 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:47,134 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:47,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2022-01-31 21:32:47,134 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:47,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:47,134 INFO L85 PathProgramCache]: Analyzing trace with hash -759821508, now seen corresponding path program 83 times [2022-01-31 21:32:47,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:47,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [484457467] [2022-01-31 21:32:47,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:47,157 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:47,184 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:47,184 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:47,229 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:47,257 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:47,257 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:47,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:47,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:47,354 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:47,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:47,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:47,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:47,358 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:48,095 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:48,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [484457467] [2022-01-31 21:32:48,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [484457467] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:48,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:48,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:32:48,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446067757] [2022-01-31 21:32:48,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:48,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:32:48,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:48,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:32:48,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:32:48,096 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:49,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:49,038 INFO L93 Difference]: Finished difference Result 533 states and 626 transitions. [2022-01-31 21:32:49,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:32:49,038 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:49,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:49,041 INFO L225 Difference]: With dead ends: 533 [2022-01-31 21:32:49,041 INFO L226 Difference]: Without dead ends: 347 [2022-01-31 21:32:49,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:49,041 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 1890 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:49,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 73 Invalid, 1901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1890 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:49,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2022-01-31 21:32:49,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 304. [2022-01-31 21:32:49,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:49,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:49,253 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:49,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:49,253 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:49,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:49,253 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:49,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:49,253 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:49,253 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:49,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2022-01-31 21:32:49,253 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:49,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:49,254 INFO L85 PathProgramCache]: Analyzing trace with hash -1603827010, now seen corresponding path program 84 times [2022-01-31 21:32:49,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:49,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715302740] [2022-01-31 21:32:49,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:49,287 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:49,331 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:49,331 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:49,384 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:49,426 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:49,426 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:49,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:49,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:49,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:49,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:49,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:49,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:49,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:50,268 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:50,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715302740] [2022-01-31 21:32:50,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [715302740] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:50,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:50,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:32:50,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017736247] [2022-01-31 21:32:50,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:50,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:32:50,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:50,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:32:50,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:32:50,270 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:51,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:51,064 INFO L93 Difference]: Finished difference Result 530 states and 623 transitions. [2022-01-31 21:32:51,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:32:51,065 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:51,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:51,065 INFO L225 Difference]: With dead ends: 530 [2022-01-31 21:32:51,065 INFO L226 Difference]: Without dead ends: 344 [2022-01-31 21:32:51,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=152, Invalid=1180, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:51,066 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 66 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 1818 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:51,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 65 Invalid, 1829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1818 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:32:51,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2022-01-31 21:32:51,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 304. [2022-01-31 21:32:51,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:51,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:51,285 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:51,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:51,285 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:51,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:51,285 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:51,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:51,285 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:51,285 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:51,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2022-01-31 21:32:51,285 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:51,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:51,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1329067396, now seen corresponding path program 85 times [2022-01-31 21:32:51,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:51,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755828737] [2022-01-31 21:32:51,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:51,322 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:51,363 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:51,364 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:51,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:51,439 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:51,439 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:51,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:51,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:51,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:51,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:51,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:51,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:51,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:52,502 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:52,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755828737] [2022-01-31 21:32:52,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [755828737] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:52,502 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:52,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:32:52,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972134632] [2022-01-31 21:32:52,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:52,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:32:52,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:52,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:32:52,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:32:52,503 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:53,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:53,387 INFO L93 Difference]: Finished difference Result 527 states and 620 transitions. [2022-01-31 21:32:53,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:32:53,387 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:53,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:53,388 INFO L225 Difference]: With dead ends: 527 [2022-01-31 21:32:53,388 INFO L226 Difference]: Without dead ends: 341 [2022-01-31 21:32:53,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:53,389 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 1836 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:53,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 76 Invalid, 1846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1836 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:53,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-01-31 21:32:53,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 304. [2022-01-31 21:32:53,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:53,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:53,607 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:53,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:53,607 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:53,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:53,608 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:53,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:53,608 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:53,608 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:53,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2022-01-31 21:32:53,608 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:53,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:53,608 INFO L85 PathProgramCache]: Analyzing trace with hash 57135998, now seen corresponding path program 86 times [2022-01-31 21:32:53,608 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:53,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584175019] [2022-01-31 21:32:53,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:53,649 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,690 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,690 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:53,725 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,767 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:53,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:53,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:53,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:53,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:53,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:53,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:54,807 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:54,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584175019] [2022-01-31 21:32:54,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1584175019] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:54,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:54,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:32:54,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178578851] [2022-01-31 21:32:54,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:54,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:32:54,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:54,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:32:54,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1176, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:32:54,809 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:55,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:55,809 INFO L93 Difference]: Finished difference Result 524 states and 617 transitions. [2022-01-31 21:32:55,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:32:55,809 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:55,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:55,810 INFO L225 Difference]: With dead ends: 524 [2022-01-31 21:32:55,810 INFO L226 Difference]: Without dead ends: 338 [2022-01-31 21:32:55,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=166, Invalid=1316, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:32:55,811 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 2116 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 2126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:55,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 88 Invalid, 2126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2116 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:32:55,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2022-01-31 21:32:56,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 304. [2022-01-31 21:32:56,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:56,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:56,036 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:56,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:56,036 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:56,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:56,037 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:56,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:56,037 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:56,037 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:56,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2022-01-31 21:32:56,037 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:56,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:56,037 INFO L85 PathProgramCache]: Analyzing trace with hash 119175612, now seen corresponding path program 87 times [2022-01-31 21:32:56,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:56,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606971560] [2022-01-31 21:32:56,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:56,086 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:56,131 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:56,131 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:56,178 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:56,222 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:56,222 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:56,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:56,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:56,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:56,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:56,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:56,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:56,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:57,272 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:57,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606971560] [2022-01-31 21:32:57,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1606971560] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:57,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:57,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:32:57,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046795772] [2022-01-31 21:32:57,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:57,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:32:57,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:57,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:32:57,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1243, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:32:57,274 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:58,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:58,088 INFO L93 Difference]: Finished difference Result 521 states and 614 transitions. [2022-01-31 21:32:58,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:32:58,089 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:32:58,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:58,090 INFO L225 Difference]: With dead ends: 521 [2022-01-31 21:32:58,090 INFO L226 Difference]: Without dead ends: 335 [2022-01-31 21:32:58,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=173, Invalid=1387, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:32:58,090 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 72 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 2086 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 2097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:58,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 76 Invalid, 2097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2086 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:32:58,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-01-31 21:32:58,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 304. [2022-01-31 21:32:58,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:32:58,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:32:58,308 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:32:58,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:58,308 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:32:58,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 34 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:32:58,308 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:32:58,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:32:58,308 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:58,308 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:58,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2022-01-31 21:32:58,308 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:58,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:58,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1686262722, now seen corresponding path program 88 times [2022-01-31 21:32:58,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:58,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339447557] [2022-01-31 21:32:58,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:58,331 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:58,358 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:58,358 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:58,379 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:58,406 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:58,406 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:58,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:58,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:58,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:58,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:58,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:32:58,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:58,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:59,469 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:59,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339447557] [2022-01-31 21:32:59,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [339447557] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:59,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:59,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:32:59,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817010081] [2022-01-31 21:32:59,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:59,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:32:59,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:59,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:32:59,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:32:59,470 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:00,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:00,456 INFO L93 Difference]: Finished difference Result 518 states and 611 transitions. [2022-01-31 21:33:00,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:33:00,457 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:33:00,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:00,457 INFO L225 Difference]: With dead ends: 518 [2022-01-31 21:33:00,457 INFO L226 Difference]: Without dead ends: 332 [2022-01-31 21:33:00,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=180, Invalid=1460, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:33:00,458 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 2174 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 2184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:00,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 88 Invalid, 2184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2174 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:00,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-01-31 21:33:00,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 304. [2022-01-31 21:33:00,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:00,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:33:00,682 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:33:00,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:00,682 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:33:00,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.5675675675675675) internal successors, (58), 35 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:00,682 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:33:00,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:33:00,683 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:00,683 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:00,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2022-01-31 21:33:00,683 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:00,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:00,683 INFO L85 PathProgramCache]: Analyzing trace with hash 1791056124, now seen corresponding path program 89 times [2022-01-31 21:33:00,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:00,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195273414] [2022-01-31 21:33:00,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:00,729 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:00,764 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:00,764 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:00,809 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:00,851 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:00,852 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:00,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:00,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:00,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:00,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:00,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:00,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:00,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:01,938 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:01,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195273414] [2022-01-31 21:33:01,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1195273414] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:01,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:01,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:33:01,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950957688] [2022-01-31 21:33:01,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:01,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:33:01,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:01,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:33:01,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:33:01,939 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:02,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:02,900 INFO L93 Difference]: Finished difference Result 515 states and 608 transitions. [2022-01-31 21:33:02,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:33:02,900 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:33:02,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:02,901 INFO L225 Difference]: With dead ends: 515 [2022-01-31 21:33:02,901 INFO L226 Difference]: Without dead ends: 329 [2022-01-31 21:33:02,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=187, Invalid=1535, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:33:02,902 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 77 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2197 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:02,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 66 Invalid, 2208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2197 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:02,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-01-31 21:33:03,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 304. [2022-01-31 21:33:03,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:03,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:33:03,120 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:33:03,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:03,120 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:33:03,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:03,120 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:33:03,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:33:03,120 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:03,120 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:03,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102 [2022-01-31 21:33:03,121 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:03,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:03,121 INFO L85 PathProgramCache]: Analyzing trace with hash 202708222, now seen corresponding path program 90 times [2022-01-31 21:33:03,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:03,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524809259] [2022-01-31 21:33:03,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:03,159 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:03,203 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:03,204 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:03,248 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:03,280 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:03,280 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:03,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:03,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:03,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:03,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:03,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:03,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:03,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:04,371 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:04,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524809259] [2022-01-31 21:33:04,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1524809259] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:04,371 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:04,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:33:04,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703760209] [2022-01-31 21:33:04,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:04,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:33:04,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:04,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:33:04,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1456, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:33:04,372 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:05,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:05,224 INFO L93 Difference]: Finished difference Result 513 states and 606 transitions. [2022-01-31 21:33:05,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:33:05,224 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:33:05,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:05,225 INFO L225 Difference]: With dead ends: 513 [2022-01-31 21:33:05,225 INFO L226 Difference]: Without dead ends: 327 [2022-01-31 21:33:05,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=194, Invalid=1612, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:33:05,226 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1866 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:05,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 56 Invalid, 1876 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1866 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:05,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2022-01-31 21:33:05,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 304. [2022-01-31 21:33:05,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 289 states have (on average 1.179930795847751) internal successors, (341), 292 states have internal predecessors, (341), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:05,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 358 transitions. [2022-01-31 21:33:05,443 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 358 transitions. Word has length 64 [2022-01-31 21:33:05,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:05,443 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 358 transitions. [2022-01-31 21:33:05,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4871794871794872) internal successors, (58), 37 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:05,443 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 358 transitions. [2022-01-31 21:33:05,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:33:05,444 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:05,444 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:05,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2022-01-31 21:33:05,444 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:05,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:05,444 INFO L85 PathProgramCache]: Analyzing trace with hash -808409028, now seen corresponding path program 91 times [2022-01-31 21:33:05,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:05,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367525603] [2022-01-31 21:33:05,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:05,486 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:05,487 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:33:05,523 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:05,566 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:05,567 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:05,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:05,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:05,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:05,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:05,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:05,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:05,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:06,720 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:06,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367525603] [2022-01-31 21:33:06,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1367525603] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:06,721 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:06,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:33:06,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223606166] [2022-01-31 21:33:06,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:06,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:33:06,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:06,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:33:06,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1531, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:33:06,721 INFO L87 Difference]: Start difference. First operand 304 states and 358 transitions. Second operand has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:07,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:07,567 INFO L93 Difference]: Finished difference Result 524 states and 621 transitions. [2022-01-31 21:33:07,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:33:07,567 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-01-31 21:33:07,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:07,567 INFO L225 Difference]: With dead ends: 524 [2022-01-31 21:33:07,568 INFO L226 Difference]: Without dead ends: 327 [2022-01-31 21:33:07,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 6 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=201, Invalid=1691, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:33:07,568 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 74 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 2203 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 2215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:07,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 73 Invalid, 2215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2203 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:07,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2022-01-31 21:33:07,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 307. [2022-01-31 21:33:07,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 292 states have (on average 1.1815068493150684) internal successors, (345), 295 states have internal predecessors, (345), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:07,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 362 transitions. [2022-01-31 21:33:07,790 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 362 transitions. Word has length 64 [2022-01-31 21:33:07,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:07,790 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 362 transitions. [2022-01-31 21:33:07,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 38 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:07,791 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 362 transitions. [2022-01-31 21:33:07,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:07,791 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:07,791 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:07,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2022-01-31 21:33:07,791 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:07,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:07,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1878189759, now seen corresponding path program 92 times [2022-01-31 21:33:07,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:07,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420607861] [2022-01-31 21:33:07,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:07,823 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:07,851 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:07,851 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:07,872 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:07,898 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:07,899 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:07,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:07,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:08,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:08,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:08,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:08,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:08,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:08,753 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:08,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420607861] [2022-01-31 21:33:08,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [420607861] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:08,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:08,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:33:08,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021080675] [2022-01-31 21:33:08,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:08,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:33:08,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:08,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:33:08,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:33:08,754 INFO L87 Difference]: Start difference. First operand 307 states and 362 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:09,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:09,570 INFO L93 Difference]: Finished difference Result 548 states and 642 transitions. [2022-01-31 21:33:09,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:33:09,570 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:09,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:09,571 INFO L225 Difference]: With dead ends: 548 [2022-01-31 21:33:09,571 INFO L226 Difference]: Without dead ends: 362 [2022-01-31 21:33:09,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:33:09,572 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 44 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1596 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 1606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:09,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 72 Invalid, 1606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1596 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:33:09,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2022-01-31 21:33:09,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 310. [2022-01-31 21:33:09,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:09,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:09,815 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:09,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:09,815 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:09,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:09,815 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:09,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:09,815 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:09,815 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:09,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105 [2022-01-31 21:33:09,816 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:09,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:09,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1397109501, now seen corresponding path program 93 times [2022-01-31 21:33:09,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:09,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311604284] [2022-01-31 21:33:09,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:09,842 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:09,863 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:09,863 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:09,884 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:09,904 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:09,904 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:09,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:09,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:09,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:09,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:09,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:09,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:10,606 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:10,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311604284] [2022-01-31 21:33:10,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [311604284] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:10,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:10,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:33:10,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559245999] [2022-01-31 21:33:10,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:10,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:33:10,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:10,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:33:10,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=874, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:33:10,608 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:11,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:11,464 INFO L93 Difference]: Finished difference Result 551 states and 645 transitions. [2022-01-31 21:33:11,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:33:11,464 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:11,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:11,465 INFO L225 Difference]: With dead ends: 551 [2022-01-31 21:33:11,465 INFO L226 Difference]: Without dead ends: 365 [2022-01-31 21:33:11,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:33:11,466 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 1629 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:11,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 68 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1629 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:33:11,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2022-01-31 21:33:11,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 310. [2022-01-31 21:33:11,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:11,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:11,740 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:11,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:11,740 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:11,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:11,740 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:11,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:11,740 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:11,740 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:11,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2022-01-31 21:33:11,741 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:11,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:11,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1044021119, now seen corresponding path program 94 times [2022-01-31 21:33:11,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:11,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330999187] [2022-01-31 21:33:11,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:11,795 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,837 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,837 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:11,881 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,922 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,922 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:11,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:11,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:12,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:12,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:12,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:12,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:12,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:12,967 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:12,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330999187] [2022-01-31 21:33:12,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1330999187] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:12,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:12,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:33:12,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689557072] [2022-01-31 21:33:12,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:12,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:33:12,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:12,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:33:12,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:33:12,969 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:14,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:14,018 INFO L93 Difference]: Finished difference Result 548 states and 642 transitions. [2022-01-31 21:33:14,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:33:14,018 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:14,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:14,019 INFO L225 Difference]: With dead ends: 548 [2022-01-31 21:33:14,019 INFO L226 Difference]: Without dead ends: 362 [2022-01-31 21:33:14,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:33:14,020 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 1886 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:14,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 77 Invalid, 1897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1886 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:14,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2022-01-31 21:33:14,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 310. [2022-01-31 21:33:14,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:14,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:14,279 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:14,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:14,280 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:14,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:14,280 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:14,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:14,280 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:14,280 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:14,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2022-01-31 21:33:14,280 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:14,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:14,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1005366723, now seen corresponding path program 95 times [2022-01-31 21:33:14,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:14,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011499924] [2022-01-31 21:33:14,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:14,310 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:14,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:14,346 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:14,403 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:14,442 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:14,442 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:14,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:14,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:14,556 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:14,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:14,559 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:14,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:14,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:15,276 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:15,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011499924] [2022-01-31 21:33:15,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1011499924] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:15,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:15,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:33:15,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981392268] [2022-01-31 21:33:15,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:15,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:33:15,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:15,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:33:15,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=990, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:33:15,277 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:16,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:16,130 INFO L93 Difference]: Finished difference Result 545 states and 639 transitions. [2022-01-31 21:33:16,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:33:16,131 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:16,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:16,131 INFO L225 Difference]: With dead ends: 545 [2022-01-31 21:33:16,131 INFO L226 Difference]: Without dead ends: 359 [2022-01-31 21:33:16,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=142, Invalid=1118, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:33:16,132 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1590 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:16,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 60 Invalid, 1600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1590 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:33:16,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2022-01-31 21:33:16,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 310. [2022-01-31 21:33:16,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:16,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:16,398 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:16,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:16,398 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:16,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:16,399 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:16,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:16,399 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:16,399 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:16,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108 [2022-01-31 21:33:16,399 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:16,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:16,399 INFO L85 PathProgramCache]: Analyzing trace with hash -581720001, now seen corresponding path program 96 times [2022-01-31 21:33:16,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:16,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572612990] [2022-01-31 21:33:16,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:16,437 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:16,464 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:16,464 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:16,513 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:16,543 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:16,543 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:16,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:16,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:16,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:16,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:16,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:16,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:16,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:17,532 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:17,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572612990] [2022-01-31 21:33:17,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1572612990] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:17,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:17,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:33:17,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573187818] [2022-01-31 21:33:17,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:17,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:33:17,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:17,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:33:17,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1051, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:33:17,533 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:18,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:18,450 INFO L93 Difference]: Finished difference Result 542 states and 636 transitions. [2022-01-31 21:33:18,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:33:18,451 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:18,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:18,451 INFO L225 Difference]: With dead ends: 542 [2022-01-31 21:33:18,451 INFO L226 Difference]: Without dead ends: 356 [2022-01-31 21:33:18,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=149, Invalid=1183, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:33:18,452 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 1706 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:18,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 58 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1706 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:33:18,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-01-31 21:33:18,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 310. [2022-01-31 21:33:18,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:18,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:18,717 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:18,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:18,718 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:18,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:18,718 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:18,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:18,718 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:18,718 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:18,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2022-01-31 21:33:18,718 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:18,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:18,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1611079299, now seen corresponding path program 97 times [2022-01-31 21:33:18,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:18,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970906799] [2022-01-31 21:33:18,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:18,749 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:18,774 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:18,775 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:18,804 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:18,831 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:18,831 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:18,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:18,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:18,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:18,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:18,902 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:18,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:18,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:19,528 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:19,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970906799] [2022-01-31 21:33:19,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [970906799] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:19,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:19,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:33:19,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45959559] [2022-01-31 21:33:19,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:19,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:33:19,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:19,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:33:19,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:33:19,529 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:20,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:20,479 INFO L93 Difference]: Finished difference Result 539 states and 633 transitions. [2022-01-31 21:33:20,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:33:20,479 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:20,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:20,480 INFO L225 Difference]: With dead ends: 539 [2022-01-31 21:33:20,480 INFO L226 Difference]: Without dead ends: 353 [2022-01-31 21:33:20,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:33:20,481 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2140 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 2151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:20,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 75 Invalid, 2151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2140 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:33:20,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-01-31 21:33:20,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 310. [2022-01-31 21:33:20,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:20,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:20,756 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:20,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:20,756 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:20,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:20,757 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:20,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:20,757 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:20,757 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:20,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2022-01-31 21:33:20,757 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:20,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:20,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1839882495, now seen corresponding path program 98 times [2022-01-31 21:33:20,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:20,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512920702] [2022-01-31 21:33:20,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:20,780 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:20,830 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:20,830 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:20,869 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:20,928 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:20,929 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:20,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:20,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:21,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:21,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:21,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:21,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:21,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:22,026 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:22,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512920702] [2022-01-31 21:33:22,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1512920702] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:22,027 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:22,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:33:22,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811222152] [2022-01-31 21:33:22,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:22,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:33:22,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:22,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:33:22,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1179, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:33:22,028 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:23,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:23,087 INFO L93 Difference]: Finished difference Result 536 states and 630 transitions. [2022-01-31 21:33:23,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:33:23,087 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:23,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:23,088 INFO L225 Difference]: With dead ends: 536 [2022-01-31 21:33:23,088 INFO L226 Difference]: Without dead ends: 350 [2022-01-31 21:33:23,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:33:23,088 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1904 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:23,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 60 Invalid, 1914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1904 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:23,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2022-01-31 21:33:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 310. [2022-01-31 21:33:23,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:23,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:23,380 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:23,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:23,380 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:23,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:23,380 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:23,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:23,381 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:23,381 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:23,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2022-01-31 21:33:23,381 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:23,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:23,381 INFO L85 PathProgramCache]: Analyzing trace with hash 2114642109, now seen corresponding path program 99 times [2022-01-31 21:33:23,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:23,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1457996867] [2022-01-31 21:33:23,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:23,433 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:23,479 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:23,480 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:23,524 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:23,566 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:23,566 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:23,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:23,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:23,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:23,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:23,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:23,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:24,443 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:24,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1457996867] [2022-01-31 21:33:24,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1457996867] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:24,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:24,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:33:24,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072243232] [2022-01-31 21:33:24,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:24,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:33:24,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:24,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:33:24,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:33:24,444 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:25,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:25,399 INFO L93 Difference]: Finished difference Result 533 states and 627 transitions. [2022-01-31 21:33:25,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:33:25,400 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:25,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:25,400 INFO L225 Difference]: With dead ends: 533 [2022-01-31 21:33:25,400 INFO L226 Difference]: Without dead ends: 347 [2022-01-31 21:33:25,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:33:25,401 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 2290 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 2301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:25,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 94 Invalid, 2301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2290 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:25,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2022-01-31 21:33:25,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 310. [2022-01-31 21:33:25,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:25,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:25,694 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:25,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:25,694 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:25,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:25,694 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:25,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:25,694 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:25,694 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:25,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2022-01-31 21:33:25,695 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:25,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:25,695 INFO L85 PathProgramCache]: Analyzing trace with hash -794121793, now seen corresponding path program 100 times [2022-01-31 21:33:25,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:25,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657592428] [2022-01-31 21:33:25,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:25,723 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:25,769 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:25,769 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:25,803 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:25,834 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:25,834 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:25,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:25,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:25,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:25,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:25,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:25,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:26,719 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:26,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657592428] [2022-01-31 21:33:26,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [657592428] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:26,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:26,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:33:26,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773069950] [2022-01-31 21:33:26,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:26,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:33:26,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:26,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:33:26,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1315, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:33:26,720 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:27,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:27,792 INFO L93 Difference]: Finished difference Result 530 states and 624 transitions. [2022-01-31 21:33:27,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:33:27,792 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:27,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:27,793 INFO L225 Difference]: With dead ends: 530 [2022-01-31 21:33:27,793 INFO L226 Difference]: Without dead ends: 344 [2022-01-31 21:33:27,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=177, Invalid=1463, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:33:27,793 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 67 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 2631 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 2642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:27,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 83 Invalid, 2642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2631 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:27,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2022-01-31 21:33:28,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 310. [2022-01-31 21:33:28,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:28,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:28,072 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:28,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:28,073 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:28,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:28,073 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:28,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:28,073 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:28,073 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:28,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2022-01-31 21:33:28,073 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:28,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:28,074 INFO L85 PathProgramCache]: Analyzing trace with hash -732082179, now seen corresponding path program 101 times [2022-01-31 21:33:28,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:28,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428977805] [2022-01-31 21:33:28,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:28,103 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:28,139 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:28,139 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:28,173 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:28,207 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:28,207 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:28,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:28,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:28,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:28,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:28,331 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:28,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:29,270 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:29,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428977805] [2022-01-31 21:33:29,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [428977805] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:29,270 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:29,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:33:29,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483647685] [2022-01-31 21:33:29,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:29,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:33:29,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:29,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:33:29,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:33:29,271 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:30,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:30,299 INFO L93 Difference]: Finished difference Result 527 states and 621 transitions. [2022-01-31 21:33:30,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:33:30,299 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:30,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:30,300 INFO L225 Difference]: With dead ends: 527 [2022-01-31 21:33:30,300 INFO L226 Difference]: Without dead ends: 341 [2022-01-31 21:33:30,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:33:30,300 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 66 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 2350 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 2361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:30,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 79 Invalid, 2361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2350 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:30,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-01-31 21:33:30,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 310. [2022-01-31 21:33:30,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:30,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:30,578 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:30,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:30,579 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:30,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.605263157894737) internal successors, (61), 36 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:30,579 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:30,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:30,579 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:30,579 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:30,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2022-01-31 21:33:30,579 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:30,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:30,580 INFO L85 PathProgramCache]: Analyzing trace with hash 1757446783, now seen corresponding path program 102 times [2022-01-31 21:33:30,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:30,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557565421] [2022-01-31 21:33:30,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:30,613 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:30,636 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:30,636 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:30,669 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:30,700 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:30,700 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:30,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:30,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:30,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:30,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:30,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:30,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:30,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:31,885 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:31,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557565421] [2022-01-31 21:33:31,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1557565421] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:31,889 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:31,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:33:31,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253951585] [2022-01-31 21:33:31,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:31,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:33:31,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:31,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:33:31,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1459, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:33:31,890 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:32,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:32,838 INFO L93 Difference]: Finished difference Result 524 states and 618 transitions. [2022-01-31 21:33:32,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:33:32,838 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:32,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:32,839 INFO L225 Difference]: With dead ends: 524 [2022-01-31 21:33:32,839 INFO L226 Difference]: Without dead ends: 338 [2022-01-31 21:33:32,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=191, Invalid=1615, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:33:32,839 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 2196 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 2207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:32,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 2207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2196 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:32,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2022-01-31 21:33:33,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 310. [2022-01-31 21:33:33,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:33,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:33,117 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:33,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:33,117 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:33,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.564102564102564) internal successors, (61), 37 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:33,117 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:33,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:33,117 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:33,117 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:33,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2022-01-31 21:33:33,118 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:33,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:33,118 INFO L85 PathProgramCache]: Analyzing trace with hash 939798333, now seen corresponding path program 103 times [2022-01-31 21:33:33,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:33,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286513477] [2022-01-31 21:33:33,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:33,179 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:33,220 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:33,220 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:33,265 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:33,307 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:33,307 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:33,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:33,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:33,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:33,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:33,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:33,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:33,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:34,156 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:34,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286513477] [2022-01-31 21:33:34,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1286513477] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:34,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:34,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:33:34,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256808660] [2022-01-31 21:33:34,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:34,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:33:34,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:34,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:33:34,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1534, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:33:34,157 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:35,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:35,007 INFO L93 Difference]: Finished difference Result 521 states and 615 transitions. [2022-01-31 21:33:35,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:33:35,008 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:35,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:35,008 INFO L225 Difference]: With dead ends: 521 [2022-01-31 21:33:35,008 INFO L226 Difference]: Without dead ends: 335 [2022-01-31 21:33:35,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=198, Invalid=1694, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:33:35,009 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2243 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:35,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 70 Invalid, 2254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2243 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:35,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-01-31 21:33:35,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 310. [2022-01-31 21:33:35,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:35,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:35,286 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:35,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:35,286 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:35,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.525) internal successors, (61), 38 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:35,287 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:35,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:35,287 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:35,287 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:35,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2022-01-31 21:33:35,287 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:35,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:35,287 INFO L85 PathProgramCache]: Analyzing trace with hash -648549569, now seen corresponding path program 104 times [2022-01-31 21:33:35,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:35,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762755099] [2022-01-31 21:33:35,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:35,316 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:35,350 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:35,350 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:35,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:35,416 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:35,416 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:35,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:35,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:35,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:35,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:35,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:35,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:35,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:36,483 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:36,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762755099] [2022-01-31 21:33:36,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [762755099] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:36,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:36,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:33:36,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361891803] [2022-01-31 21:33:36,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:36,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:33:36,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:36,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:33:36,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1611, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:33:36,485 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:37,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:37,407 INFO L93 Difference]: Finished difference Result 519 states and 613 transitions. [2022-01-31 21:33:37,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:33:37,408 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:37,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:37,408 INFO L225 Difference]: With dead ends: 519 [2022-01-31 21:33:37,408 INFO L226 Difference]: Without dead ends: 333 [2022-01-31 21:33:37,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 657 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=205, Invalid=1775, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:33:37,409 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2523 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 2533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:37,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 92 Invalid, 2533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2523 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:37,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2022-01-31 21:33:37,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 310. [2022-01-31 21:33:37,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 295 states have (on average 1.1796610169491526) internal successors, (348), 298 states have internal predecessors, (348), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:37,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 365 transitions. [2022-01-31 21:33:37,687 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 365 transitions. Word has length 67 [2022-01-31 21:33:37,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:37,687 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 365 transitions. [2022-01-31 21:33:37,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4878048780487805) internal successors, (61), 39 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:37,687 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 365 transitions. [2022-01-31 21:33:37,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:33:37,688 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:37,688 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:37,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2022-01-31 21:33:37,688 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:37,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:37,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1659666819, now seen corresponding path program 105 times [2022-01-31 21:33:37,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:37,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641154018] [2022-01-31 21:33:37,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:37,716 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:37,716 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:33:37,745 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:37,771 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:37,771 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:37,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:37,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:37,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:37,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:37,860 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:37,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:37,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:38,569 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:38,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641154018] [2022-01-31 21:33:38,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [641154018] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:38,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:38,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:33:38,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567486092] [2022-01-31 21:33:38,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:38,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:33:38,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:38,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:33:38,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1690, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:33:38,571 INFO L87 Difference]: Start difference. First operand 310 states and 365 transitions. Second operand has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:39,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:39,417 INFO L93 Difference]: Finished difference Result 530 states and 628 transitions. [2022-01-31 21:33:39,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:33:39,417 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-01-31 21:33:39,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:39,418 INFO L225 Difference]: With dead ends: 530 [2022-01-31 21:33:39,418 INFO L226 Difference]: Without dead ends: 333 [2022-01-31 21:33:39,418 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=212, Invalid=1858, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:33:39,418 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 71 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 2282 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 2292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:39,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 65 Invalid, 2292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2282 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:39,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2022-01-31 21:33:39,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 313. [2022-01-31 21:33:39,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 298 states have (on average 1.1812080536912752) internal successors, (352), 301 states have internal predecessors, (352), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:39,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 369 transitions. [2022-01-31 21:33:39,698 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 369 transitions. Word has length 67 [2022-01-31 21:33:39,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:39,698 INFO L470 AbstractCegarLoop]: Abstraction has 313 states and 369 transitions. [2022-01-31 21:33:39,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 40 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:39,698 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 369 transitions. [2022-01-31 21:33:39,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-01-31 21:33:39,698 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:39,698 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:39,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2022-01-31 21:33:39,699 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:39,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:39,699 INFO L85 PathProgramCache]: Analyzing trace with hash 420722915, now seen corresponding path program 6 times [2022-01-31 21:33:39,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:39,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240952071] [2022-01-31 21:33:39,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:39,728 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:39,753 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:39,753 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:39,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:39,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:39,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:39,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:39,790 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:39,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:39,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:39,893 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:39,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240952071] [2022-01-31 21:33:39,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [240952071] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:39,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:39,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:33:39,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567173142] [2022-01-31 21:33:39,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:39,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:33:39,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:39,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:33:39,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:33:39,894 INFO L87 Difference]: Start difference. First operand 313 states and 369 transitions. Second operand has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:33:40,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:40,379 INFO L93 Difference]: Finished difference Result 569 states and 677 transitions. [2022-01-31 21:33:40,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:33:40,391 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2022-01-31 21:33:40,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:40,392 INFO L225 Difference]: With dead ends: 569 [2022-01-31 21:33:40,392 INFO L226 Difference]: Without dead ends: 374 [2022-01-31 21:33:40,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 12 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:33:40,392 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 91 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:40,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 30 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:33:40,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-01-31 21:33:40,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 340. [2022-01-31 21:33:40,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 325 states have (on average 1.1753846153846155) internal successors, (382), 328 states have internal predecessors, (382), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:40,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 399 transitions. [2022-01-31 21:33:40,676 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 399 transitions. Word has length 69 [2022-01-31 21:33:40,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:40,677 INFO L470 AbstractCegarLoop]: Abstraction has 340 states and 399 transitions. [2022-01-31 21:33:40,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.9473684210526314) internal successors, (56), 18 states have internal predecessors, (56), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:33:40,677 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 399 transitions. [2022-01-31 21:33:40,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:40,677 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:40,677 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:40,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2022-01-31 21:33:40,677 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:40,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:40,677 INFO L85 PathProgramCache]: Analyzing trace with hash -899647012, now seen corresponding path program 106 times [2022-01-31 21:33:40,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:40,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338619937] [2022-01-31 21:33:40,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:40,710 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:40,753 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:40,753 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:40,784 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:40,822 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:40,823 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:40,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:40,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:40,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:40,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:40,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:40,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:41,795 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:41,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338619937] [2022-01-31 21:33:41,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1338619937] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:41,796 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:41,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:33:41,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879508375] [2022-01-31 21:33:41,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:41,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:33:41,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:41,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:33:41,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:33:41,796 INFO L87 Difference]: Start difference. First operand 340 states and 399 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:42,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:42,830 INFO L93 Difference]: Finished difference Result 614 states and 715 transitions. [2022-01-31 21:33:42,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:33:42,830 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:42,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:42,831 INFO L225 Difference]: With dead ends: 614 [2022-01-31 21:33:42,831 INFO L226 Difference]: Without dead ends: 401 [2022-01-31 21:33:42,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:33:42,831 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 44 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 1654 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 1664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:42,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 66 Invalid, 1664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1654 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:33:42,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-01-31 21:33:43,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 343. [2022-01-31 21:33:43,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:43,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:43,150 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:43,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:43,150 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:43,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:43,150 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:43,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:43,151 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:43,151 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:43,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120 [2022-01-31 21:33:43,151 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:43,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:43,151 INFO L85 PathProgramCache]: Analyzing trace with hash -455746338, now seen corresponding path program 107 times [2022-01-31 21:33:43,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:43,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220325421] [2022-01-31 21:33:43,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:43,185 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:43,208 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:43,208 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:43,232 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:43,261 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:43,261 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:43,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:43,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:43,354 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:43,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:43,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:43,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:43,358 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:44,263 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:44,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220325421] [2022-01-31 21:33:44,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1220325421] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:44,264 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:44,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:33:44,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174974424] [2022-01-31 21:33:44,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:44,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:33:44,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:44,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:33:44,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:33:44,264 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:45,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:45,458 INFO L93 Difference]: Finished difference Result 617 states and 718 transitions. [2022-01-31 21:33:45,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:33:45,473 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:45,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:45,473 INFO L225 Difference]: With dead ends: 617 [2022-01-31 21:33:45,473 INFO L226 Difference]: Without dead ends: 404 [2022-01-31 21:33:45,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:33:45,474 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1726 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:45,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 64 Invalid, 1737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1726 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:45,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2022-01-31 21:33:45,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 343. [2022-01-31 21:33:45,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:45,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:45,812 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:45,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:45,813 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:45,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:45,813 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:45,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:45,813 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:45,813 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:45,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2022-01-31 21:33:45,813 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:45,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:45,813 INFO L85 PathProgramCache]: Analyzing trace with hash -936826596, now seen corresponding path program 108 times [2022-01-31 21:33:45,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:45,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59555218] [2022-01-31 21:33:45,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:45,846 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:45,887 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:45,887 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:45,930 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:45,973 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:45,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:45,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:45,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:46,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:46,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:46,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:46,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:46,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:46,950 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:46,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59555218] [2022-01-31 21:33:46,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [59555218] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:46,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:46,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:33:46,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482753752] [2022-01-31 21:33:46,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:46,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:33:46,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:46,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:33:46,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=993, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:33:46,951 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:48,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:48,069 INFO L93 Difference]: Finished difference Result 614 states and 715 transitions. [2022-01-31 21:33:48,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:33:48,069 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:48,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:48,070 INFO L225 Difference]: With dead ends: 614 [2022-01-31 21:33:48,070 INFO L226 Difference]: Without dead ends: 401 [2022-01-31 21:33:48,070 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=139, Invalid=1121, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:33:48,070 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1833 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 1843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1833 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:48,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 62 Invalid, 1843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1833 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:33:48,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-01-31 21:33:48,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 343. [2022-01-31 21:33:48,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:48,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:48,408 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:48,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:48,408 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:48,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:48,408 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:48,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:48,409 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:48,409 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:48,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2022-01-31 21:33:48,409 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:48,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:48,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1289914978, now seen corresponding path program 109 times [2022-01-31 21:33:48,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:48,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682023297] [2022-01-31 21:33:48,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:48,450 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:48,489 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:48,489 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:48,522 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:48,562 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:48,562 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:48,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:48,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:48,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:48,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:48,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:48,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:48,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:49,432 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:49,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682023297] [2022-01-31 21:33:49,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [682023297] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:49,433 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:49,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:33:49,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600371462] [2022-01-31 21:33:49,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:49,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:33:49,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:49,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:33:49,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:33:49,433 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:50,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:50,494 INFO L93 Difference]: Finished difference Result 611 states and 712 transitions. [2022-01-31 21:33:50,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:33:50,494 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:50,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:50,494 INFO L225 Difference]: With dead ends: 611 [2022-01-31 21:33:50,494 INFO L226 Difference]: Without dead ends: 398 [2022-01-31 21:33:50,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:33:50,495 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 1817 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:50,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 58 Invalid, 1827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1817 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:33:50,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2022-01-31 21:33:50,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 343. [2022-01-31 21:33:50,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:50,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:50,840 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:50,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:50,840 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:50,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:50,841 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:50,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:50,841 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:50,841 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:50,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable123 [2022-01-31 21:33:50,841 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:50,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:50,841 INFO L85 PathProgramCache]: Analyzing trace with hash 955664476, now seen corresponding path program 110 times [2022-01-31 21:33:50,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:50,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184413622] [2022-01-31 21:33:50,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:50,885 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:50,914 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:50,914 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:50,952 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:50,978 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:50,978 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:50,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:50,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:51,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:51,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:51,074 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:51,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:51,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:51,974 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:51,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184413622] [2022-01-31 21:33:51,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1184413622] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:51,975 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:51,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:33:51,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079250473] [2022-01-31 21:33:51,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:51,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:33:51,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:51,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:33:51,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:33:51,976 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:53,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:53,230 INFO L93 Difference]: Finished difference Result 608 states and 709 transitions. [2022-01-31 21:33:53,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:33:53,230 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:53,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:53,231 INFO L225 Difference]: With dead ends: 608 [2022-01-31 21:33:53,231 INFO L226 Difference]: Without dead ends: 395 [2022-01-31 21:33:53,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=153, Invalid=1253, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:33:53,232 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1985 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1995 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1985 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:53,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 70 Invalid, 1995 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1985 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:53,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2022-01-31 21:33:53,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 343. [2022-01-31 21:33:53,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:53,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:53,582 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:53,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:53,582 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:53,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:53,582 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:53,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:53,583 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:53,583 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:53,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2022-01-31 21:33:53,584 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:53,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:53,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1379311198, now seen corresponding path program 111 times [2022-01-31 21:33:53,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:53,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095687429] [2022-01-31 21:33:53,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:53,631 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:53,675 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:53,675 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:53,730 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:53,760 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:53,760 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:53,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:53,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:53,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:53,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:53,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:53,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:53,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:54,825 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:54,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095687429] [2022-01-31 21:33:54,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1095687429] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:54,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:54,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:33:54,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153497332] [2022-01-31 21:33:54,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:54,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:33:54,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:54,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:33:54,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1182, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:33:54,826 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:55,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:55,957 INFO L93 Difference]: Finished difference Result 605 states and 706 transitions. [2022-01-31 21:33:55,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:33:55,957 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:55,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:55,958 INFO L225 Difference]: With dead ends: 605 [2022-01-31 21:33:55,958 INFO L226 Difference]: Without dead ends: 392 [2022-01-31 21:33:55,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=160, Invalid=1322, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:33:55,958 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 1968 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 1978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1968 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:55,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 66 Invalid, 1978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1968 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:33:55,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2022-01-31 21:33:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 343. [2022-01-31 21:33:56,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:56,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:56,316 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:56,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:56,316 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:56,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:56,317 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:56,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:56,317 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:56,317 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:56,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2022-01-31 21:33:56,317 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:56,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:56,317 INFO L85 PathProgramCache]: Analyzing trace with hash 349951900, now seen corresponding path program 112 times [2022-01-31 21:33:56,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:56,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234266358] [2022-01-31 21:33:56,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:56,347 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:56,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:56,378 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:56,417 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:56,453 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:56,453 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:56,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:56,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:56,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:56,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:56,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:56,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:56,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:57,547 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:57,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234266358] [2022-01-31 21:33:57,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1234266358] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:57,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:57,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:33:57,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659840408] [2022-01-31 21:33:57,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:57,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:33:57,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:57,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:33:57,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1249, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:33:57,548 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:58,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:58,806 INFO L93 Difference]: Finished difference Result 602 states and 703 transitions. [2022-01-31 21:33:58,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:33:58,806 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:33:58,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:58,807 INFO L225 Difference]: With dead ends: 602 [2022-01-31 21:33:58,807 INFO L226 Difference]: Without dead ends: 389 [2022-01-31 21:33:58,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:33:58,808 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 70 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2068 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2079 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:58,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 66 Invalid, 2079 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2068 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:33:58,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-01-31 21:33:59,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 343. [2022-01-31 21:33:59,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:33:59,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:33:59,160 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:33:59,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:59,161 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:33:59,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:33:59,161 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:33:59,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:33:59,161 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:59,161 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:59,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126 [2022-01-31 21:33:59,161 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:59,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:59,161 INFO L85 PathProgramCache]: Analyzing trace with hash -494053602, now seen corresponding path program 113 times [2022-01-31 21:33:59,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:59,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2355729] [2022-01-31 21:33:59,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:59,195 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:59,239 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:59,239 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:59,272 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:59,312 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:59,313 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:59,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:59,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:59,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:59,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:59,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:33:59,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:59,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:00,094 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:00,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2355729] [2022-01-31 21:34:00,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2355729] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:00,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:00,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:34:00,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638966795] [2022-01-31 21:34:00,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:00,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:34:00,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:00,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:34:00,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1318, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:34:00,096 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:01,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:01,224 INFO L93 Difference]: Finished difference Result 599 states and 700 transitions. [2022-01-31 21:34:01,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:34:01,224 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:01,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:01,225 INFO L225 Difference]: With dead ends: 599 [2022-01-31 21:34:01,225 INFO L226 Difference]: Without dead ends: 386 [2022-01-31 21:34:01,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 757 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=174, Invalid=1466, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:34:01,226 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 77 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1936 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:01,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 56 Invalid, 1947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1936 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:34:01,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2022-01-31 21:34:01,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 343. [2022-01-31 21:34:01,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:01,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:01,581 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:01,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:01,581 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:01,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:01,581 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:01,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:01,581 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:01,581 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:01,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127 [2022-01-31 21:34:01,582 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:01,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:01,582 INFO L85 PathProgramCache]: Analyzing trace with hash -219293988, now seen corresponding path program 114 times [2022-01-31 21:34:01,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:01,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668423402] [2022-01-31 21:34:01,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:01,615 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,649 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,649 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:01,684 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,716 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,716 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:01,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:01,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:01,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:01,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:01,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:01,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:01,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:02,865 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:02,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668423402] [2022-01-31 21:34:02,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1668423402] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:02,865 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:02,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:34:02,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35300247] [2022-01-31 21:34:02,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:02,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:34:02,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:02,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:34:02,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1389, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:34:02,866 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:04,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:04,001 INFO L93 Difference]: Finished difference Result 596 states and 697 transitions. [2022-01-31 21:34:04,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:34:04,001 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:04,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:04,002 INFO L225 Difference]: With dead ends: 596 [2022-01-31 21:34:04,002 INFO L226 Difference]: Without dead ends: 383 [2022-01-31 21:34:04,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=181, Invalid=1541, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:34:04,002 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2058 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:04,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 66 Invalid, 2068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2058 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:34:04,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2022-01-31 21:34:04,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 343. [2022-01-31 21:34:04,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:04,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:04,357 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:04,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:04,357 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:04,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:04,357 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:04,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:04,357 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:04,357 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:04,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2022-01-31 21:34:04,357 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:04,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:04,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1166909406, now seen corresponding path program 115 times [2022-01-31 21:34:04,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:04,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631810931] [2022-01-31 21:34:04,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:04,388 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:04,426 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:04,427 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:04,459 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:04,497 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:04,497 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:04,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:04,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:04,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:04,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:04,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:05,697 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:05,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631810931] [2022-01-31 21:34:05,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1631810931] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:05,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:05,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:34:05,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903819831] [2022-01-31 21:34:05,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:05,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:34:05,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:05,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:34:05,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1462, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:34:05,699 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:07,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:07,011 INFO L93 Difference]: Finished difference Result 593 states and 694 transitions. [2022-01-31 21:34:07,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:34:07,012 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:07,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:07,012 INFO L225 Difference]: With dead ends: 593 [2022-01-31 21:34:07,012 INFO L226 Difference]: Without dead ends: 380 [2022-01-31 21:34:07,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=188, Invalid=1618, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:34:07,013 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 67 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 2521 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 2532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:07,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 83 Invalid, 2532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2521 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:07,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2022-01-31 21:34:07,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 343. [2022-01-31 21:34:07,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:07,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:07,371 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:07,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:07,371 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:07,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:07,371 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:07,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:07,372 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:07,372 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:07,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2022-01-31 21:34:07,372 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:07,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:07,372 INFO L85 PathProgramCache]: Analyzing trace with hash 1228949020, now seen corresponding path program 116 times [2022-01-31 21:34:07,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:07,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560280540] [2022-01-31 21:34:07,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:07,411 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:07,455 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:07,455 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:07,505 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:07,537 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:07,537 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:07,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:07,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:07,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:07,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:07,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:07,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:07,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:08,810 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:08,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560280540] [2022-01-31 21:34:08,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1560280540] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:08,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:08,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:34:08,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687078795] [2022-01-31 21:34:08,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:08,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:34:08,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:08,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:34:08,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1537, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:34:08,812 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:10,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:10,047 INFO L93 Difference]: Finished difference Result 590 states and 691 transitions. [2022-01-31 21:34:10,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:34:10,047 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:10,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:10,048 INFO L225 Difference]: With dead ends: 590 [2022-01-31 21:34:10,048 INFO L226 Difference]: Without dead ends: 377 [2022-01-31 21:34:10,048 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 781 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=195, Invalid=1697, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:34:10,048 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 63 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 2317 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 2327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:10,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 72 Invalid, 2327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2317 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:10,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2022-01-31 21:34:10,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 343. [2022-01-31 21:34:10,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:10,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:10,422 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:10,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:10,422 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:10,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.6) internal successors, (64), 38 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:10,422 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:10,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:10,423 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:10,423 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:10,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130 [2022-01-31 21:34:10,423 INFO L402 AbstractCegarLoop]: === Iteration 132 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:10,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:10,423 INFO L85 PathProgramCache]: Analyzing trace with hash -576489314, now seen corresponding path program 117 times [2022-01-31 21:34:10,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:10,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490016227] [2022-01-31 21:34:10,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:10,469 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:10,503 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:10,503 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:10,536 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:10,567 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:10,567 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:10,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:10,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:10,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:10,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:10,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:10,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:10,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:11,820 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:11,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490016227] [2022-01-31 21:34:11,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1490016227] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:11,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:11,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:34:11,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263233591] [2022-01-31 21:34:11,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:11,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:34:11,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:11,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:34:11,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1614, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:34:11,821 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:13,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:13,142 INFO L93 Difference]: Finished difference Result 587 states and 688 transitions. [2022-01-31 21:34:13,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:34:13,143 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:13,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:13,143 INFO L225 Difference]: With dead ends: 587 [2022-01-31 21:34:13,143 INFO L226 Difference]: Without dead ends: 374 [2022-01-31 21:34:13,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 771 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=1778, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:34:13,144 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 2551 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 2562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:13,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 74 Invalid, 2562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2551 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:13,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-01-31 21:34:13,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 343. [2022-01-31 21:34:13,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:13,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:13,508 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:13,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:13,508 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:13,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5609756097560976) internal successors, (64), 39 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:13,508 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:13,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:13,508 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:13,508 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:13,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2022-01-31 21:34:13,509 INFO L402 AbstractCegarLoop]: === Iteration 133 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:13,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:13,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1394137764, now seen corresponding path program 118 times [2022-01-31 21:34:13,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:13,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380464814] [2022-01-31 21:34:13,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:13,560 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:13,606 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:13,606 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:13,651 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:13,694 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:13,694 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:13,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:13,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:13,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:13,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:13,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:13,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:13,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:14,648 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:14,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380464814] [2022-01-31 21:34:14,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1380464814] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:14,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:14,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:34:14,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136237036] [2022-01-31 21:34:14,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:14,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:34:14,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:14,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:34:14,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1693, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:34:14,649 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:15,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:15,929 INFO L93 Difference]: Finished difference Result 584 states and 685 transitions. [2022-01-31 21:34:15,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:34:15,929 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:15,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:15,930 INFO L225 Difference]: With dead ends: 584 [2022-01-31 21:34:15,930 INFO L226 Difference]: Without dead ends: 371 [2022-01-31 21:34:15,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=209, Invalid=1861, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:34:15,930 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 2740 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 2750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2740 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:15,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 74 Invalid, 2750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2740 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:15,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-01-31 21:34:16,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 343. [2022-01-31 21:34:16,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:16,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:16,294 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:16,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:16,294 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:16,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 40 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:16,294 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:16,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:16,295 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:16,295 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:16,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132 [2022-01-31 21:34:16,295 INFO L402 AbstractCegarLoop]: === Iteration 134 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:16,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:16,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1312481630, now seen corresponding path program 119 times [2022-01-31 21:34:16,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:16,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529467689] [2022-01-31 21:34:16,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:16,328 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:16,363 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:16,363 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:16,413 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:16,456 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:16,456 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:16,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:16,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:16,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:16,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:16,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:16,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:16,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:17,592 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:17,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529467689] [2022-01-31 21:34:17,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1529467689] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:17,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:17,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:34:17,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942206264] [2022-01-31 21:34:17,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:17,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:34:17,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:17,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:34:17,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1774, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:34:17,593 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:18,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:18,749 INFO L93 Difference]: Finished difference Result 582 states and 683 transitions. [2022-01-31 21:34:18,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:34:18,749 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:18,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:18,750 INFO L225 Difference]: With dead ends: 582 [2022-01-31 21:34:18,750 INFO L226 Difference]: Without dead ends: 369 [2022-01-31 21:34:18,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=216, Invalid=1946, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:34:18,750 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 72 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 2503 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 2513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:18,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 62 Invalid, 2513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2503 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:34:18,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2022-01-31 21:34:19,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 343. [2022-01-31 21:34:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 328 states have (on average 1.173780487804878) internal successors, (385), 331 states have internal predecessors, (385), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:19,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 402 transitions. [2022-01-31 21:34:19,113 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 402 transitions. Word has length 70 [2022-01-31 21:34:19,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:19,113 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 402 transitions. [2022-01-31 21:34:19,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 41 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:19,113 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 402 transitions. [2022-01-31 21:34:19,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:34:19,113 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:19,113 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:19,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133 [2022-01-31 21:34:19,113 INFO L402 AbstractCegarLoop]: === Iteration 135 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:19,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:19,114 INFO L85 PathProgramCache]: Analyzing trace with hash 301364380, now seen corresponding path program 120 times [2022-01-31 21:34:19,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:19,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244991826] [2022-01-31 21:34:19,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:19,152 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:19,152 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:34:19,186 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:19,221 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:19,222 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:19,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:19,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:19,315 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:19,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:19,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:19,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:19,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:20,344 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:20,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244991826] [2022-01-31 21:34:20,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1244991826] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:20,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:20,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:34:20,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056224394] [2022-01-31 21:34:20,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:20,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:34:20,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:20,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:34:20,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:34:20,345 INFO L87 Difference]: Start difference. First operand 343 states and 402 transitions. Second operand has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:21,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:21,628 INFO L93 Difference]: Finished difference Result 593 states and 698 transitions. [2022-01-31 21:34:21,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:34:21,629 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-01-31 21:34:21,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:21,629 INFO L225 Difference]: With dead ends: 593 [2022-01-31 21:34:21,629 INFO L226 Difference]: Without dead ends: 369 [2022-01-31 21:34:21,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 6 SyntacticMatches, 15 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=223, Invalid=2033, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:34:21,630 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2631 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:21,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 70 Invalid, 2642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2631 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:34:21,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2022-01-31 21:34:22,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 346. [2022-01-31 21:34:22,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 331 states have (on average 1.1752265861027191) internal successors, (389), 334 states have internal predecessors, (389), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:22,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 406 transitions. [2022-01-31 21:34:22,023 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 406 transitions. Word has length 70 [2022-01-31 21:34:22,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:22,023 INFO L470 AbstractCegarLoop]: Abstraction has 346 states and 406 transitions. [2022-01-31 21:34:22,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 42 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:22,023 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 406 transitions. [2022-01-31 21:34:22,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:22,023 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:22,023 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:22,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2022-01-31 21:34:22,024 INFO L402 AbstractCegarLoop]: === Iteration 136 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:22,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:22,024 INFO L85 PathProgramCache]: Analyzing trace with hash -5032545, now seen corresponding path program 121 times [2022-01-31 21:34:22,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:22,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687614364] [2022-01-31 21:34:22,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:22,078 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,113 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,113 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:22,148 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,190 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,190 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:22,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:22,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:22,304 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:22,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:22,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:22,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:22,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:23,289 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:23,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687614364] [2022-01-31 21:34:23,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1687614364] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:23,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:23,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:34:23,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474215015] [2022-01-31 21:34:23,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:23,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:34:23,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:23,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:34:23,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:34:23,291 INFO L87 Difference]: Start difference. First operand 346 states and 406 transitions. Second operand has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:24,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:24,566 INFO L93 Difference]: Finished difference Result 623 states and 725 transitions. [2022-01-31 21:34:24,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:34:24,567 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:24,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:24,567 INFO L225 Difference]: With dead ends: 623 [2022-01-31 21:34:24,567 INFO L226 Difference]: Without dead ends: 410 [2022-01-31 21:34:24,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:34:24,568 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 1961 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:24,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 70 Invalid, 1972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1961 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:34:24,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-01-31 21:34:24,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 349. [2022-01-31 21:34:24,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:24,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:24,972 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:24,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:24,972 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:24,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:24,972 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:24,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:24,972 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:24,972 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:24,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable135 [2022-01-31 21:34:24,972 INFO L402 AbstractCegarLoop]: === Iteration 137 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:24,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:24,973 INFO L85 PathProgramCache]: Analyzing trace with hash 35642205, now seen corresponding path program 122 times [2022-01-31 21:34:24,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:24,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450672227] [2022-01-31 21:34:24,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:25,017 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:25,062 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:25,062 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:25,107 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:25,139 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:25,140 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:25,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:25,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:25,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:25,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:25,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:25,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:25,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:26,304 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:26,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450672227] [2022-01-31 21:34:26,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [450672227] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:26,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:26,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:34:26,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266878427] [2022-01-31 21:34:26,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:26,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:34:26,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:26,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:34:26,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:34:26,305 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:27,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:27,636 INFO L93 Difference]: Finished difference Result 626 states and 728 transitions. [2022-01-31 21:34:27,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:34:27,637 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:27,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:27,637 INFO L225 Difference]: With dead ends: 626 [2022-01-31 21:34:27,637 INFO L226 Difference]: Without dead ends: 413 [2022-01-31 21:34:27,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=136, Invalid=1124, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:34:27,638 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1818 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:27,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 56 Invalid, 1828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1818 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:34:27,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2022-01-31 21:34:28,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 349. [2022-01-31 21:34:28,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:28,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:28,052 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:28,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:28,053 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:28,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:28,053 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:28,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:28,053 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:28,053 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:28,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2022-01-31 21:34:28,053 INFO L402 AbstractCegarLoop]: === Iteration 138 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:28,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:28,053 INFO L85 PathProgramCache]: Analyzing trace with hash 479542879, now seen corresponding path program 123 times [2022-01-31 21:34:28,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:28,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675020922] [2022-01-31 21:34:28,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:28,093 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:28,128 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:28,128 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:28,156 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:28,191 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:28,191 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:28,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:28,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:28,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:28,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:28,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:28,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:28,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:29,352 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:29,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675020922] [2022-01-31 21:34:29,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [675020922] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:29,352 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:29,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:34:29,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891258524] [2022-01-31 21:34:29,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:29,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:34:29,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:29,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:34:29,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:34:29,353 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:30,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:30,897 INFO L93 Difference]: Finished difference Result 623 states and 725 transitions. [2022-01-31 21:34:30,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:34:30,897 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:30,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:30,898 INFO L225 Difference]: With dead ends: 623 [2022-01-31 21:34:30,898 INFO L226 Difference]: Without dead ends: 410 [2022-01-31 21:34:30,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:34:30,899 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 2207 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 2218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:30,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 79 Invalid, 2218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2207 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:34:30,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-01-31 21:34:31,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 349. [2022-01-31 21:34:31,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:31,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:31,324 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:31,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:31,324 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:31,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:31,324 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:31,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:31,325 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:31,325 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:31,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2022-01-31 21:34:31,325 INFO L402 AbstractCegarLoop]: === Iteration 139 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:31,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:31,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1537379, now seen corresponding path program 124 times [2022-01-31 21:34:31,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:31,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610425037] [2022-01-31 21:34:31,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:31,357 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:31,393 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:31,393 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:31,421 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:31,454 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:31,455 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:31,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:31,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:31,576 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:31,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:31,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:31,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:31,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:32,565 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:32,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610425037] [2022-01-31 21:34:32,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1610425037] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:32,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:32,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:34:32,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210537550] [2022-01-31 21:34:32,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:32,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:34:32,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:32,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:34:32,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1120, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:34:32,566 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:33,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:33,848 INFO L93 Difference]: Finished difference Result 620 states and 722 transitions. [2022-01-31 21:34:33,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:34:33,848 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:33,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:33,848 INFO L225 Difference]: With dead ends: 620 [2022-01-31 21:34:33,848 INFO L226 Difference]: Without dead ends: 407 [2022-01-31 21:34:33,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=150, Invalid=1256, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:34:33,849 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1970 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:33,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 64 Invalid, 1980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1970 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:34:33,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-01-31 21:34:34,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 349. [2022-01-31 21:34:34,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:34,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:34,282 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:34,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:34,282 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:34,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:34,283 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:34,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:34,283 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:34,283 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:34,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138 [2022-01-31 21:34:34,283 INFO L402 AbstractCegarLoop]: === Iteration 140 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:34,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:34,283 INFO L85 PathProgramCache]: Analyzing trace with hash -354625761, now seen corresponding path program 125 times [2022-01-31 21:34:34,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:34,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912139607] [2022-01-31 21:34:34,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:34,312 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:34,334 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:34,334 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:34,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:34,376 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:34,376 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:34,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:34,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:34,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:34,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:34,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:34,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:34,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:35,491 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:35,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912139607] [2022-01-31 21:34:35,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [912139607] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:35,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:35,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:34:35,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199016161] [2022-01-31 21:34:35,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:35,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:34:35,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:35,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:34:35,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1185, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:34:35,493 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:37,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:37,079 INFO L93 Difference]: Finished difference Result 617 states and 719 transitions. [2022-01-31 21:34:37,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:34:37,079 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:37,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:37,080 INFO L225 Difference]: With dead ends: 617 [2022-01-31 21:34:37,080 INFO L226 Difference]: Without dead ends: 404 [2022-01-31 21:34:37,080 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=157, Invalid=1325, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:34:37,080 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 53 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 2517 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 2528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:37,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 97 Invalid, 2528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2517 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:37,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2022-01-31 21:34:37,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 349. [2022-01-31 21:34:37,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:37,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:37,540 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:37,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:37,540 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:37,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:37,540 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:37,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:37,541 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:37,541 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:37,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2022-01-31 21:34:37,541 INFO L402 AbstractCegarLoop]: === Iteration 141 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:37,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:37,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1890953693, now seen corresponding path program 126 times [2022-01-31 21:34:37,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:37,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220408442] [2022-01-31 21:34:37,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:37,580 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:37,616 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:37,616 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:37,644 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:37,669 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:37,669 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:37,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:37,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:37,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:37,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:37,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:37,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:37,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:38,877 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:38,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220408442] [2022-01-31 21:34:38,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [220408442] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:38,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:38,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:34:38,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868479906] [2022-01-31 21:34:38,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:38,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:34:38,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:38,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:34:38,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1252, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:34:38,878 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:40,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:40,459 INFO L93 Difference]: Finished difference Result 614 states and 716 transitions. [2022-01-31 21:34:40,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:34:40,459 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:40,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:40,460 INFO L225 Difference]: With dead ends: 614 [2022-01-31 21:34:40,460 INFO L226 Difference]: Without dead ends: 401 [2022-01-31 21:34:40,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=164, Invalid=1396, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:34:40,460 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 2432 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 2442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:40,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 88 Invalid, 2442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2432 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:40,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-01-31 21:34:40,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 349. [2022-01-31 21:34:40,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:40,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:40,898 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:40,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:40,898 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:40,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:40,898 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:40,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:40,898 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:40,899 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:40,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2022-01-31 21:34:40,899 INFO L402 AbstractCegarLoop]: === Iteration 142 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:40,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:40,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1980366881, now seen corresponding path program 127 times [2022-01-31 21:34:40,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:40,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996130755] [2022-01-31 21:34:40,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:40,935 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:40,980 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:40,980 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:41,014 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:41,055 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:41,056 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:41,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:41,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:41,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:41,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:41,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:41,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:41,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:42,300 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:42,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996130755] [2022-01-31 21:34:42,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1996130755] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:42,301 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:42,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:34:42,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658105959] [2022-01-31 21:34:42,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:42,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:34:42,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:42,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:34:42,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1321, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:34:42,301 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:43,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:43,756 INFO L93 Difference]: Finished difference Result 611 states and 713 transitions. [2022-01-31 21:34:43,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:34:43,756 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:43,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:43,757 INFO L225 Difference]: With dead ends: 611 [2022-01-31 21:34:43,757 INFO L226 Difference]: Without dead ends: 398 [2022-01-31 21:34:43,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:34:43,764 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 2234 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:43,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 68 Invalid, 2244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2234 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:34:43,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2022-01-31 21:34:44,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 349. [2022-01-31 21:34:44,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:44,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:44,211 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:44,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:44,211 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:44,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:44,211 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:44,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:44,211 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:44,211 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:44,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141 [2022-01-31 21:34:44,212 INFO L402 AbstractCegarLoop]: === Iteration 143 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:44,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:44,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1285241117, now seen corresponding path program 128 times [2022-01-31 21:34:44,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:44,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374097470] [2022-01-31 21:34:44,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:44,245 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,279 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,279 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:44,325 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,367 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,368 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:44,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:44,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:44,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:44,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:44,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:44,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:44,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:45,312 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:45,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374097470] [2022-01-31 21:34:45,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [374097470] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:45,313 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:45,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:34:45,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209573090] [2022-01-31 21:34:45,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:45,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:34:45,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:45,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:34:45,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1392, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:34:45,313 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:46,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:46,599 INFO L93 Difference]: Finished difference Result 608 states and 710 transitions. [2022-01-31 21:34:46,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:34:46,600 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:46,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:46,600 INFO L225 Difference]: With dead ends: 608 [2022-01-31 21:34:46,600 INFO L226 Difference]: Without dead ends: 395 [2022-01-31 21:34:46,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=178, Invalid=1544, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:34:46,601 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 2618 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 2628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:46,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 76 Invalid, 2628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2618 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:34:46,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2022-01-31 21:34:47,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 349. [2022-01-31 21:34:47,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:47,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:47,062 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:47,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:47,063 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:47,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:47,063 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:47,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:47,063 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:47,063 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:47,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2022-01-31 21:34:47,063 INFO L402 AbstractCegarLoop]: === Iteration 144 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:47,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:47,063 INFO L85 PathProgramCache]: Analyzing trace with hash 441235615, now seen corresponding path program 129 times [2022-01-31 21:34:47,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:47,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962361723] [2022-01-31 21:34:47,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:47,093 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:47,119 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:47,119 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:47,148 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:47,174 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:47,174 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:47,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:47,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:47,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:47,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:47,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:47,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:47,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:48,028 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:48,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962361723] [2022-01-31 21:34:48,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [962361723] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:48,029 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:48,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:34:48,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078422030] [2022-01-31 21:34:48,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:48,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:34:48,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:48,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:34:48,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1465, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:34:48,030 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:49,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:49,497 INFO L93 Difference]: Finished difference Result 605 states and 707 transitions. [2022-01-31 21:34:49,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:34:49,497 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:49,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:49,498 INFO L225 Difference]: With dead ends: 605 [2022-01-31 21:34:49,498 INFO L226 Difference]: Without dead ends: 392 [2022-01-31 21:34:49,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=185, Invalid=1621, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:34:49,498 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 2439 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 2450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:49,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 2450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2439 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:49,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2022-01-31 21:34:49,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 349. [2022-01-31 21:34:49,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:49,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:49,955 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:49,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:49,955 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:49,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:49,955 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:49,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:49,956 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:49,956 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:49,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2022-01-31 21:34:49,956 INFO L402 AbstractCegarLoop]: === Iteration 145 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:49,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:49,956 INFO L85 PathProgramCache]: Analyzing trace with hash 715995229, now seen corresponding path program 130 times [2022-01-31 21:34:49,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:49,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811200009] [2022-01-31 21:34:49,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:49,995 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:50,031 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:50,031 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:50,059 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:50,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:50,097 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:50,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:50,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:50,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:50,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:50,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:50,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:50,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:51,386 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:51,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811200009] [2022-01-31 21:34:51,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1811200009] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:51,387 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:51,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:34:51,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972286158] [2022-01-31 21:34:51,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:51,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:34:51,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:51,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:34:51,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1540, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:34:51,388 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:52,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:52,861 INFO L93 Difference]: Finished difference Result 602 states and 704 transitions. [2022-01-31 21:34:52,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:34:52,861 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:52,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:52,862 INFO L225 Difference]: With dead ends: 602 [2022-01-31 21:34:52,862 INFO L226 Difference]: Without dead ends: 389 [2022-01-31 21:34:52,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=192, Invalid=1700, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:34:52,862 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 2537 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:52,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 86 Invalid, 2547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2537 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:34:52,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-01-31 21:34:53,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 349. [2022-01-31 21:34:53,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:53,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:53,323 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:53,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:53,323 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:53,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:53,323 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:53,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:53,324 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:53,324 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:53,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2022-01-31 21:34:53,324 INFO L402 AbstractCegarLoop]: === Iteration 146 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:53,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:53,324 INFO L85 PathProgramCache]: Analyzing trace with hash 2102198623, now seen corresponding path program 131 times [2022-01-31 21:34:53,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:53,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378421925] [2022-01-31 21:34:53,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:53,363 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:53,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:53,390 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:53,442 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:53,482 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:53,482 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:53,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:53,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:53,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:53,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:53,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:53,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:53,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:54,614 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:54,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378421925] [2022-01-31 21:34:54,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [378421925] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:54,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:54,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:34:54,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133286086] [2022-01-31 21:34:54,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:54,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:34:54,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:54,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:34:54,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1617, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:34:54,615 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:56,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:56,102 INFO L93 Difference]: Finished difference Result 599 states and 701 transitions. [2022-01-31 21:34:56,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:34:56,102 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:56,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:56,103 INFO L225 Difference]: With dead ends: 599 [2022-01-31 21:34:56,103 INFO L226 Difference]: Without dead ends: 386 [2022-01-31 21:34:56,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 864 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:34:56,103 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2706 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 2717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:56,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 75 Invalid, 2717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2706 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:34:56,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2022-01-31 21:34:56,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 349. [2022-01-31 21:34:56,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:56,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:56,552 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:56,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:56,553 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:56,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6341463414634145) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:56,553 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:56,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:56,553 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:56,553 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:56,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145 [2022-01-31 21:34:56,553 INFO L402 AbstractCegarLoop]: === Iteration 147 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:56,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:56,553 INFO L85 PathProgramCache]: Analyzing trace with hash -2130729059, now seen corresponding path program 132 times [2022-01-31 21:34:56,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:56,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064765797] [2022-01-31 21:34:56,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:56,600 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,643 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,643 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:56,676 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,716 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,716 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:56,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:56,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:56,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:34:56,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:56,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:57,995 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:57,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064765797] [2022-01-31 21:34:57,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1064765797] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:57,995 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:57,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:34:57,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372721770] [2022-01-31 21:34:57,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:57,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:34:57,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:57,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:34:57,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1696, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:34:57,996 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:59,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:59,470 INFO L93 Difference]: Finished difference Result 596 states and 698 transitions. [2022-01-31 21:34:59,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:34:59,471 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:34:59,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:59,471 INFO L225 Difference]: With dead ends: 596 [2022-01-31 21:34:59,471 INFO L226 Difference]: Without dead ends: 383 [2022-01-31 21:34:59,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=206, Invalid=1864, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:34:59,472 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 66 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2762 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:59,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 70 Invalid, 2772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2762 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:34:59,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2022-01-31 21:34:59,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 349. [2022-01-31 21:34:59,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:34:59,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:34:59,931 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:34:59,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:59,931 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:34:59,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 40 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:34:59,931 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:34:59,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:34:59,931 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:59,931 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:59,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2022-01-31 21:34:59,931 INFO L402 AbstractCegarLoop]: === Iteration 148 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:59,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:59,932 INFO L85 PathProgramCache]: Analyzing trace with hash 358799903, now seen corresponding path program 133 times [2022-01-31 21:34:59,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:59,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559731970] [2022-01-31 21:34:59,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:59,961 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:59,997 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:59,997 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:00,026 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:00,065 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:00,065 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:00,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:00,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:00,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:00,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:00,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:00,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:00,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:01,431 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:01,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559731970] [2022-01-31 21:35:01,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559731970] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:01,431 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:01,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:35:01,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041238024] [2022-01-31 21:35:01,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:01,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:35:01,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:01,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:35:01,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1777, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:35:01,432 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:02,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:02,770 INFO L93 Difference]: Finished difference Result 593 states and 695 transitions. [2022-01-31 21:35:02,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:35:02,770 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:35:02,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:02,771 INFO L225 Difference]: With dead ends: 593 [2022-01-31 21:35:02,771 INFO L226 Difference]: Without dead ends: 380 [2022-01-31 21:35:02,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=213, Invalid=1949, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:35:02,772 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2379 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:02,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 70 Invalid, 2389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2379 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:02,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2022-01-31 21:35:03,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 349. [2022-01-31 21:35:03,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:03,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:35:03,225 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:35:03,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:03,226 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:35:03,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.558139534883721) internal successors, (67), 41 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:03,226 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:35:03,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:35:03,226 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:03,226 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:03,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable147 [2022-01-31 21:35:03,226 INFO L402 AbstractCegarLoop]: === Iteration 149 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:03,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:03,226 INFO L85 PathProgramCache]: Analyzing trace with hash -458848547, now seen corresponding path program 134 times [2022-01-31 21:35:03,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:03,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662465714] [2022-01-31 21:35:03,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:03,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:03,306 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:03,306 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:03,352 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:03,394 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:03,394 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:03,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:03,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:03,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:03,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:03,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:03,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:03,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:04,623 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:04,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662465714] [2022-01-31 21:35:04,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [662465714] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:04,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:04,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:35:04,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117675242] [2022-01-31 21:35:04,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:04,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:35:04,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:04,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:35:04,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1860, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:35:04,624 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:05,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:05,720 INFO L93 Difference]: Finished difference Result 590 states and 692 transitions. [2022-01-31 21:35:05,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:35:05,720 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:35:05,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:05,721 INFO L225 Difference]: With dead ends: 590 [2022-01-31 21:35:05,721 INFO L226 Difference]: Without dead ends: 377 [2022-01-31 21:35:05,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=220, Invalid=2036, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:35:05,721 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2342 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 2352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:05,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 58 Invalid, 2352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2342 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:35:05,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2022-01-31 21:35:06,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 349. [2022-01-31 21:35:06,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:06,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:35:06,189 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:35:06,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:06,189 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:35:06,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 42 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:06,190 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:35:06,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:35:06,190 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:06,190 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:06,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2022-01-31 21:35:06,190 INFO L402 AbstractCegarLoop]: === Iteration 150 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:06,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:06,190 INFO L85 PathProgramCache]: Analyzing trace with hash -2047196449, now seen corresponding path program 135 times [2022-01-31 21:35:06,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:06,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365451671] [2022-01-31 21:35:06,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:06,212 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:06,239 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:06,240 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:06,268 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:06,294 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:06,294 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:06,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:06,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:06,366 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:06,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:06,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:06,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:06,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:07,253 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:07,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365451671] [2022-01-31 21:35:07,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1365451671] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:07,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:07,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:35:07,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336694303] [2022-01-31 21:35:07,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:07,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:35:07,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:07,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:35:07,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1945, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:35:07,255 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:08,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:08,468 INFO L93 Difference]: Finished difference Result 588 states and 690 transitions. [2022-01-31 21:35:08,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:35:08,468 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:35:08,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:08,469 INFO L225 Difference]: With dead ends: 588 [2022-01-31 21:35:08,469 INFO L226 Difference]: Without dead ends: 375 [2022-01-31 21:35:08,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=227, Invalid=2125, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:35:08,470 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 74 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2640 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 2650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:08,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 56 Invalid, 2650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2640 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:08,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-01-31 21:35:08,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 349. [2022-01-31 21:35:08,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 334 states have (on average 1.1736526946107784) internal successors, (392), 337 states have internal predecessors, (392), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:08,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 409 transitions. [2022-01-31 21:35:08,929 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 409 transitions. Word has length 73 [2022-01-31 21:35:08,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:08,929 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 409 transitions. [2022-01-31 21:35:08,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.488888888888889) internal successors, (67), 43 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:08,929 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 409 transitions. [2022-01-31 21:35:08,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:35:08,930 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:08,930 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:08,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2022-01-31 21:35:08,930 INFO L402 AbstractCegarLoop]: === Iteration 151 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:08,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:08,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1236653597, now seen corresponding path program 136 times [2022-01-31 21:35:08,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:08,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461201819] [2022-01-31 21:35:08,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:09,001 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:09,002 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:35:09,031 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:09,076 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:09,076 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:09,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:09,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:09,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:09,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:09,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:09,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:09,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:10,090 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:10,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461201819] [2022-01-31 21:35:10,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [461201819] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:10,091 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:10,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:35:10,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750956324] [2022-01-31 21:35:10,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:10,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:35:10,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:10,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:35:10,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2032, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:35:10,092 INFO L87 Difference]: Start difference. First operand 349 states and 409 transitions. Second operand has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:11,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:11,416 INFO L93 Difference]: Finished difference Result 599 states and 705 transitions. [2022-01-31 21:35:11,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:35:11,416 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-01-31 21:35:11,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:11,417 INFO L225 Difference]: With dead ends: 599 [2022-01-31 21:35:11,417 INFO L226 Difference]: Without dead ends: 375 [2022-01-31 21:35:11,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=234, Invalid=2216, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:35:11,417 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 3525 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 3536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:11,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 105 Invalid, 3536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3525 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:11,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-01-31 21:35:11,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 352. [2022-01-31 21:35:11,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 337 states have (on average 1.175074183976261) internal successors, (396), 340 states have internal predecessors, (396), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:11,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 413 transitions. [2022-01-31 21:35:11,872 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 413 transitions. Word has length 73 [2022-01-31 21:35:11,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:11,872 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 413 transitions. [2022-01-31 21:35:11,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 44 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:11,873 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 413 transitions. [2022-01-31 21:35:11,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-01-31 21:35:11,873 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:11,873 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:11,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150 [2022-01-31 21:35:11,873 INFO L402 AbstractCegarLoop]: === Iteration 152 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:11,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:11,873 INFO L85 PathProgramCache]: Analyzing trace with hash -482247245, now seen corresponding path program 7 times [2022-01-31 21:35:11,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:11,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894049856] [2022-01-31 21:35:11,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:11,901 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:11,926 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:11,926 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:11,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:11,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:11,989 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:11,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:11,991 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:11,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:11,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:12,116 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:12,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894049856] [2022-01-31 21:35:12,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1894049856] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:12,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:12,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:35:12,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429996217] [2022-01-31 21:35:12,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:12,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:35:12,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:12,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:35:12,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:35:12,117 INFO L87 Difference]: Start difference. First operand 352 states and 413 transitions. Second operand has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:35:12,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:12,897 INFO L93 Difference]: Finished difference Result 638 states and 754 transitions. [2022-01-31 21:35:12,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:35:12,898 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 75 [2022-01-31 21:35:12,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:12,898 INFO L225 Difference]: With dead ends: 638 [2022-01-31 21:35:12,898 INFO L226 Difference]: Without dead ends: 416 [2022-01-31 21:35:12,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 24 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=244, Invalid=568, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:35:12,899 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 95 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:12,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 31 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:35:12,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2022-01-31 21:35:13,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 379. [2022-01-31 21:35:13,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 364 states have (on average 1.1703296703296704) internal successors, (426), 367 states have internal predecessors, (426), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:13,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 443 transitions. [2022-01-31 21:35:13,358 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 443 transitions. Word has length 75 [2022-01-31 21:35:13,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:13,359 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 443 transitions. [2022-01-31 21:35:13,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.9523809523809526) internal successors, (62), 20 states have internal predecessors, (62), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:35:13,359 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 443 transitions. [2022-01-31 21:35:13,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:13,359 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:13,359 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:13,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2022-01-31 21:35:13,359 INFO L402 AbstractCegarLoop]: === Iteration 153 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:13,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:13,359 INFO L85 PathProgramCache]: Analyzing trace with hash 1182482172, now seen corresponding path program 137 times [2022-01-31 21:35:13,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:13,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905600654] [2022-01-31 21:35:13,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:13,393 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:13,439 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:13,439 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:13,484 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:13,527 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:13,527 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:13,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:13,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:13,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:13,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:13,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:13,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:13,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:14,557 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:14,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905600654] [2022-01-31 21:35:14,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1905600654] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:14,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:14,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:35:14,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140434572] [2022-01-31 21:35:14,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:14,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:35:14,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:14,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:35:14,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=999, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:35:14,558 INFO L87 Difference]: Start difference. First operand 379 states and 443 transitions. Second operand has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:16,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:16,211 INFO L93 Difference]: Finished difference Result 689 states and 798 transitions. [2022-01-31 21:35:16,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:35:16,212 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:16,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:16,212 INFO L225 Difference]: With dead ends: 689 [2022-01-31 21:35:16,212 INFO L226 Difference]: Without dead ends: 449 [2022-01-31 21:35:16,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:35:16,214 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2332 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:16,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 87 Invalid, 2343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2332 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:16,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2022-01-31 21:35:16,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 382. [2022-01-31 21:35:16,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:16,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:16,719 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:16,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:16,720 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:16,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:16,720 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:16,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:16,720 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:16,720 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:16,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2022-01-31 21:35:16,720 INFO L402 AbstractCegarLoop]: === Iteration 154 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:16,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:16,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1743181950, now seen corresponding path program 138 times [2022-01-31 21:35:16,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:16,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993110954] [2022-01-31 21:35:16,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:16,760 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:16,823 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:16,823 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:16,857 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:16,917 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:16,917 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:16,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:17,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:17,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:17,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:17,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:17,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:18,110 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:18,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993110954] [2022-01-31 21:35:18,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1993110954] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:18,110 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:18,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:35:18,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186483822] [2022-01-31 21:35:18,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:18,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:35:18,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:18,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:35:18,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:35:18,111 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:19,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:19,789 INFO L93 Difference]: Finished difference Result 692 states and 801 transitions. [2022-01-31 21:35:19,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:35:19,789 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:19,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:19,790 INFO L225 Difference]: With dead ends: 692 [2022-01-31 21:35:19,790 INFO L226 Difference]: Without dead ends: 452 [2022-01-31 21:35:19,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:35:19,791 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 1924 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:19,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 58 Invalid, 1934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1924 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:35:19,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-01-31 21:35:20,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 382. [2022-01-31 21:35:20,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:20,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:20,321 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:20,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:20,321 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:20,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:20,321 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:20,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:20,322 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:20,322 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:20,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153 [2022-01-31 21:35:20,322 INFO L402 AbstractCegarLoop]: === Iteration 155 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:20,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:20,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1783856700, now seen corresponding path program 139 times [2022-01-31 21:35:20,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:20,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562834550] [2022-01-31 21:35:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:20,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:20,400 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:20,400 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:20,433 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:20,474 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:20,474 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:20,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:20,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:20,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:20,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:20,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:20,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:20,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:21,739 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:21,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562834550] [2022-01-31 21:35:21,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [562834550] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:21,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:21,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:35:21,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115319485] [2022-01-31 21:35:21,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:21,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:35:21,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:21,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:35:21,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1123, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:35:21,741 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:23,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:23,471 INFO L93 Difference]: Finished difference Result 689 states and 798 transitions. [2022-01-31 21:35:23,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:35:23,472 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:23,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:23,472 INFO L225 Difference]: With dead ends: 689 [2022-01-31 21:35:23,472 INFO L226 Difference]: Without dead ends: 449 [2022-01-31 21:35:23,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=147, Invalid=1259, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:35:23,473 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 2086 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 2096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:23,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 64 Invalid, 2096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2086 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:23,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2022-01-31 21:35:24,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 382. [2022-01-31 21:35:24,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:24,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:24,007 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:24,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:24,007 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:24,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:24,007 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:24,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:24,007 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:24,007 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:24,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2022-01-31 21:35:24,007 INFO L402 AbstractCegarLoop]: === Iteration 156 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:24,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:24,008 INFO L85 PathProgramCache]: Analyzing trace with hash -2067209922, now seen corresponding path program 140 times [2022-01-31 21:35:24,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:24,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070715226] [2022-01-31 21:35:24,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:24,046 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:24,082 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:24,083 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:24,110 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:24,144 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:24,144 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:24,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:24,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:24,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:24,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:24,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:24,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:24,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:25,310 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:25,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070715226] [2022-01-31 21:35:25,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1070715226] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:25,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:25,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:35:25,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836046715] [2022-01-31 21:35:25,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:25,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:35:25,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:25,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:35:25,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1188, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:35:25,311 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:26,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:26,879 INFO L93 Difference]: Finished difference Result 686 states and 795 transitions. [2022-01-31 21:35:26,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:35:26,880 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:26,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:26,880 INFO L225 Difference]: With dead ends: 686 [2022-01-31 21:35:26,880 INFO L226 Difference]: Without dead ends: 446 [2022-01-31 21:35:26,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=154, Invalid=1328, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:35:26,881 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 2163 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:26,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 68 Invalid, 2173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2163 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:35:26,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2022-01-31 21:35:27,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 382. [2022-01-31 21:35:27,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:27,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:27,433 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:27,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:27,433 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:27,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:27,433 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:27,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:27,434 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:27,434 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:27,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2022-01-31 21:35:27,434 INFO L402 AbstractCegarLoop]: === Iteration 157 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:27,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:27,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1746677116, now seen corresponding path program 141 times [2022-01-31 21:35:27,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:27,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762964716] [2022-01-31 21:35:27,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:27,473 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:27,508 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:27,508 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:27,535 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:27,570 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:27,570 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:27,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:27,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:27,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:27,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:27,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:27,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:27,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:28,866 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:28,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762964716] [2022-01-31 21:35:28,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [762964716] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:28,867 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:28,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:35:28,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742341087] [2022-01-31 21:35:28,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:28,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:35:28,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:28,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:35:28,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1255, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:35:28,868 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:30,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:30,664 INFO L93 Difference]: Finished difference Result 683 states and 792 transitions. [2022-01-31 21:35:30,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:35:30,665 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:30,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:30,665 INFO L225 Difference]: With dead ends: 683 [2022-01-31 21:35:30,665 INFO L226 Difference]: Without dead ends: 443 [2022-01-31 21:35:30,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=161, Invalid=1399, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:35:30,666 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2173 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:30,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 66 Invalid, 2183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2173 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:30,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-01-31 21:35:31,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 382. [2022-01-31 21:35:31,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:31,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:31,235 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:31,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:31,235 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:31,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:31,235 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:31,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:31,236 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:31,236 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:31,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable156 [2022-01-31 21:35:31,236 INFO L402 AbstractCegarLoop]: === Iteration 158 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:31,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:31,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1393588734, now seen corresponding path program 142 times [2022-01-31 21:35:31,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:31,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710035007] [2022-01-31 21:35:31,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:31,269 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,302 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,303 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:31,349 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,380 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,380 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:31,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:31,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:31,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:31,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:31,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:31,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:31,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:32,357 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:32,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710035007] [2022-01-31 21:35:32,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [710035007] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:32,357 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:32,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:35:32,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227799212] [2022-01-31 21:35:32,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:32,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:35:32,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:32,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:35:32,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1324, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:35:32,358 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:34,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:34,012 INFO L93 Difference]: Finished difference Result 680 states and 789 transitions. [2022-01-31 21:35:34,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:35:34,012 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:34,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:34,013 INFO L225 Difference]: With dead ends: 680 [2022-01-31 21:35:34,013 INFO L226 Difference]: Without dead ends: 440 [2022-01-31 21:35:34,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=168, Invalid=1472, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:35:34,013 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 2456 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:34,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 87 Invalid, 2467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2456 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:34,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2022-01-31 21:35:34,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 382. [2022-01-31 21:35:34,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:34,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:34,574 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:34,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:34,574 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:34,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:34,574 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:34,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:34,575 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:34,575 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:34,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable157 [2022-01-31 21:35:34,575 INFO L402 AbstractCegarLoop]: === Iteration 159 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:34,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:34,575 INFO L85 PathProgramCache]: Analyzing trace with hash -655799108, now seen corresponding path program 143 times [2022-01-31 21:35:34,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:34,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600148447] [2022-01-31 21:35:34,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:34,604 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:34,639 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:34,639 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:34,676 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:34,717 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:34,717 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:34,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:34,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:34,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:34,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:34,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:34,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:34,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:35,646 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:35,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600148447] [2022-01-31 21:35:35,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [600148447] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:35,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:35,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:35:35,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008455931] [2022-01-31 21:35:35,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:35,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:35:35,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:35,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:35:35,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1395, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:35:35,647 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:37,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:37,479 INFO L93 Difference]: Finished difference Result 677 states and 786 transitions. [2022-01-31 21:35:37,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:35:37,479 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:37,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:37,479 INFO L225 Difference]: With dead ends: 677 [2022-01-31 21:35:37,479 INFO L226 Difference]: Without dead ends: 437 [2022-01-31 21:35:37,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=175, Invalid=1547, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:35:37,481 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 2576 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:37,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 84 Invalid, 2586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2576 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:35:37,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2022-01-31 21:35:38,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 382. [2022-01-31 21:35:38,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:38,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:38,053 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:38,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:38,053 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:38,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:38,053 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:38,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:38,053 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:38,053 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:38,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2022-01-31 21:35:38,053 INFO L402 AbstractCegarLoop]: === Iteration 160 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:38,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:38,054 INFO L85 PathProgramCache]: Analyzing trace with hash -232152386, now seen corresponding path program 144 times [2022-01-31 21:35:38,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:38,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490285176] [2022-01-31 21:35:38,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:38,093 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:38,128 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:38,128 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:38,165 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:38,199 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:38,199 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:38,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:38,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:38,291 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:38,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:38,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:38,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:39,259 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:39,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490285176] [2022-01-31 21:35:39,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [490285176] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:39,260 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:39,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:35:39,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897087952] [2022-01-31 21:35:39,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:39,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:35:39,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:39,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:35:39,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1468, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:35:39,261 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:41,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:41,061 INFO L93 Difference]: Finished difference Result 674 states and 783 transitions. [2022-01-31 21:35:41,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:35:41,061 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:41,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:41,087 INFO L225 Difference]: With dead ends: 674 [2022-01-31 21:35:41,088 INFO L226 Difference]: Without dead ends: 434 [2022-01-31 21:35:41,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 887 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:35:41,088 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 2633 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 2644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2633 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:41,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 72 Invalid, 2644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2633 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:41,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-01-31 21:35:41,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 382. [2022-01-31 21:35:41,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:41,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:41,682 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:41,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:41,682 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:41,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:41,683 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:41,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:41,683 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:41,683 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:41,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2022-01-31 21:35:41,683 INFO L402 AbstractCegarLoop]: === Iteration 161 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:41,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:41,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1261511684, now seen corresponding path program 145 times [2022-01-31 21:35:41,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:41,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328105780] [2022-01-31 21:35:41,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:41,724 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:41,756 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:41,756 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:41,789 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:41,827 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:41,827 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:41,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:41,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:41,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:41,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:41,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:41,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:41,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:43,069 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:43,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328105780] [2022-01-31 21:35:43,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1328105780] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:43,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:43,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:35:43,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811164558] [2022-01-31 21:35:43,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:43,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:35:43,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:43,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:35:43,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1543, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:35:43,070 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:44,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:44,909 INFO L93 Difference]: Finished difference Result 671 states and 780 transitions. [2022-01-31 21:35:44,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:35:44,909 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:44,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:44,910 INFO L225 Difference]: With dead ends: 671 [2022-01-31 21:35:44,910 INFO L226 Difference]: Without dead ends: 431 [2022-01-31 21:35:44,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=189, Invalid=1703, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:35:44,910 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 3124 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 3135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:44,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 93 Invalid, 3135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3124 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:35:44,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2022-01-31 21:35:45,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 382. [2022-01-31 21:35:45,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:45,519 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:45,519 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:45,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:45,519 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:45,520 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:45,520 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:45,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable160 [2022-01-31 21:35:45,520 INFO L402 AbstractCegarLoop]: === Iteration 162 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:45,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:45,520 INFO L85 PathProgramCache]: Analyzing trace with hash -2105517186, now seen corresponding path program 146 times [2022-01-31 21:35:45,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:45,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187932485] [2022-01-31 21:35:45,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:45,553 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:45,597 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:45,598 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:45,630 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:45,670 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:45,671 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:45,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:45,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:45,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:45,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:45,765 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:45,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:45,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:46,989 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:46,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187932485] [2022-01-31 21:35:46,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1187932485] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:46,989 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:46,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:35:46,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315816741] [2022-01-31 21:35:46,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:46,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:35:46,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:46,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:35:46,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:35:46,990 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:48,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:48,717 INFO L93 Difference]: Finished difference Result 668 states and 777 transitions. [2022-01-31 21:35:48,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:35:48,717 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:48,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:48,717 INFO L225 Difference]: With dead ends: 668 [2022-01-31 21:35:48,718 INFO L226 Difference]: Without dead ends: 428 [2022-01-31 21:35:48,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=196, Invalid=1784, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:35:48,718 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2723 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:48,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 70 Invalid, 2733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2723 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:48,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2022-01-31 21:35:49,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 382. [2022-01-31 21:35:49,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:49,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:49,294 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:49,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:49,295 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:49,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:49,295 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:49,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:49,295 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:49,295 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:49,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2022-01-31 21:35:49,295 INFO L402 AbstractCegarLoop]: === Iteration 163 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:49,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:49,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1830757572, now seen corresponding path program 147 times [2022-01-31 21:35:49,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:49,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079800469] [2022-01-31 21:35:49,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:49,332 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:49,372 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:49,373 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:49,416 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:49,457 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:49,457 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:49,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:49,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:49,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:49,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:49,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:49,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:49,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:50,863 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:50,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079800469] [2022-01-31 21:35:50,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1079800469] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:50,864 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:50,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:35:50,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267719560] [2022-01-31 21:35:50,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:50,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:35:50,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:50,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:35:50,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1699, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:35:50,864 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:52,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:52,511 INFO L93 Difference]: Finished difference Result 665 states and 774 transitions. [2022-01-31 21:35:52,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:35:52,511 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:52,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:52,512 INFO L225 Difference]: With dead ends: 665 [2022-01-31 21:35:52,512 INFO L226 Difference]: Without dead ends: 425 [2022-01-31 21:35:52,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:35:52,512 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 2640 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 2651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:52,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 71 Invalid, 2651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2640 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:52,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-01-31 21:35:53,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 382. [2022-01-31 21:35:53,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:53,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:53,091 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:53,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:53,091 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:53,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:53,091 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:53,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:53,092 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:53,092 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:53,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable162 [2022-01-31 21:35:53,092 INFO L402 AbstractCegarLoop]: === Iteration 164 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:53,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:53,092 INFO L85 PathProgramCache]: Analyzing trace with hash -444554178, now seen corresponding path program 148 times [2022-01-31 21:35:53,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:53,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917994041] [2022-01-31 21:35:53,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:53,122 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:53,158 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:53,159 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:53,202 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:53,231 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:53,231 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:53,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:53,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:53,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:53,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:53,338 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:53,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:53,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:54,523 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:54,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917994041] [2022-01-31 21:35:54,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [917994041] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:54,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:54,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:35:54,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369297235] [2022-01-31 21:35:54,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:54,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:35:54,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:54,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:35:54,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1780, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:35:54,524 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:56,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:56,153 INFO L93 Difference]: Finished difference Result 662 states and 771 transitions. [2022-01-31 21:35:56,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:35:56,153 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:56,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:56,154 INFO L225 Difference]: With dead ends: 662 [2022-01-31 21:35:56,154 INFO L226 Difference]: Without dead ends: 422 [2022-01-31 21:35:56,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=210, Invalid=1952, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:35:56,154 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 2908 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:56,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 86 Invalid, 2918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2908 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:56,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2022-01-31 21:35:56,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 382. [2022-01-31 21:35:56,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:35:56,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:35:56,734 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:35:56,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:56,734 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:35:56,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:56,735 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:35:56,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:35:56,735 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:56,735 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:56,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163 [2022-01-31 21:35:56,735 INFO L402 AbstractCegarLoop]: === Iteration 165 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:56,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:56,735 INFO L85 PathProgramCache]: Analyzing trace with hash -382514564, now seen corresponding path program 149 times [2022-01-31 21:35:56,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:56,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93234439] [2022-01-31 21:35:56,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:56,768 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:56,813 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:56,813 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:56,846 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:56,886 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:56,886 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:56,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:56,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:56,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:56,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:35:56,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:57,977 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:57,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93234439] [2022-01-31 21:35:57,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [93234439] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:57,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:57,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:35:57,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961549909] [2022-01-31 21:35:57,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:57,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:35:57,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:57,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:35:57,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1863, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:35:57,978 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:35:59,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:59,512 INFO L93 Difference]: Finished difference Result 659 states and 768 transitions. [2022-01-31 21:35:59,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:35:59,512 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:35:59,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:59,513 INFO L225 Difference]: With dead ends: 659 [2022-01-31 21:35:59,513 INFO L226 Difference]: Without dead ends: 419 [2022-01-31 21:35:59,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=217, Invalid=2039, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:35:59,513 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 3030 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 3041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:59,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 94 Invalid, 3041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3030 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:35:59,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2022-01-31 21:36:00,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 382. [2022-01-31 21:36:00,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:00,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:36:00,214 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:36:00,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:00,214 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:36:00,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5909090909090908) internal successors, (70), 42 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:00,214 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:36:00,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:36:00,214 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:00,215 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:00,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2022-01-31 21:36:00,215 INFO L402 AbstractCegarLoop]: === Iteration 166 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:00,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:00,215 INFO L85 PathProgramCache]: Analyzing trace with hash 2107014398, now seen corresponding path program 150 times [2022-01-31 21:36:00,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:00,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658304278] [2022-01-31 21:36:00,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:00,255 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:00,291 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:00,291 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:00,328 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:00,354 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:00,355 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:00,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:00,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:00,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:00,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:00,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:00,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:00,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:01,748 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:01,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658304278] [2022-01-31 21:36:01,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1658304278] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:01,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:01,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:36:01,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952071578] [2022-01-31 21:36:01,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:01,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:36:01,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:01,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:36:01,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1948, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:36:01,749 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:03,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:03,389 INFO L93 Difference]: Finished difference Result 656 states and 765 transitions. [2022-01-31 21:36:03,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:36:03,389 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:36:03,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:03,390 INFO L225 Difference]: With dead ends: 656 [2022-01-31 21:36:03,390 INFO L226 Difference]: Without dead ends: 416 [2022-01-31 21:36:03,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=224, Invalid=2128, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:36:03,390 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 79 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 3005 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 3016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:03,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 79 Invalid, 3016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3005 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:03,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2022-01-31 21:36:03,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 382. [2022-01-31 21:36:03,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:03,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:36:03,974 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:36:03,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:03,975 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:36:03,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 43 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:03,975 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:36:03,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:36:03,975 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:03,975 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:03,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable165 [2022-01-31 21:36:03,975 INFO L402 AbstractCegarLoop]: === Iteration 167 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:03,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:03,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1289365948, now seen corresponding path program 151 times [2022-01-31 21:36:03,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:03,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660272767] [2022-01-31 21:36:03,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:04,014 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:04,049 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:04,049 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:04,077 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:04,103 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:04,103 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:04,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:04,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:04,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:04,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:04,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:04,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:04,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:05,459 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:05,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660272767] [2022-01-31 21:36:05,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [660272767] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:05,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:05,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:36:05,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963490905] [2022-01-31 21:36:05,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:05,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:36:05,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:05,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:36:05,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=2035, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:36:05,460 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:07,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:07,269 INFO L93 Difference]: Finished difference Result 653 states and 762 transitions. [2022-01-31 21:36:07,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:36:07,269 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:36:07,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:07,270 INFO L225 Difference]: With dead ends: 653 [2022-01-31 21:36:07,270 INFO L226 Difference]: Without dead ends: 413 [2022-01-31 21:36:07,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=231, Invalid=2219, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:36:07,270 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 3473 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 3484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:07,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 99 Invalid, 3484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3473 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:36:07,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2022-01-31 21:36:07,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 382. [2022-01-31 21:36:07,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:07,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:36:07,849 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:36:07,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:07,849 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:36:07,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 44 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:07,849 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:36:07,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:36:07,849 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:07,850 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:07,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable166 [2022-01-31 21:36:07,850 INFO L402 AbstractCegarLoop]: === Iteration 168 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:07,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:07,850 INFO L85 PathProgramCache]: Analyzing trace with hash -298981954, now seen corresponding path program 152 times [2022-01-31 21:36:07,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:07,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554838408] [2022-01-31 21:36:07,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:07,879 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:07,913 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:07,913 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:07,951 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:07,977 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:07,978 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:07,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:07,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:08,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:08,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:08,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:08,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:08,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:09,225 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:09,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554838408] [2022-01-31 21:36:09,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [554838408] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:09,225 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:09,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:36:09,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426246947] [2022-01-31 21:36:09,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:09,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:36:09,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:09,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:36:09,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2124, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:36:09,226 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:10,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:10,800 INFO L93 Difference]: Finished difference Result 651 states and 760 transitions. [2022-01-31 21:36:10,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:36:10,800 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:36:10,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:10,801 INFO L225 Difference]: With dead ends: 651 [2022-01-31 21:36:10,801 INFO L226 Difference]: Without dead ends: 411 [2022-01-31 21:36:10,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 867 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=238, Invalid=2312, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:36:10,802 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 76 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 3006 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 3016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3006 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:10,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 56 Invalid, 3016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3006 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:36:10,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2022-01-31 21:36:11,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 382. [2022-01-31 21:36:11,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 367 states have (on average 1.1689373297002725) internal successors, (429), 370 states have internal predecessors, (429), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:11,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 446 transitions. [2022-01-31 21:36:11,502 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 446 transitions. Word has length 76 [2022-01-31 21:36:11,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:11,502 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 446 transitions. [2022-01-31 21:36:11,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 45 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:11,502 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 446 transitions. [2022-01-31 21:36:11,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:36:11,502 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:11,502 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:11,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2022-01-31 21:36:11,503 INFO L402 AbstractCegarLoop]: === Iteration 169 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:11,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:11,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1310099204, now seen corresponding path program 153 times [2022-01-31 21:36:11,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:11,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179639696] [2022-01-31 21:36:11,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:11,547 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:11,547 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:36:11,595 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:11,635 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:11,635 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:11,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:11,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:11,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:11,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:11,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:11,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:11,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:12,825 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:12,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179639696] [2022-01-31 21:36:12,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [179639696] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:12,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:12,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:36:12,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996333227] [2022-01-31 21:36:12,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:12,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:36:12,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:12,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:36:12,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=2215, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:36:12,826 INFO L87 Difference]: Start difference. First operand 382 states and 446 transitions. Second operand has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:14,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:14,251 INFO L93 Difference]: Finished difference Result 662 states and 775 transitions. [2022-01-31 21:36:14,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:36:14,252 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-01-31 21:36:14,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:14,253 INFO L225 Difference]: With dead ends: 662 [2022-01-31 21:36:14,253 INFO L226 Difference]: Without dead ends: 411 [2022-01-31 21:36:14,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 17 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=245, Invalid=2407, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:36:14,253 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 89 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 3052 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 3064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:14,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 68 Invalid, 3064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3052 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:36:14,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2022-01-31 21:36:14,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 385. [2022-01-31 21:36:14,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 370 states have (on average 1.1702702702702703) internal successors, (433), 373 states have internal predecessors, (433), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:14,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 450 transitions. [2022-01-31 21:36:14,843 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 450 transitions. Word has length 76 [2022-01-31 21:36:14,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:14,843 INFO L470 AbstractCegarLoop]: Abstraction has 385 states and 450 transitions. [2022-01-31 21:36:14,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 46 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:14,843 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 450 transitions. [2022-01-31 21:36:14,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:14,844 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:14,844 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:14,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable168 [2022-01-31 21:36:14,844 INFO L402 AbstractCegarLoop]: === Iteration 170 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:14,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:14,844 INFO L85 PathProgramCache]: Analyzing trace with hash 787799167, now seen corresponding path program 154 times [2022-01-31 21:36:14,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:14,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73877049] [2022-01-31 21:36:14,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:14,872 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:14,927 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:14,927 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:14,955 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:15,002 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:15,003 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:15,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:15,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:15,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:15,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:15,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:15,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:15,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:16,166 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:16,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73877049] [2022-01-31 21:36:16,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [73877049] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:16,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:16,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:36:16,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899356501] [2022-01-31 21:36:16,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:16,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:36:16,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:16,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:36:16,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1063, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:36:16,168 INFO L87 Difference]: Start difference. First operand 385 states and 450 transitions. Second operand has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:17,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:17,910 INFO L93 Difference]: Finished difference Result 698 states and 808 transitions. [2022-01-31 21:36:17,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:36:17,910 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:17,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:17,911 INFO L225 Difference]: With dead ends: 698 [2022-01-31 21:36:17,911 INFO L226 Difference]: Without dead ends: 458 [2022-01-31 21:36:17,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=137, Invalid=1195, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:36:17,912 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 2001 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 2011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2001 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:17,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 60 Invalid, 2011 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2001 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:36:17,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2022-01-31 21:36:18,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 388. [2022-01-31 21:36:18,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:18,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:18,540 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:18,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:18,540 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:18,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:18,540 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:18,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:18,540 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:18,540 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:18,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable169 [2022-01-31 21:36:18,541 INFO L402 AbstractCegarLoop]: === Iteration 171 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:18,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:18,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1467071421, now seen corresponding path program 155 times [2022-01-31 21:36:18,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:18,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346832037] [2022-01-31 21:36:18,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:18,576 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:18,651 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:18,651 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:18,692 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:18,740 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:18,741 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:18,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:18,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:18,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:18,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:18,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:18,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:18,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:19,913 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:19,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346832037] [2022-01-31 21:36:19,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1346832037] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:19,914 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:19,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:36:19,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766083080] [2022-01-31 21:36:19,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:19,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:36:19,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:19,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:36:19,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:36:19,915 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:22,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:22,031 INFO L93 Difference]: Finished difference Result 701 states and 811 transitions. [2022-01-31 21:36:22,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:36:22,032 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:22,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:22,032 INFO L225 Difference]: With dead ends: 701 [2022-01-31 21:36:22,032 INFO L226 Difference]: Without dead ends: 461 [2022-01-31 21:36:22,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=144, Invalid=1262, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:36:22,033 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2369 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 2379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:22,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 78 Invalid, 2379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2369 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:22,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-01-31 21:36:22,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 388. [2022-01-31 21:36:22,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:22,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:22,722 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:22,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:22,722 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:22,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:22,722 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:22,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:22,723 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:22,723 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:22,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2022-01-31 21:36:22,723 INFO L402 AbstractCegarLoop]: === Iteration 172 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:22,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:22,723 INFO L85 PathProgramCache]: Analyzing trace with hash 2027771199, now seen corresponding path program 156 times [2022-01-31 21:36:22,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:22,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587081506] [2022-01-31 21:36:22,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:22,770 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,803 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,803 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:22,842 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,869 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,870 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:22,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:22,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:22,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:22,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:22,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:22,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:22,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:24,045 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:24,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587081506] [2022-01-31 21:36:24,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [587081506] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:24,046 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:24,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:36:24,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167069948] [2022-01-31 21:36:24,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:24,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:36:24,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:24,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:36:24,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1191, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:36:24,046 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:26,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:26,046 INFO L93 Difference]: Finished difference Result 698 states and 808 transitions. [2022-01-31 21:36:26,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:36:26,046 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:26,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:26,047 INFO L225 Difference]: With dead ends: 698 [2022-01-31 21:36:26,047 INFO L226 Difference]: Without dead ends: 458 [2022-01-31 21:36:26,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=151, Invalid=1331, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:36:26,048 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 2162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:26,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 58 Invalid, 2162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2151 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:36:26,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2022-01-31 21:36:26,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 388. [2022-01-31 21:36:26,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:26,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:26,777 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:26,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:26,777 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:26,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:26,777 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:26,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:26,777 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:26,777 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:26,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171 [2022-01-31 21:36:26,777 INFO L402 AbstractCegarLoop]: === Iteration 173 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:26,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:26,778 INFO L85 PathProgramCache]: Analyzing trace with hash 2068445949, now seen corresponding path program 157 times [2022-01-31 21:36:26,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:26,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070166037] [2022-01-31 21:36:26,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:26,816 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:26,851 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:26,851 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:26,878 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:26,912 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:26,912 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:26,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:26,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:27,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:27,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:27,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:27,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:27,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:28,182 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:28,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070166037] [2022-01-31 21:36:28,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1070166037] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:28,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:28,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:36:28,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438385280] [2022-01-31 21:36:28,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:28,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:36:28,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:28,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:36:28,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1258, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:36:28,183 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:30,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:30,295 INFO L93 Difference]: Finished difference Result 695 states and 805 transitions. [2022-01-31 21:36:30,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:36:30,296 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:30,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:30,296 INFO L225 Difference]: With dead ends: 695 [2022-01-31 21:36:30,296 INFO L226 Difference]: Without dead ends: 455 [2022-01-31 21:36:30,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=158, Invalid=1402, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:36:30,297 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2342 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:30,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 70 Invalid, 2352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2342 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:36:30,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2022-01-31 21:36:30,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 388. [2022-01-31 21:36:30,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:30,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:30,993 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:30,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:30,993 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:30,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:30,993 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:30,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:30,993 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:30,993 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:30,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172 [2022-01-31 21:36:30,994 INFO L402 AbstractCegarLoop]: === Iteration 174 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:30,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:30,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1782620673, now seen corresponding path program 158 times [2022-01-31 21:36:30,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:30,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066706381] [2022-01-31 21:36:30,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:31,032 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:31,067 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:31,067 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:31,094 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:31,128 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:31,128 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:31,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:31,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:31,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:31,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:31,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:31,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:32,485 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:32,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066706381] [2022-01-31 21:36:32,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1066706381] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:32,486 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:32,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:36:32,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371259039] [2022-01-31 21:36:32,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:32,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:36:32,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:32,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:36:32,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:36:32,486 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:34,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:34,605 INFO L93 Difference]: Finished difference Result 692 states and 802 transitions. [2022-01-31 21:36:34,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:36:34,606 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:34,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:34,606 INFO L225 Difference]: With dead ends: 692 [2022-01-31 21:36:34,606 INFO L226 Difference]: Without dead ends: 452 [2022-01-31 21:36:34,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=165, Invalid=1475, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:36:34,607 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 2900 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:34,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 98 Invalid, 2911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2900 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:34,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-01-31 21:36:35,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 388. [2022-01-31 21:36:35,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:35,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:35,302 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:35,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:35,302 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:35,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:35,302 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:35,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:35,302 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:35,303 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:35,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2022-01-31 21:36:35,303 INFO L402 AbstractCegarLoop]: === Iteration 175 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:35,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:35,303 INFO L85 PathProgramCache]: Analyzing trace with hash 2031266365, now seen corresponding path program 159 times [2022-01-31 21:36:35,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:35,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851796315] [2022-01-31 21:36:35,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:35,334 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:35,362 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:35,362 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:35,401 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:35,428 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:35,428 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:35,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:35,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:35,522 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:35,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:35,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:35,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:35,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:36,689 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:36,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851796315] [2022-01-31 21:36:36,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [851796315] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:36,689 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:36,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:36:36,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393998338] [2022-01-31 21:36:36,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:36,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:36:36,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:36,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:36:36,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1398, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:36:36,690 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:38,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:38,708 INFO L93 Difference]: Finished difference Result 689 states and 799 transitions. [2022-01-31 21:36:38,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:36:38,708 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:38,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:38,709 INFO L225 Difference]: With dead ends: 689 [2022-01-31 21:36:38,709 INFO L226 Difference]: Without dead ends: 449 [2022-01-31 21:36:38,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=172, Invalid=1550, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:36:38,709 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 2545 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 2555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:38,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 82 Invalid, 2555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2545 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:36:38,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2022-01-31 21:36:39,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 388. [2022-01-31 21:36:39,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:39,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:39,408 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:39,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:39,408 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:39,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:39,408 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:39,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:39,408 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:39,409 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:39,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2022-01-31 21:36:39,409 INFO L402 AbstractCegarLoop]: === Iteration 176 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:39,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:39,409 INFO L85 PathProgramCache]: Analyzing trace with hash 1678177983, now seen corresponding path program 160 times [2022-01-31 21:36:39,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:39,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294758673] [2022-01-31 21:36:39,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:39,455 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:39,498 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:39,499 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:39,543 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:39,585 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:39,585 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:39,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:39,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:39,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:39,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:39,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:39,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:39,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:40,981 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:40,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294758673] [2022-01-31 21:36:40,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1294758673] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:40,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:40,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:36:40,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952568339] [2022-01-31 21:36:40,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:40,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:36:40,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:40,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:36:40,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1471, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:36:40,982 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:43,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:43,148 INFO L93 Difference]: Finished difference Result 686 states and 796 transitions. [2022-01-31 21:36:43,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:36:43,148 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:43,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:43,149 INFO L225 Difference]: With dead ends: 686 [2022-01-31 21:36:43,149 INFO L226 Difference]: Without dead ends: 446 [2022-01-31 21:36:43,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:36:43,149 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 2970 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 2981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:43,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 83 Invalid, 2981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2970 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:36:43,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2022-01-31 21:36:43,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 388. [2022-01-31 21:36:43,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:43,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:43,864 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:43,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:43,864 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:43,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:43,864 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:43,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:43,864 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:43,864 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:43,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2022-01-31 21:36:43,864 INFO L402 AbstractCegarLoop]: === Iteration 177 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:43,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:43,865 INFO L85 PathProgramCache]: Analyzing trace with hash -371209859, now seen corresponding path program 161 times [2022-01-31 21:36:43,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:43,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816275381] [2022-01-31 21:36:43,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:43,903 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:43,930 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:43,930 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:43,968 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:43,994 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:43,994 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:43,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:43,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:44,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:44,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:44,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:44,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:44,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:45,283 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:45,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816275381] [2022-01-31 21:36:45,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1816275381] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:45,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:45,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:36:45,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052397465] [2022-01-31 21:36:45,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:45,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:36:45,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:45,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:36:45,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1546, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:36:45,285 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:47,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:47,331 INFO L93 Difference]: Finished difference Result 683 states and 793 transitions. [2022-01-31 21:36:47,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:36:47,331 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:47,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:47,332 INFO L225 Difference]: With dead ends: 683 [2022-01-31 21:36:47,332 INFO L226 Difference]: Without dead ends: 443 [2022-01-31 21:36:47,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 952 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=186, Invalid=1706, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:36:47,332 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2697 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 2708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:47,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 75 Invalid, 2708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2697 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:47,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-01-31 21:36:48,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 388. [2022-01-31 21:36:48,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:48,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:48,076 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:48,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:48,076 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:48,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:48,077 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:48,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:48,077 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:48,077 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:48,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2022-01-31 21:36:48,077 INFO L402 AbstractCegarLoop]: === Iteration 178 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:48,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:48,077 INFO L85 PathProgramCache]: Analyzing trace with hash 52436863, now seen corresponding path program 162 times [2022-01-31 21:36:48,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:48,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798159509] [2022-01-31 21:36:48,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:48,106 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:48,142 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:48,142 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:48,176 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:48,217 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:48,218 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:48,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:48,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:48,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:48,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:48,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:48,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:48,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:49,660 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:49,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798159509] [2022-01-31 21:36:49,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [798159509] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:49,661 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:49,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:36:49,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109125303] [2022-01-31 21:36:49,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:49,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:36:49,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:49,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:36:49,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1623, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:36:49,662 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:51,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:51,683 INFO L93 Difference]: Finished difference Result 680 states and 790 transitions. [2022-01-31 21:36:51,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:36:51,683 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:51,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:51,683 INFO L225 Difference]: With dead ends: 680 [2022-01-31 21:36:51,683 INFO L226 Difference]: Without dead ends: 440 [2022-01-31 21:36:51,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=193, Invalid=1787, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:36:51,684 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 2850 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:51,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 86 Invalid, 2861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2850 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:36:51,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2022-01-31 21:36:52,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 388. [2022-01-31 21:36:52,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:52,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:52,404 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:52,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:52,404 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:52,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:52,404 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:52,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:52,404 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:52,404 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:52,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177 [2022-01-31 21:36:52,404 INFO L402 AbstractCegarLoop]: === Iteration 179 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:52,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:52,405 INFO L85 PathProgramCache]: Analyzing trace with hash -976922435, now seen corresponding path program 163 times [2022-01-31 21:36:52,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:52,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969502429] [2022-01-31 21:36:52,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:52,443 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:52,477 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:52,478 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:52,507 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:52,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:52,542 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:52,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:52,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:52,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:52,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:52,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:52,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:52,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:53,770 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:53,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969502429] [2022-01-31 21:36:53,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1969502429] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:53,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:53,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:36:53,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435531123] [2022-01-31 21:36:53,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:53,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:36:53,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:53,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:36:53,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1702, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:36:53,771 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:55,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:55,744 INFO L93 Difference]: Finished difference Result 677 states and 787 transitions. [2022-01-31 21:36:55,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:36:55,744 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:55,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:55,744 INFO L225 Difference]: With dead ends: 677 [2022-01-31 21:36:55,744 INFO L226 Difference]: Without dead ends: 437 [2022-01-31 21:36:55,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=200, Invalid=1870, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:36:55,745 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2779 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:55,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 66 Invalid, 2789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2779 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:55,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2022-01-31 21:36:56,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 388. [2022-01-31 21:36:56,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:36:56,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:36:56,466 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:36:56,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:56,466 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:36:56,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.7380952380952381) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:56,466 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:36:56,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:36:56,466 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:56,466 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:56,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2022-01-31 21:36:56,467 INFO L402 AbstractCegarLoop]: === Iteration 180 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:56,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:56,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1820927937, now seen corresponding path program 164 times [2022-01-31 21:36:56,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:56,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623215948] [2022-01-31 21:36:56,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:56,499 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:56,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:56,542 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:56,586 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:56,626 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:56,626 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:56,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:56,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:56,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:56,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:56,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:36:56,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:56,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:57,917 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:57,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623215948] [2022-01-31 21:36:57,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [623215948] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:57,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:57,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:36:57,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602412030] [2022-01-31 21:36:57,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:57,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:36:57,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:57,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:36:57,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1783, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:36:57,918 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:36:59,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:59,801 INFO L93 Difference]: Finished difference Result 674 states and 784 transitions. [2022-01-31 21:36:59,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:36:59,801 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:36:59,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:59,801 INFO L225 Difference]: With dead ends: 674 [2022-01-31 21:36:59,801 INFO L226 Difference]: Without dead ends: 434 [2022-01-31 21:36:59,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1030 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=207, Invalid=1955, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:36:59,802 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2806 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 2816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:59,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 78 Invalid, 2816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2806 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:36:59,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-01-31 21:37:00,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 388. [2022-01-31 21:37:00,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:00,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:00,533 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:00,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:00,533 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:00,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 41 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:00,533 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:00,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:00,533 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:00,534 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:00,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2022-01-31 21:37:00,534 INFO L402 AbstractCegarLoop]: === Iteration 181 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:00,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:00,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1546168323, now seen corresponding path program 165 times [2022-01-31 21:37:00,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:00,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145093040] [2022-01-31 21:37:00,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:00,572 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:00,606 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:00,607 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:00,634 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:00,668 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:00,668 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:00,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:00,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:00,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:00,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:00,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:00,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:00,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:01,926 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:01,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145093040] [2022-01-31 21:37:01,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1145093040] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:01,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:01,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:37:01,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234596060] [2022-01-31 21:37:01,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:01,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:37:01,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:01,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:37:01,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:37:01,928 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:04,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:04,008 INFO L93 Difference]: Finished difference Result 671 states and 781 transitions. [2022-01-31 21:37:04,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:37:04,008 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:04,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:04,008 INFO L225 Difference]: With dead ends: 671 [2022-01-31 21:37:04,009 INFO L226 Difference]: Without dead ends: 431 [2022-01-31 21:37:04,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:37:04,009 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 66 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 3318 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 3329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:04,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 89 Invalid, 3329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3318 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:37:04,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2022-01-31 21:37:04,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 388. [2022-01-31 21:37:04,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:04,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:04,744 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:04,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:04,744 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:04,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 42 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:04,744 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:04,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:04,745 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:04,745 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:04,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable180 [2022-01-31 21:37:04,745 INFO L402 AbstractCegarLoop]: === Iteration 182 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:04,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:04,745 INFO L85 PathProgramCache]: Analyzing trace with hash -159964929, now seen corresponding path program 166 times [2022-01-31 21:37:04,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:04,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153820566] [2022-01-31 21:37:04,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:04,774 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:04,808 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:04,808 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:04,835 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:04,861 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:04,861 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:04,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:04,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:04,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:04,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:04,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:04,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:04,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:06,141 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:06,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153820566] [2022-01-31 21:37:06,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1153820566] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:06,141 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:06,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:37:06,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258162497] [2022-01-31 21:37:06,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:06,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:37:06,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:06,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:37:06,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1951, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:37:06,142 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:08,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:08,176 INFO L93 Difference]: Finished difference Result 668 states and 778 transitions. [2022-01-31 21:37:08,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:37:08,177 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:08,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:08,177 INFO L225 Difference]: With dead ends: 668 [2022-01-31 21:37:08,177 INFO L226 Difference]: Without dead ends: 428 [2022-01-31 21:37:08,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=221, Invalid=2131, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:37:08,178 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 78 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 3514 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 3525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:08,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 86 Invalid, 3525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3514 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:37:08,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2022-01-31 21:37:08,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 388. [2022-01-31 21:37:08,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:08,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:08,906 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:08,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:08,906 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:08,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 43 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:08,907 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:08,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:08,907 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:08,907 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:08,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable181 [2022-01-31 21:37:08,907 INFO L402 AbstractCegarLoop]: === Iteration 183 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:08,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:08,907 INFO L85 PathProgramCache]: Analyzing trace with hash -97925315, now seen corresponding path program 167 times [2022-01-31 21:37:08,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:08,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346097970] [2022-01-31 21:37:08,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:08,948 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:08,976 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:08,977 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:09,006 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:09,042 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:09,042 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:09,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:09,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:09,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:09,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:09,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:09,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:09,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:10,360 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:10,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346097970] [2022-01-31 21:37:10,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [346097970] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:10,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:10,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:37:10,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978143566] [2022-01-31 21:37:10,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:10,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:37:10,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:10,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:37:10,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=2038, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:37:10,361 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:12,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:12,430 INFO L93 Difference]: Finished difference Result 665 states and 775 transitions. [2022-01-31 21:37:12,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:37:12,430 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:12,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:12,431 INFO L225 Difference]: With dead ends: 665 [2022-01-31 21:37:12,431 INFO L226 Difference]: Without dead ends: 425 [2022-01-31 21:37:12,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1027 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=228, Invalid=2222, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:37:12,431 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 3762 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 3772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:12,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 112 Invalid, 3772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3762 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:37:12,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-01-31 21:37:13,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 388. [2022-01-31 21:37:13,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:13,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:13,150 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:13,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:13,150 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:13,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 44 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:13,150 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:13,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:13,151 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:13,151 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:13,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2022-01-31 21:37:13,151 INFO L402 AbstractCegarLoop]: === Iteration 184 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:13,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:13,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1903363649, now seen corresponding path program 168 times [2022-01-31 21:37:13,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:13,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912781235] [2022-01-31 21:37:13,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:13,180 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:13,230 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:13,230 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:13,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:13,299 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:13,299 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:13,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:13,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:13,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:13,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:13,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:13,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:13,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:14,707 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:14,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912781235] [2022-01-31 21:37:14,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [912781235] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:14,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:14,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:37:14,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651753858] [2022-01-31 21:37:14,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:14,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:37:14,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:14,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:37:14,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=2127, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:37:14,708 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:16,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:16,529 INFO L93 Difference]: Finished difference Result 662 states and 772 transitions. [2022-01-31 21:37:16,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:37:16,530 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:16,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:16,530 INFO L225 Difference]: With dead ends: 662 [2022-01-31 21:37:16,530 INFO L226 Difference]: Without dead ends: 422 [2022-01-31 21:37:16,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=235, Invalid=2315, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:37:16,531 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 3198 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 3208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:16,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 80 Invalid, 3208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3198 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:37:16,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2022-01-31 21:37:17,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 388. [2022-01-31 21:37:17,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:17,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:17,294 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:17,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:17,294 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:17,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.553191489361702) internal successors, (73), 45 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:17,295 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:17,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:17,295 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:17,295 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:17,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable183 [2022-01-31 21:37:17,295 INFO L402 AbstractCegarLoop]: === Iteration 185 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:17,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:17,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1573955197, now seen corresponding path program 169 times [2022-01-31 21:37:17,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:17,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191230278] [2022-01-31 21:37:17,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:17,337 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,379 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,379 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:17,413 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,454 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,454 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:17,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:17,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:17,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:17,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:17,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:17,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:17,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:18,999 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:18,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191230278] [2022-01-31 21:37:18,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1191230278] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:18,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:18,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:37:19,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142926203] [2022-01-31 21:37:19,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:19,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:37:19,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:19,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:37:19,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2218, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:37:19,000 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:20,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:20,733 INFO L93 Difference]: Finished difference Result 659 states and 769 transitions. [2022-01-31 21:37:20,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:37:20,733 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:20,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:20,733 INFO L225 Difference]: With dead ends: 659 [2022-01-31 21:37:20,733 INFO L226 Difference]: Without dead ends: 419 [2022-01-31 21:37:20,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=242, Invalid=2410, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:37:20,734 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 3110 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 3120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:20,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 76 Invalid, 3120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3110 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:37:20,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2022-01-31 21:37:21,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 388. [2022-01-31 21:37:21,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:21,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:21,456 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:21,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:21,456 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:21,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5208333333333333) internal successors, (73), 46 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:21,457 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:21,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:21,457 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:21,457 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:21,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184 [2022-01-31 21:37:21,457 INFO L402 AbstractCegarLoop]: === Iteration 186 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:21,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:21,457 INFO L85 PathProgramCache]: Analyzing trace with hash -14392705, now seen corresponding path program 170 times [2022-01-31 21:37:21,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:21,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385898582] [2022-01-31 21:37:21,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:21,487 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:21,523 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:21,523 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:21,552 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:21,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:21,579 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:21,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:21,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:21,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:21,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:21,728 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:21,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:21,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:23,070 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:23,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385898582] [2022-01-31 21:37:23,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [385898582] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:23,070 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:23,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:37:23,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000343969] [2022-01-31 21:37:23,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:23,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:37:23,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:23,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:37:23,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=2311, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:37:23,071 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:25,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:25,037 INFO L93 Difference]: Finished difference Result 657 states and 767 transitions. [2022-01-31 21:37:25,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:37:25,037 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:25,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:25,038 INFO L225 Difference]: With dead ends: 657 [2022-01-31 21:37:25,038 INFO L226 Difference]: Without dead ends: 417 [2022-01-31 21:37:25,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 19 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=249, Invalid=2507, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:37:25,039 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 3470 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 3481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:25,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 91 Invalid, 3481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3470 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:37:25,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2022-01-31 21:37:25,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 388. [2022-01-31 21:37:25,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 373 states have (on average 1.1689008042895441) internal successors, (436), 376 states have internal predecessors, (436), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:25,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 453 transitions. [2022-01-31 21:37:25,810 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 453 transitions. Word has length 79 [2022-01-31 21:37:25,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:25,810 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 453 transitions. [2022-01-31 21:37:25,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.489795918367347) internal successors, (73), 47 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:25,810 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 453 transitions. [2022-01-31 21:37:25,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:37:25,810 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:25,810 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:25,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2022-01-31 21:37:25,810 INFO L402 AbstractCegarLoop]: === Iteration 187 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:25,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:25,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1025509955, now seen corresponding path program 171 times [2022-01-31 21:37:25,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:25,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744378854] [2022-01-31 21:37:25,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:25,846 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:25,846 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:37:25,874 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:25,908 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:25,908 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:25,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:26,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:26,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:26,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:27,318 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:27,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744378854] [2022-01-31 21:37:27,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1744378854] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:27,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:27,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:37:27,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154809742] [2022-01-31 21:37:27,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:27,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:37:27,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:27,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:37:27,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=2406, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:37:27,319 INFO L87 Difference]: Start difference. First operand 388 states and 453 transitions. Second operand has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:29,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:29,364 INFO L93 Difference]: Finished difference Result 668 states and 782 transitions. [2022-01-31 21:37:29,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:37:29,364 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-01-31 21:37:29,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:29,365 INFO L225 Difference]: With dead ends: 668 [2022-01-31 21:37:29,365 INFO L226 Difference]: Without dead ends: 417 [2022-01-31 21:37:29,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=256, Invalid=2606, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:37:29,365 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 79 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 3743 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 3754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:29,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 91 Invalid, 3754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3743 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:37:29,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2022-01-31 21:37:30,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 391. [2022-01-31 21:37:30,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 376 states have (on average 1.1702127659574468) internal successors, (440), 379 states have internal predecessors, (440), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:30,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 457 transitions. [2022-01-31 21:37:30,096 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 457 transitions. Word has length 79 [2022-01-31 21:37:30,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:30,096 INFO L470 AbstractCegarLoop]: Abstraction has 391 states and 457 transitions. [2022-01-31 21:37:30,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.46) internal successors, (73), 48 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:30,097 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 457 transitions. [2022-01-31 21:37:30,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-01-31 21:37:30,097 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:30,097 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:30,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable186 [2022-01-31 21:37:30,097 INFO L402 AbstractCegarLoop]: === Iteration 188 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:30,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:30,097 INFO L85 PathProgramCache]: Analyzing trace with hash -860791901, now seen corresponding path program 8 times [2022-01-31 21:37:30,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:30,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753938401] [2022-01-31 21:37:30,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:30,136 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:30,175 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:30,175 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:30,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:30,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:30,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:30,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:30,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:30,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:30,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:30,469 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:30,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753938401] [2022-01-31 21:37:30,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1753938401] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:30,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:30,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:37:30,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728918676] [2022-01-31 21:37:30,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:30,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:37:30,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:30,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:37:30,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=362, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:37:30,470 INFO L87 Difference]: Start difference. First operand 391 states and 457 transitions. Second operand has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:37:31,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:31,635 INFO L93 Difference]: Finished difference Result 707 states and 831 transitions. [2022-01-31 21:37:31,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:37:31,635 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 81 [2022-01-31 21:37:31,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:31,635 INFO L225 Difference]: With dead ends: 707 [2022-01-31 21:37:31,635 INFO L226 Difference]: Without dead ends: 458 [2022-01-31 21:37:31,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 24 SyntacticMatches, 16 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=296, Invalid=696, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:37:31,636 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 104 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:31,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 37 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:37:31,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2022-01-31 21:37:32,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 418. [2022-01-31 21:37:32,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 403 states have (on average 1.1662531017369726) internal successors, (470), 406 states have internal predecessors, (470), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:32,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 487 transitions. [2022-01-31 21:37:32,383 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 487 transitions. Word has length 81 [2022-01-31 21:37:32,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:32,383 INFO L470 AbstractCegarLoop]: Abstraction has 418 states and 487 transitions. [2022-01-31 21:37:32,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 22 states have internal predecessors, (68), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:37:32,383 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 487 transitions. [2022-01-31 21:37:32,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:37:32,383 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:32,383 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:32,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable187 [2022-01-31 21:37:32,384 INFO L402 AbstractCegarLoop]: === Iteration 189 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:32,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:32,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1888113636, now seen corresponding path program 172 times [2022-01-31 21:37:32,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:32,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058909602] [2022-01-31 21:37:32,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:32,425 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,453 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,453 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:32,492 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,529 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,530 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:32,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:32,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:32,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:32,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:32,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:32,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:32,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:33,695 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:33,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058909602] [2022-01-31 21:37:33,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2058909602] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:33,696 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:33,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:37:33,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115536400] [2022-01-31 21:37:33,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:33,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:37:33,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:33,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:37:33,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1129, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:37:33,697 INFO L87 Difference]: Start difference. First operand 418 states and 487 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:36,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:36,240 INFO L93 Difference]: Finished difference Result 767 states and 886 transitions. [2022-01-31 21:37:36,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:37:36,240 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:37:36,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:36,241 INFO L225 Difference]: With dead ends: 767 [2022-01-31 21:37:36,241 INFO L226 Difference]: Without dead ends: 500 [2022-01-31 21:37:36,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 6 SyntacticMatches, 38 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=146, Invalid=1336, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:37:36,241 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2537 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 2550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:36,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 78 Invalid, 2550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2537 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:37:36,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2022-01-31 21:37:37,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 474. [2022-01-31 21:37:37,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 459 states have (on average 1.1481481481481481) internal successors, (527), 462 states have internal predecessors, (527), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 544 transitions. [2022-01-31 21:37:37,841 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 544 transitions. Word has length 82 [2022-01-31 21:37:37,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:37,841 INFO L470 AbstractCegarLoop]: Abstraction has 474 states and 544 transitions. [2022-01-31 21:37:37,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 32 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:37,842 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 544 transitions. [2022-01-31 21:37:37,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:37:37,842 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:37,842 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:37,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2022-01-31 21:37:37,842 INFO L402 AbstractCegarLoop]: === Iteration 190 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:37,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:37,842 INFO L85 PathProgramCache]: Analyzing trace with hash 720673822, now seen corresponding path program 173 times [2022-01-31 21:37:37,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:37,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098015975] [2022-01-31 21:37:37,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:37,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:37,919 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:37,920 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:37,952 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:37,992 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:37,992 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:37,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:37,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:38,086 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:38,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:38,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:38,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:38,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:39,240 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:39,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098015975] [2022-01-31 21:37:39,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1098015975] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:39,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:39,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:37:39,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139572081] [2022-01-31 21:37:39,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:39,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:37:39,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:39,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:37:39,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1194, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:37:39,241 INFO L87 Difference]: Start difference. First operand 474 states and 544 transitions. Second operand has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:42,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:42,307 INFO L93 Difference]: Finished difference Result 818 states and 936 transitions. [2022-01-31 21:37:42,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:37:42,307 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:37:42,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:42,308 INFO L225 Difference]: With dead ends: 818 [2022-01-31 21:37:42,308 INFO L226 Difference]: Without dead ends: 551 [2022-01-31 21:37:42,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=148, Invalid=1334, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:37:42,309 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 2555 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 2566 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:42,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 75 Invalid, 2566 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2555 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:37:42,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-01-31 21:37:43,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 477. [2022-01-31 21:37:43,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:43,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:37:43,821 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:37:43,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:43,821 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:37:43,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1714285714285713) internal successors, (76), 33 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:43,821 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:37:43,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:37:43,822 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:43,822 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:43,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2022-01-31 21:37:43,822 INFO L402 AbstractCegarLoop]: === Iteration 191 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:43,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:43,822 INFO L85 PathProgramCache]: Analyzing trace with hash 1399946076, now seen corresponding path program 174 times [2022-01-31 21:37:43,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:43,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28258333] [2022-01-31 21:37:43,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:43,854 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:43,895 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:43,896 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:43,938 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:43,977 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:43,977 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:43,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:43,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:44,099 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:44,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:44,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:44,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:45,381 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:45,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28258333] [2022-01-31 21:37:45,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [28258333] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:45,381 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:45,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:37:45,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921962489] [2022-01-31 21:37:45,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:45,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:37:45,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:45,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:37:45,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:37:45,382 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:48,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:48,335 INFO L93 Difference]: Finished difference Result 821 states and 939 transitions. [2022-01-31 21:37:48,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:37:48,335 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:37:48,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:48,335 INFO L225 Difference]: With dead ends: 821 [2022-01-31 21:37:48,336 INFO L226 Difference]: Without dead ends: 554 [2022-01-31 21:37:48,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 36 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:37:48,336 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2194 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 2204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:48,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 56 Invalid, 2204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2194 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:37:48,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2022-01-31 21:37:49,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 477. [2022-01-31 21:37:49,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:49,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:37:49,853 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:37:49,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:49,853 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:37:49,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 34 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:49,854 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:37:49,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:37:49,854 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:49,854 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:49,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable190 [2022-01-31 21:37:49,856 INFO L402 AbstractCegarLoop]: === Iteration 192 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:49,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:49,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1960645854, now seen corresponding path program 175 times [2022-01-31 21:37:49,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:49,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665122585] [2022-01-31 21:37:49,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:49,891 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:49,925 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:49,925 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:49,963 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:49,989 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:49,989 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:49,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:49,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:50,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:50,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:50,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:50,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:50,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:51,235 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:51,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665122585] [2022-01-31 21:37:51,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [665122585] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:51,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:51,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:37:51,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435010107] [2022-01-31 21:37:51,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:51,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:37:51,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:51,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:37:51,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1330, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:37:51,240 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:54,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:54,379 INFO L93 Difference]: Finished difference Result 818 states and 936 transitions. [2022-01-31 21:37:54,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:37:54,380 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:37:54,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:54,380 INFO L225 Difference]: With dead ends: 818 [2022-01-31 21:37:54,380 INFO L226 Difference]: Without dead ends: 551 [2022-01-31 21:37:54,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=162, Invalid=1478, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:37:54,381 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 51 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 2410 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 2420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:54,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 72 Invalid, 2420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2410 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:37:54,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-01-31 21:37:55,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 477. [2022-01-31 21:37:55,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:37:55,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:37:55,970 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:37:55,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:55,970 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:37:55,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 35 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:37:55,970 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:37:55,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:37:55,971 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:55,971 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:55,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191 [2022-01-31 21:37:55,971 INFO L402 AbstractCegarLoop]: === Iteration 193 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:55,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:55,971 INFO L85 PathProgramCache]: Analyzing trace with hash 2001320604, now seen corresponding path program 176 times [2022-01-31 21:37:55,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:55,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1188975345] [2022-01-31 21:37:55,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:56,020 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:56,056 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:56,056 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:56,087 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:56,116 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:56,116 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:56,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:56,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:56,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:56,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:56,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:37:56,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:56,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:57,400 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:57,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1188975345] [2022-01-31 21:37:57,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1188975345] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:57,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:57,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:37:57,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994861152] [2022-01-31 21:37:57,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:57,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:37:57,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:57,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:37:57,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1401, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:37:57,401 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:00,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:00,721 INFO L93 Difference]: Finished difference Result 815 states and 933 transitions. [2022-01-31 21:38:00,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:38:00,721 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:00,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:00,722 INFO L225 Difference]: With dead ends: 815 [2022-01-31 21:38:00,722 INFO L226 Difference]: Without dead ends: 548 [2022-01-31 21:38:00,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=169, Invalid=1553, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:38:00,723 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 2885 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:00,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 98 Invalid, 2895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2885 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:00,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2022-01-31 21:38:02,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 477. [2022-01-31 21:38:02,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:02,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:02,306 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:02,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:02,306 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:02,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 36 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:02,306 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:02,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:02,306 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:02,306 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:02,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192 [2022-01-31 21:38:02,306 INFO L402 AbstractCegarLoop]: === Iteration 194 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:02,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:02,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1849746018, now seen corresponding path program 177 times [2022-01-31 21:38:02,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:02,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570320720] [2022-01-31 21:38:02,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:02,336 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:02,372 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:02,372 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:02,400 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:02,437 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:02,437 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:02,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:02,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:02,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:02,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:02,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:02,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:03,770 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:03,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570320720] [2022-01-31 21:38:03,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1570320720] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:03,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:03,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:38:03,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821883200] [2022-01-31 21:38:03,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:03,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:38:03,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:03,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:38:03,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1474, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:38:03,772 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:06,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:06,954 INFO L93 Difference]: Finished difference Result 812 states and 930 transitions. [2022-01-31 21:38:06,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:38:06,955 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:06,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:06,955 INFO L225 Difference]: With dead ends: 812 [2022-01-31 21:38:06,955 INFO L226 Difference]: Without dead ends: 545 [2022-01-31 21:38:06,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=176, Invalid=1630, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:38:06,956 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 2942 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 2953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:06,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 93 Invalid, 2953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2942 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:38:06,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2022-01-31 21:38:08,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 477. [2022-01-31 21:38:08,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:08,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:08,497 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:08,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:08,497 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:08,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.9487179487179487) internal successors, (76), 37 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:08,497 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:08,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:08,498 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:08,498 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:08,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable193 [2022-01-31 21:38:08,498 INFO L402 AbstractCegarLoop]: === Iteration 195 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:08,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:08,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1964141020, now seen corresponding path program 178 times [2022-01-31 21:38:08,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:08,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409052287] [2022-01-31 21:38:08,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:08,531 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:08,575 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:08,575 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:08,609 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:08,650 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:08,650 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:08,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:08,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:08,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:08,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:08,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:08,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:08,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:10,144 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:10,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409052287] [2022-01-31 21:38:10,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [409052287] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:10,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:10,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:38:10,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776167208] [2022-01-31 21:38:10,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:10,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:38:10,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:10,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:38:10,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1549, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:38:10,146 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:13,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:13,379 INFO L93 Difference]: Finished difference Result 809 states and 927 transitions. [2022-01-31 21:38:13,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:38:13,379 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:13,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:13,380 INFO L225 Difference]: With dead ends: 809 [2022-01-31 21:38:13,380 INFO L226 Difference]: Without dead ends: 542 [2022-01-31 21:38:13,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=183, Invalid=1709, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:38:13,380 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 63 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 3155 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 3166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:13,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 87 Invalid, 3166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3155 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:13,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-01-31 21:38:15,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 477. [2022-01-31 21:38:15,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:15,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:15,115 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:15,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:15,115 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:15,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 38 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:15,115 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:15,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:15,116 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:15,116 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:15,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2022-01-31 21:38:15,116 INFO L402 AbstractCegarLoop]: === Iteration 196 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:15,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:15,116 INFO L85 PathProgramCache]: Analyzing trace with hash 1611052638, now seen corresponding path program 179 times [2022-01-31 21:38:15,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:15,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369104942] [2022-01-31 21:38:15,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:15,163 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:15,207 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:15,207 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:15,246 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:15,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:15,274 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:15,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:15,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:15,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:15,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:15,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:15,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:16,635 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:16,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369104942] [2022-01-31 21:38:16,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1369104942] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:16,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:16,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:38:16,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168710128] [2022-01-31 21:38:16,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:16,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:38:16,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:16,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:38:16,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:38:16,636 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:19,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:19,819 INFO L93 Difference]: Finished difference Result 806 states and 924 transitions. [2022-01-31 21:38:19,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:38:19,819 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:19,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:19,820 INFO L225 Difference]: With dead ends: 806 [2022-01-31 21:38:19,820 INFO L226 Difference]: Without dead ends: 539 [2022-01-31 21:38:19,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1017 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=190, Invalid=1790, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:38:19,821 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2990 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 3000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:19,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 66 Invalid, 3000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2990 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:19,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2022-01-31 21:38:21,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 477. [2022-01-31 21:38:21,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:21,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:21,413 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:21,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:21,414 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:21,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.853658536585366) internal successors, (76), 39 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:21,414 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:21,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:21,414 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:21,414 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:21,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable195 [2022-01-31 21:38:21,414 INFO L402 AbstractCegarLoop]: === Iteration 197 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:21,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:21,414 INFO L85 PathProgramCache]: Analyzing trace with hash -438335204, now seen corresponding path program 180 times [2022-01-31 21:38:21,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:21,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [985304193] [2022-01-31 21:38:21,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:21,449 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:21,476 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:21,477 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:21,516 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:21,551 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:21,551 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:21,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:21,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:21,645 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:21,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:21,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:21,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:21,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:22,918 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:22,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [985304193] [2022-01-31 21:38:22,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [985304193] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:22,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:22,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:38:22,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653258616] [2022-01-31 21:38:22,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:22,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:38:22,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:22,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:38:22,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1705, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:38:22,919 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:26,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:26,174 INFO L93 Difference]: Finished difference Result 803 states and 921 transitions. [2022-01-31 21:38:26,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:38:26,174 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:26,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:26,175 INFO L225 Difference]: With dead ends: 803 [2022-01-31 21:38:26,175 INFO L226 Difference]: Without dead ends: 536 [2022-01-31 21:38:26,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=197, Invalid=1873, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:38:26,175 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2877 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2877 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:26,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 66 Invalid, 2887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2877 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:26,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2022-01-31 21:38:27,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 477. [2022-01-31 21:38:27,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:27,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:27,849 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:27,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:27,850 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:27,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.8095238095238095) internal successors, (76), 40 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:27,850 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:27,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:27,850 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:27,850 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:27,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable196 [2022-01-31 21:38:27,850 INFO L402 AbstractCegarLoop]: === Iteration 198 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:27,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:27,851 INFO L85 PathProgramCache]: Analyzing trace with hash -14688482, now seen corresponding path program 181 times [2022-01-31 21:38:27,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:27,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604001060] [2022-01-31 21:38:27,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:27,884 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:27,920 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:27,920 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:27,947 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:27,981 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:27,982 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:27,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:27,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:28,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:28,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:28,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:28,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:28,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:29,325 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:29,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604001060] [2022-01-31 21:38:29,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [604001060] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:29,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:29,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:38:29,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407195707] [2022-01-31 21:38:29,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:29,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:38:29,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:29,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:38:29,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1786, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:38:29,327 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:32,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:32,412 INFO L93 Difference]: Finished difference Result 800 states and 918 transitions. [2022-01-31 21:38:32,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:38:32,412 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:32,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:32,412 INFO L225 Difference]: With dead ends: 800 [2022-01-31 21:38:32,412 INFO L226 Difference]: Without dead ends: 533 [2022-01-31 21:38:32,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1090 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=204, Invalid=1958, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:38:32,413 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2797 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 2807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:32,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 56 Invalid, 2807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2797 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:32,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-01-31 21:38:34,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 477. [2022-01-31 21:38:34,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:34,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:34,034 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:34,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:34,035 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:34,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 41 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:34,035 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:34,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:34,035 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:34,035 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:34,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable197 [2022-01-31 21:38:34,035 INFO L402 AbstractCegarLoop]: === Iteration 199 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:34,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:34,035 INFO L85 PathProgramCache]: Analyzing trace with hash -1044047780, now seen corresponding path program 182 times [2022-01-31 21:38:34,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:34,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525469546] [2022-01-31 21:38:34,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:34,074 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:34,110 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:34,110 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:34,141 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:34,173 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:34,174 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:34,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:34,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:34,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:34,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:34,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:34,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:34,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:35,522 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:35,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525469546] [2022-01-31 21:38:35,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1525469546] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:35,522 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:35,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:38:35,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436871607] [2022-01-31 21:38:35,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:35,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:38:35,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:35,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:38:35,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1869, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:38:35,523 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:38,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:38,813 INFO L93 Difference]: Finished difference Result 797 states and 915 transitions. [2022-01-31 21:38:38,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:38:38,813 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:38,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:38,814 INFO L225 Difference]: With dead ends: 797 [2022-01-31 21:38:38,814 INFO L226 Difference]: Without dead ends: 530 [2022-01-31 21:38:38,815 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=211, Invalid=2045, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:38:38,815 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 3465 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 3475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:38,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 104 Invalid, 3475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3465 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:38:38,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2022-01-31 21:38:40,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 477. [2022-01-31 21:38:40,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:40,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:40,439 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:40,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:40,440 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:40,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7272727272727273) internal successors, (76), 42 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:40,440 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:40,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:40,440 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:40,440 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:40,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198 [2022-01-31 21:38:40,440 INFO L402 AbstractCegarLoop]: === Iteration 200 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:40,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:40,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1888053282, now seen corresponding path program 183 times [2022-01-31 21:38:40,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:40,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114495917] [2022-01-31 21:38:40,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:40,487 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:40,530 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:40,531 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:40,564 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:40,606 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:40,606 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:40,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:40,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:40,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:40,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:40,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:40,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:40,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:41,907 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:41,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114495917] [2022-01-31 21:38:41,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2114495917] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:41,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:41,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:38:41,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932031556] [2022-01-31 21:38:41,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:41,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:38:41,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:41,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:38:41,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1954, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:38:41,908 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:44,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:44,897 INFO L93 Difference]: Finished difference Result 794 states and 912 transitions. [2022-01-31 21:38:44,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:38:44,897 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:44,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:44,898 INFO L225 Difference]: With dead ends: 794 [2022-01-31 21:38:44,898 INFO L226 Difference]: Without dead ends: 527 [2022-01-31 21:38:44,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=218, Invalid=2134, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:38:44,898 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 3465 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 3476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:44,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 79 Invalid, 3476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3465 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:44,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2022-01-31 21:38:46,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 477. [2022-01-31 21:38:46,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:46,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:46,544 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:46,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:46,544 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:46,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.6888888888888889) internal successors, (76), 43 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:46,544 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:46,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:46,544 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:46,544 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 13, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:46,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199 [2022-01-31 21:38:46,545 INFO L402 AbstractCegarLoop]: === Iteration 201 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:46,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:46,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1613293668, now seen corresponding path program 184 times [2022-01-31 21:38:46,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:46,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105226824] [2022-01-31 21:38:46,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:46,591 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:46,639 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:46,639 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:46,675 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:46,717 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:46,717 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:46,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:46,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:46,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:46,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:46,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:46,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:46,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:48,284 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:48,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105226824] [2022-01-31 21:38:48,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1105226824] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:48,285 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:48,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:38:48,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911959162] [2022-01-31 21:38:48,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:48,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:38:48,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:48,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:38:48,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=2041, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:38:48,286 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:51,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:51,567 INFO L93 Difference]: Finished difference Result 791 states and 909 transitions. [2022-01-31 21:38:51,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:38:51,568 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:51,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:51,568 INFO L225 Difference]: With dead ends: 791 [2022-01-31 21:38:51,568 INFO L226 Difference]: Without dead ends: 524 [2022-01-31 21:38:51,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=225, Invalid=2225, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:38:51,569 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 3572 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 3582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:51,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 86 Invalid, 3582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3572 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:38:51,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2022-01-31 21:38:53,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 477. [2022-01-31 21:38:53,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:53,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:53,279 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:53,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:53,279 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:53,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 44 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:53,279 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:53,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:53,279 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:53,279 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:53,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable200 [2022-01-31 21:38:53,279 INFO L402 AbstractCegarLoop]: === Iteration 202 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:53,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:53,280 INFO L85 PathProgramCache]: Analyzing trace with hash -227090274, now seen corresponding path program 185 times [2022-01-31 21:38:53,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:53,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118254668] [2022-01-31 21:38:53,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:53,325 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:53,359 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:53,359 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:53,392 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:53,437 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:53,437 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:53,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:53,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:53,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:53,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:53,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:53,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:53,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:54,640 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:54,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118254668] [2022-01-31 21:38:54,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2118254668] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:54,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:54,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:38:54,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229556625] [2022-01-31 21:38:54,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:54,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:38:54,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:54,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:38:54,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=2130, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:38:54,641 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:57,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:57,614 INFO L93 Difference]: Finished difference Result 788 states and 906 transitions. [2022-01-31 21:38:57,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:38:57,615 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:38:57,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:57,615 INFO L225 Difference]: With dead ends: 788 [2022-01-31 21:38:57,615 INFO L226 Difference]: Without dead ends: 521 [2022-01-31 21:38:57,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=232, Invalid=2318, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:38:57,616 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 3563 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 3573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:57,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 96 Invalid, 3573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3563 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:38:57,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2022-01-31 21:38:59,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 477. [2022-01-31 21:38:59,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:38:59,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:38:59,245 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:38:59,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:59,245 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:38:59,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.6170212765957446) internal successors, (76), 45 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:38:59,245 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:38:59,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:38:59,246 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:59,246 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:59,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable201 [2022-01-31 21:38:59,246 INFO L402 AbstractCegarLoop]: === Iteration 203 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:59,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:59,246 INFO L85 PathProgramCache]: Analyzing trace with hash -165050660, now seen corresponding path program 186 times [2022-01-31 21:38:59,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:59,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596507572] [2022-01-31 21:38:59,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:59,275 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:59,310 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:59,310 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:59,347 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:59,382 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:59,382 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:59,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:59,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:59,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:59,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:59,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:38:59,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:59,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:00,927 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:00,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596507572] [2022-01-31 21:39:00,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [596507572] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:00,928 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:00,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:39:00,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562643957] [2022-01-31 21:39:00,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:00,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:39:00,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:00,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:39:00,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=2221, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:39:00,929 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:04,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:04,058 INFO L93 Difference]: Finished difference Result 785 states and 903 transitions. [2022-01-31 21:39:04,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:39:04,058 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:39:04,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:04,058 INFO L225 Difference]: With dead ends: 785 [2022-01-31 21:39:04,058 INFO L226 Difference]: Without dead ends: 518 [2022-01-31 21:39:04,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1115 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=239, Invalid=2413, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:39:04,059 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 3716 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 3726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:04,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 106 Invalid, 3726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3716 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:39:04,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2022-01-31 21:39:05,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 477. [2022-01-31 21:39:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:05,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:39:05,701 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:39:05,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:05,701 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:39:05,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 46 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:05,701 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:39:05,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:39:05,701 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:05,701 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:05,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable202 [2022-01-31 21:39:05,702 INFO L402 AbstractCegarLoop]: === Iteration 204 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:05,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:05,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1970488994, now seen corresponding path program 187 times [2022-01-31 21:39:05,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:05,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841309695] [2022-01-31 21:39:05,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:05,748 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:05,791 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:05,791 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:05,836 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:05,878 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:05,878 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:05,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:05,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:05,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:05,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:05,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:05,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:05,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:07,508 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:07,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841309695] [2022-01-31 21:39:07,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1841309695] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:07,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:07,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:39:07,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505982607] [2022-01-31 21:39:07,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:07,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:39:07,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:07,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:39:07,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2314, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:39:07,510 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:10,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:10,784 INFO L93 Difference]: Finished difference Result 782 states and 900 transitions. [2022-01-31 21:39:10,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:39:10,785 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:39:10,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:10,785 INFO L225 Difference]: With dead ends: 782 [2022-01-31 21:39:10,785 INFO L226 Difference]: Without dead ends: 515 [2022-01-31 21:39:10,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=246, Invalid=2510, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:39:10,786 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 3825 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 3836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:10,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 107 Invalid, 3836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3825 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:39:10,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-01-31 21:39:12,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 477. [2022-01-31 21:39:12,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:12,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:39:12,436 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:39:12,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:12,436 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:39:12,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 47 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:12,436 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:39:12,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:39:12,436 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:12,436 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 17, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:12,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203 [2022-01-31 21:39:12,437 INFO L402 AbstractCegarLoop]: === Iteration 205 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:12,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:12,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1506829852, now seen corresponding path program 188 times [2022-01-31 21:39:12,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:12,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868815755] [2022-01-31 21:39:12,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:12,482 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:12,526 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:12,526 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:12,559 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:12,599 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:12,599 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:12,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:12,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:12,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:12,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:12,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:12,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:12,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:14,242 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:14,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868815755] [2022-01-31 21:39:14,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [868815755] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:14,243 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:14,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:39:14,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619116051] [2022-01-31 21:39:14,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:14,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:39:14,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:14,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:39:14,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=2409, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:39:14,244 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:17,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:17,262 INFO L93 Difference]: Finished difference Result 779 states and 897 transitions. [2022-01-31 21:39:17,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:39:17,263 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:39:17,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:17,263 INFO L225 Difference]: With dead ends: 779 [2022-01-31 21:39:17,263 INFO L226 Difference]: Without dead ends: 512 [2022-01-31 21:39:17,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1062 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=253, Invalid=2609, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:39:17,264 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 70 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 3669 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 3679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:17,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 88 Invalid, 3679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3669 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:39:17,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2022-01-31 21:39:18,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 477. [2022-01-31 21:39:18,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:18,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:39:18,895 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:39:18,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:18,895 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:39:18,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.52) internal successors, (76), 48 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:18,895 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:39:18,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:39:18,896 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:18,896 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:18,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable204 [2022-01-31 21:39:18,896 INFO L402 AbstractCegarLoop]: === Iteration 206 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:18,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:18,896 INFO L85 PathProgramCache]: Analyzing trace with hash -81518050, now seen corresponding path program 189 times [2022-01-31 21:39:18,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:18,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471413072] [2022-01-31 21:39:18,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:18,938 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:18,973 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:18,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:19,001 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:19,034 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:19,034 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:19,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:19,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:19,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:19,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:19,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:19,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:19,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:20,494 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:20,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471413072] [2022-01-31 21:39:20,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [471413072] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:20,495 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:20,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:39:20,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593188445] [2022-01-31 21:39:20,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:20,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:39:20,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:20,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:39:20,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=2506, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:39:20,496 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:23,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:23,520 INFO L93 Difference]: Finished difference Result 777 states and 895 transitions. [2022-01-31 21:39:23,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:39:23,520 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:39:23,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:23,521 INFO L225 Difference]: With dead ends: 777 [2022-01-31 21:39:23,521 INFO L226 Difference]: Without dead ends: 510 [2022-01-31 21:39:23,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1022 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=260, Invalid=2710, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:39:23,521 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 75 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 3662 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 3672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:23,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 84 Invalid, 3672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3662 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:39:23,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2022-01-31 21:39:25,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 477. [2022-01-31 21:39:25,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 462 states have (on average 1.147186147186147) internal successors, (530), 465 states have internal predecessors, (530), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:25,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 547 transitions. [2022-01-31 21:39:25,148 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 547 transitions. Word has length 82 [2022-01-31 21:39:25,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:25,148 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 547 transitions. [2022-01-31 21:39:25,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.4901960784313726) internal successors, (76), 49 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:25,148 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 547 transitions. [2022-01-31 21:39:25,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:39:25,149 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:25,149 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:25,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205 [2022-01-31 21:39:25,149 INFO L402 AbstractCegarLoop]: === Iteration 207 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:25,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:25,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1092635300, now seen corresponding path program 190 times [2022-01-31 21:39:25,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:25,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688687221] [2022-01-31 21:39:25,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:25,191 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:25,191 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:39:25,227 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:25,269 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:25,270 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:25,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:25,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:25,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:25,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:25,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:25,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:25,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:26,957 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:26,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688687221] [2022-01-31 21:39:26,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1688687221] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:26,957 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:26,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:39:26,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82856372] [2022-01-31 21:39:26,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:26,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:39:26,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:26,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:39:26,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2605, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:39:26,958 INFO L87 Difference]: Start difference. First operand 477 states and 547 transitions. Second operand has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:30,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:30,005 INFO L93 Difference]: Finished difference Result 788 states and 910 transitions. [2022-01-31 21:39:30,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:39:30,006 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 82 [2022-01-31 21:39:30,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:30,006 INFO L225 Difference]: With dead ends: 788 [2022-01-31 21:39:30,006 INFO L226 Difference]: Without dead ends: 510 [2022-01-31 21:39:30,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=267, Invalid=2813, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:39:30,007 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 79 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 4035 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 4047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 4035 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:30,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 92 Invalid, 4047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 4035 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:39:30,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2022-01-31 21:39:31,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 480. [2022-01-31 21:39:31,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 465 states have (on average 1.1483870967741936) internal successors, (534), 468 states have internal predecessors, (534), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:31,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 551 transitions. [2022-01-31 21:39:31,630 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 551 transitions. Word has length 82 [2022-01-31 21:39:31,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:31,631 INFO L470 AbstractCegarLoop]: Abstraction has 480 states and 551 transitions. [2022-01-31 21:39:31,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 50 states have internal predecessors, (76), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:31,631 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 551 transitions. [2022-01-31 21:39:31,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:39:31,631 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:31,631 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:31,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable206 [2022-01-31 21:39:31,631 INFO L402 AbstractCegarLoop]: === Iteration 208 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:31,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:31,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1927793379, now seen corresponding path program 1 times [2022-01-31 21:39:31,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:31,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692835322] [2022-01-31 21:39:31,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:31,661 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:31,698 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:31,699 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:31,727 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:31,762 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:31,762 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:31,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:31,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:31,908 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:31,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:31,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:31,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:31,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:32,931 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:32,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692835322] [2022-01-31 21:39:32,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [692835322] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:32,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:32,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:39:32,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667963074] [2022-01-31 21:39:32,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:32,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:39:32,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:32,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:39:32,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1169, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:39:32,933 INFO L87 Difference]: Start difference. First operand 480 states and 551 transitions. Second operand has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:35,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:35,509 INFO L93 Difference]: Finished difference Result 518 states and 591 transitions. [2022-01-31 21:39:35,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:39:35,509 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:39:35,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:35,510 INFO L225 Difference]: With dead ends: 518 [2022-01-31 21:39:35,510 INFO L226 Difference]: Without dead ends: 516 [2022-01-31 21:39:35,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 8 SyntacticMatches, 39 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=201, Invalid=1605, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:39:35,510 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 50 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 2482 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 2499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:35,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 74 Invalid, 2499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2482 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:39:35,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2022-01-31 21:39:37,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 480. [2022-01-31 21:39:37,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 465 states have (on average 1.1483870967741936) internal successors, (534), 468 states have internal predecessors, (534), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:37,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 551 transitions. [2022-01-31 21:39:37,142 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 551 transitions. Word has length 85 [2022-01-31 21:39:37,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:37,142 INFO L470 AbstractCegarLoop]: Abstraction has 480 states and 551 transitions. [2022-01-31 21:39:37,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.257142857142857) internal successors, (79), 33 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:37,143 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 551 transitions. [2022-01-31 21:39:37,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:39:37,143 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:37,143 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:37,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable207 [2022-01-31 21:39:37,143 INFO L402 AbstractCegarLoop]: === Iteration 209 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:37,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:37,143 INFO L85 PathProgramCache]: Analyzing trace with hash -164506595, now seen corresponding path program 191 times [2022-01-31 21:39:37,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:37,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566914683] [2022-01-31 21:39:37,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:37,202 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,242 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,242 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:37,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,304 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,304 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:37,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:37,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:37,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:37,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:37,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:37,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:37,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:38,494 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:38,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566914683] [2022-01-31 21:39:38,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [566914683] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:38,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:38,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:39:38,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191262109] [2022-01-31 21:39:38,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:38,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:39:38,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:38,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:39:38,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1335, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:39:38,495 INFO L87 Difference]: Start difference. First operand 480 states and 551 transitions. Second operand has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:42,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:42,039 INFO L93 Difference]: Finished difference Result 829 states and 950 transitions. [2022-01-31 21:39:42,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:39:42,039 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:39:42,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:42,040 INFO L225 Difference]: With dead ends: 829 [2022-01-31 21:39:42,040 INFO L226 Difference]: Without dead ends: 562 [2022-01-31 21:39:42,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 6 SyntacticMatches, 38 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=162, Invalid=1560, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:39:42,041 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2809 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 2809 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:42,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 70 Invalid, 2823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 2809 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:39:42,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2022-01-31 21:39:44,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 536. [2022-01-31 21:39:44,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 521 states have (on average 1.1343570057581573) internal successors, (591), 524 states have internal predecessors, (591), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:44,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 608 transitions. [2022-01-31 21:39:44,638 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 608 transitions. Word has length 85 [2022-01-31 21:39:44,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:44,638 INFO L470 AbstractCegarLoop]: Abstraction has 536 states and 608 transitions. [2022-01-31 21:39:44,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 35 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:44,639 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 608 transitions. [2022-01-31 21:39:44,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:39:44,639 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:44,639 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:44,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208 [2022-01-31 21:39:44,639 INFO L402 AbstractCegarLoop]: === Iteration 210 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:44,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:44,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1850686433, now seen corresponding path program 192 times [2022-01-31 21:39:44,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:44,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488848175] [2022-01-31 21:39:44,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:44,685 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:44,720 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:44,720 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:44,749 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:44,783 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:44,783 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:44,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:44,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:44,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:44,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:44,924 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:44,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:44,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:46,342 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:46,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488848175] [2022-01-31 21:39:46,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1488848175] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:46,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:46,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:39:46,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787431001] [2022-01-31 21:39:46,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:46,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:39:46,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:46,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:39:46,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1406, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:39:46,344 INFO L87 Difference]: Start difference. First operand 536 states and 608 transitions. Second operand has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:50,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:50,677 INFO L93 Difference]: Finished difference Result 880 states and 1000 transitions. [2022-01-31 21:39:50,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:39:50,677 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:39:50,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:50,678 INFO L225 Difference]: With dead ends: 880 [2022-01-31 21:39:50,678 INFO L226 Difference]: Without dead ends: 613 [2022-01-31 21:39:50,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:39:50,678 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 49 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 2778 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 2789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:50,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 80 Invalid, 2789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2778 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:39:50,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2022-01-31 21:39:53,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 539. [2022-01-31 21:39:53,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:39:53,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:39:53,337 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:39:53,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:53,338 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:39:53,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0789473684210527) internal successors, (79), 36 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:53,338 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:39:53,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:39:53,338 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:53,338 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:53,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2022-01-31 21:39:53,338 INFO L402 AbstractCegarLoop]: === Iteration 211 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:53,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:53,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1171414179, now seen corresponding path program 193 times [2022-01-31 21:39:53,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:53,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125075684] [2022-01-31 21:39:53,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:53,367 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:53,420 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:53,421 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:53,448 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:53,482 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:53,483 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:53,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:53,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:53,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:53,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:53,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:39:53,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:53,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:54,910 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:54,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125075684] [2022-01-31 21:39:54,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1125075684] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:54,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:54,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:39:54,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886650096] [2022-01-31 21:39:54,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:54,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:39:54,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:54,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:39:54,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1479, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:39:54,912 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:39:59,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:59,324 INFO L93 Difference]: Finished difference Result 883 states and 1003 transitions. [2022-01-31 21:39:59,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:39:59,324 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:39:59,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:59,325 INFO L225 Difference]: With dead ends: 883 [2022-01-31 21:39:59,325 INFO L226 Difference]: Without dead ends: 616 [2022-01-31 21:39:59,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=171, Invalid=1635, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:39:59,326 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 60 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2917 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 2929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:59,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 78 Invalid, 2929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2917 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:39:59,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2022-01-31 21:40:02,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 539. [2022-01-31 21:40:02,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:02,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:02,117 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:02,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:02,118 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:02,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 37 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:02,118 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:02,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:02,118 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:02,118 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:02,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable210 [2022-01-31 21:40:02,118 INFO L402 AbstractCegarLoop]: === Iteration 212 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:02,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:02,119 INFO L85 PathProgramCache]: Analyzing trace with hash -610714401, now seen corresponding path program 194 times [2022-01-31 21:40:02,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:02,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550892594] [2022-01-31 21:40:02,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:02,152 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:02,186 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:02,186 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:02,226 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:02,257 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:02,257 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:02,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:02,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:02,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:02,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:02,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:02,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:02,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:03,658 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:03,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550892594] [2022-01-31 21:40:03,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [550892594] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:03,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:03,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:40:03,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260810414] [2022-01-31 21:40:03,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:03,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:40:03,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:03,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:40:03,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1554, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:40:03,659 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:08,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:08,063 INFO L93 Difference]: Finished difference Result 880 states and 1000 transitions. [2022-01-31 21:40:08,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:40:08,063 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:08,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:08,064 INFO L225 Difference]: With dead ends: 880 [2022-01-31 21:40:08,064 INFO L226 Difference]: Without dead ends: 613 [2022-01-31 21:40:08,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=178, Invalid=1714, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:40:08,065 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 2857 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:08,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 68 Invalid, 2868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2857 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:40:08,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2022-01-31 21:40:10,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 539. [2022-01-31 21:40:10,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:10,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:10,601 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:10,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:10,601 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:10,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:10,601 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:10,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:10,602 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:10,602 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:10,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable211 [2022-01-31 21:40:10,602 INFO L402 AbstractCegarLoop]: === Iteration 213 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:10,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:10,602 INFO L85 PathProgramCache]: Analyzing trace with hash -570039651, now seen corresponding path program 195 times [2022-01-31 21:40:10,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:10,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409273870] [2022-01-31 21:40:10,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:10,649 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:10,683 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:10,684 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:10,718 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:10,760 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:10,760 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:10,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:10,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:10,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:10,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:10,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:10,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:10,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:12,257 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:12,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409273870] [2022-01-31 21:40:12,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [409273870] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:12,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:12,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:40:12,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97190225] [2022-01-31 21:40:12,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:12,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:40:12,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:12,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:40:12,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1631, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:40:12,258 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:16,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:16,509 INFO L93 Difference]: Finished difference Result 877 states and 997 transitions. [2022-01-31 21:40:16,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:40:16,509 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:16,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:16,510 INFO L225 Difference]: With dead ends: 877 [2022-01-31 21:40:16,510 INFO L226 Difference]: Without dead ends: 610 [2022-01-31 21:40:16,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 964 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=185, Invalid=1795, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:40:16,510 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 59 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2755 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 2766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2755 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:16,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 56 Invalid, 2766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2755 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:40:16,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2022-01-31 21:40:19,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 539. [2022-01-31 21:40:19,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:19,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:19,092 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:19,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:19,092 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:19,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 39 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:19,093 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:19,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:19,093 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:19,093 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:19,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable212 [2022-01-31 21:40:19,093 INFO L402 AbstractCegarLoop]: === Iteration 214 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:19,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:19,093 INFO L85 PathProgramCache]: Analyzing trace with hash -126138977, now seen corresponding path program 196 times [2022-01-31 21:40:19,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:19,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354883369] [2022-01-31 21:40:19,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:19,132 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:19,166 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:19,167 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:19,194 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:19,229 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:19,229 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:19,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:19,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:19,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:19,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:19,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:19,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:19,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:20,648 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:20,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354883369] [2022-01-31 21:40:20,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [354883369] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:20,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:20,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:40:20,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83757111] [2022-01-31 21:40:20,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:20,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:40:20,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:20,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:40:20,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1710, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:40:20,649 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:25,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:25,084 INFO L93 Difference]: Finished difference Result 874 states and 994 transitions. [2022-01-31 21:40:25,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:40:25,084 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:25,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:25,085 INFO L225 Difference]: With dead ends: 874 [2022-01-31 21:40:25,085 INFO L226 Difference]: Without dead ends: 607 [2022-01-31 21:40:25,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=192, Invalid=1878, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:40:25,085 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 54 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 3262 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 3273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:25,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 90 Invalid, 3273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3262 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:40:25,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2022-01-31 21:40:27,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 539. [2022-01-31 21:40:27,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:27,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:27,911 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:27,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:27,911 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:27,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.880952380952381) internal successors, (79), 40 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:27,911 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:27,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:27,911 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:27,911 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:27,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable213 [2022-01-31 21:40:27,912 INFO L402 AbstractCegarLoop]: === Iteration 215 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:27,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:27,912 INFO L85 PathProgramCache]: Analyzing trace with hash -607219235, now seen corresponding path program 197 times [2022-01-31 21:40:27,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:27,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518875962] [2022-01-31 21:40:27,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:27,959 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:28,003 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:28,003 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:28,036 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:28,081 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:28,081 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:28,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:28,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:28,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:28,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:28,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:28,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:28,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:29,712 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:29,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518875962] [2022-01-31 21:40:29,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1518875962] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:29,712 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:29,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:40:29,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951790595] [2022-01-31 21:40:29,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:29,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:40:29,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:29,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:40:29,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1791, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:40:29,713 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:34,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:34,444 INFO L93 Difference]: Finished difference Result 871 states and 991 transitions. [2022-01-31 21:40:34,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:40:34,444 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:34,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:34,445 INFO L225 Difference]: With dead ends: 871 [2022-01-31 21:40:34,445 INFO L226 Difference]: Without dead ends: 604 [2022-01-31 21:40:34,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=199, Invalid=1963, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:40:34,445 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 57 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 3039 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 3050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3039 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:34,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 88 Invalid, 3050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3039 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:40:34,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2022-01-31 21:40:37,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 539. [2022-01-31 21:40:37,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:37,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:37,059 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:37,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:37,059 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:37,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.8372093023255813) internal successors, (79), 41 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:37,059 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:37,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:37,060 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:37,060 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:37,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable214 [2022-01-31 21:40:37,060 INFO L402 AbstractCegarLoop]: === Iteration 216 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:37,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:37,060 INFO L85 PathProgramCache]: Analyzing trace with hash -960307617, now seen corresponding path program 198 times [2022-01-31 21:40:37,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:37,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756148369] [2022-01-31 21:40:37,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:37,100 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:37,136 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:37,136 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:37,175 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:37,202 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:37,202 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:37,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:37,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:37,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:37,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:37,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:37,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:38,614 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:38,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756148369] [2022-01-31 21:40:38,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1756148369] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:38,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:38,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:40:38,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098342759] [2022-01-31 21:40:38,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:38,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:40:38,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:38,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:40:38,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1874, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:40:38,615 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:43,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:43,071 INFO L93 Difference]: Finished difference Result 868 states and 988 transitions. [2022-01-31 21:40:43,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:40:43,071 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:43,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:43,072 INFO L225 Difference]: With dead ends: 868 [2022-01-31 21:40:43,072 INFO L226 Difference]: Without dead ends: 601 [2022-01-31 21:40:43,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=206, Invalid=2050, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:40:43,073 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 3707 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 3718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3707 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:43,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 88 Invalid, 3718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3707 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:40:43,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2022-01-31 21:40:45,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 539. [2022-01-31 21:40:45,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:45,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:45,662 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:45,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:45,663 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:45,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7954545454545454) internal successors, (79), 42 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:45,663 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:45,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:45,663 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:45,663 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:45,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215 [2022-01-31 21:40:45,663 INFO L402 AbstractCegarLoop]: === Iteration 217 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:45,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:45,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1285271837, now seen corresponding path program 199 times [2022-01-31 21:40:45,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:45,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250861231] [2022-01-31 21:40:45,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:45,692 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:45,729 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:45,729 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:45,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:45,802 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:45,803 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:45,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:45,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:45,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:45,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:45,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:45,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:46,955 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:46,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250861231] [2022-01-31 21:40:46,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1250861231] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:46,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:46,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:40:46,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493724362] [2022-01-31 21:40:46,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:46,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:40:46,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:46,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:40:46,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1959, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:40:46,956 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:51,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:51,261 INFO L93 Difference]: Finished difference Result 865 states and 985 transitions. [2022-01-31 21:40:51,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:40:51,261 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:40:51,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:51,262 INFO L225 Difference]: With dead ends: 865 [2022-01-31 21:40:51,262 INFO L226 Difference]: Without dead ends: 598 [2022-01-31 21:40:51,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=213, Invalid=2139, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:40:51,263 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 74 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 3359 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 3371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:51,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 80 Invalid, 3371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3359 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:40:51,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2022-01-31 21:40:54,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 539. [2022-01-31 21:40:54,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:40:54,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:40:54,180 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:40:54,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:54,180 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:40:54,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.7555555555555555) internal successors, (79), 43 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:40:54,181 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:40:54,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:40:54,181 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:54,181 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:54,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable216 [2022-01-31 21:40:54,181 INFO L402 AbstractCegarLoop]: === Iteration 218 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:54,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:54,181 INFO L85 PathProgramCache]: Analyzing trace with hash 1708918559, now seen corresponding path program 200 times [2022-01-31 21:40:54,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:54,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328772112] [2022-01-31 21:40:54,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:54,228 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:54,271 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:54,271 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:54,315 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:54,356 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:54,356 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:54,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:54,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:54,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:54,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:54,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:40:54,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:54,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:55,993 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:55,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328772112] [2022-01-31 21:40:55,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [328772112] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:55,994 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:55,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:40:55,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460198761] [2022-01-31 21:40:55,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:55,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:40:55,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:55,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:40:55,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=2046, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:40:55,995 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:00,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:00,493 INFO L93 Difference]: Finished difference Result 862 states and 982 transitions. [2022-01-31 21:41:00,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:41:00,494 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:00,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:00,495 INFO L225 Difference]: With dead ends: 862 [2022-01-31 21:41:00,495 INFO L226 Difference]: Without dead ends: 595 [2022-01-31 21:41:00,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=220, Invalid=2230, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:41:00,495 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 69 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 3407 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 3419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:00,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 90 Invalid, 3419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3407 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:41:00,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2022-01-31 21:41:03,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 539. [2022-01-31 21:41:03,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:03,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:03,381 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:03,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:03,381 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:03,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 44 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:03,381 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:03,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:03,381 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:03,381 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:03,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable217 [2022-01-31 21:41:03,382 INFO L402 AbstractCegarLoop]: === Iteration 219 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:03,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:03,382 INFO L85 PathProgramCache]: Analyzing trace with hash 679559261, now seen corresponding path program 201 times [2022-01-31 21:41:03,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:03,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965976491] [2022-01-31 21:41:03,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:03,415 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:03,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:03,460 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:03,505 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:03,546 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:03,546 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:03,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:03,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:03,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:03,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:03,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:03,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:05,152 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:05,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965976491] [2022-01-31 21:41:05,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1965976491] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:05,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:05,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:41:05,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733194046] [2022-01-31 21:41:05,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:05,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:41:05,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:05,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:41:05,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=2135, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:41:05,153 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:09,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:09,643 INFO L93 Difference]: Finished difference Result 859 states and 979 transitions. [2022-01-31 21:41:09,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:41:09,643 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:09,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:09,644 INFO L225 Difference]: With dead ends: 859 [2022-01-31 21:41:09,644 INFO L226 Difference]: Without dead ends: 592 [2022-01-31 21:41:09,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 28 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=227, Invalid=2323, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:41:09,645 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 69 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 2981 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 2992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2981 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:09,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 64 Invalid, 2992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2981 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:41:09,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-01-31 21:41:12,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 539. [2022-01-31 21:41:12,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:12,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:12,514 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:12,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:12,515 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:12,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 45 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:12,515 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:12,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:12,515 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:12,515 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:12,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable218 [2022-01-31 21:41:12,515 INFO L402 AbstractCegarLoop]: === Iteration 220 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:12,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:12,516 INFO L85 PathProgramCache]: Analyzing trace with hash -164446241, now seen corresponding path program 202 times [2022-01-31 21:41:12,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:12,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603315968] [2022-01-31 21:41:12,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:12,566 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:12,599 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:12,599 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:12,632 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:12,662 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:12,662 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:12,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:12,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:12,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:12,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:12,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:12,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:12,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:14,322 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:14,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603315968] [2022-01-31 21:41:14,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [603315968] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:14,323 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:14,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:41:14,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474360302] [2022-01-31 21:41:14,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:14,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:41:14,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:14,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:41:14,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:41:14,324 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:18,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:18,744 INFO L93 Difference]: Finished difference Result 856 states and 976 transitions. [2022-01-31 21:41:18,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:41:18,744 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:18,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:18,745 INFO L225 Difference]: With dead ends: 856 [2022-01-31 21:41:18,745 INFO L226 Difference]: Without dead ends: 589 [2022-01-31 21:41:18,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 27 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:41:18,745 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 3345 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 3356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:18,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 78 Invalid, 3356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3345 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:41:18,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2022-01-31 21:41:21,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 539. [2022-01-31 21:41:21,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:21,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:21,630 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:21,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:21,631 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:21,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 46 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:21,631 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:21,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:21,631 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:21,631 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:21,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219 [2022-01-31 21:41:21,631 INFO L402 AbstractCegarLoop]: === Iteration 221 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:21,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:21,632 INFO L85 PathProgramCache]: Analyzing trace with hash 110313373, now seen corresponding path program 203 times [2022-01-31 21:41:21,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:21,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772945323] [2022-01-31 21:41:21,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:21,665 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:21,698 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:21,698 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:21,745 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:21,787 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:21,787 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:21,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:21,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:21,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:21,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:21,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:21,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:21,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:23,468 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:23,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772945323] [2022-01-31 21:41:23,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [772945323] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:23,468 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:23,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:41:23,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825820498] [2022-01-31 21:41:23,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:23,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:41:23,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:23,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:41:23,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=2319, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:41:23,469 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:27,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:27,853 INFO L93 Difference]: Finished difference Result 853 states and 973 transitions. [2022-01-31 21:41:27,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:41:27,854 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:27,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:27,854 INFO L225 Difference]: With dead ends: 853 [2022-01-31 21:41:27,854 INFO L226 Difference]: Without dead ends: 586 [2022-01-31 21:41:27,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 26 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=241, Invalid=2515, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:41:27,855 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 3848 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 3860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:27,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 97 Invalid, 3860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3848 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:41:27,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2022-01-31 21:41:30,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 539. [2022-01-31 21:41:30,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:30,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:30,598 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:30,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:30,598 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:30,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 47 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:30,598 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:30,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:30,598 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:30,599 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 15, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:30,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable220 [2022-01-31 21:41:30,599 INFO L402 AbstractCegarLoop]: === Iteration 222 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:30,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:30,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1496516767, now seen corresponding path program 204 times [2022-01-31 21:41:30,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:30,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211191588] [2022-01-31 21:41:30,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:30,639 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:30,674 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:30,675 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:30,702 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:30,728 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:30,729 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:30,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:30,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:30,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:30,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:30,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:30,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:32,222 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:32,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211191588] [2022-01-31 21:41:32,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211191588] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:32,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:32,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:41:32,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195173242] [2022-01-31 21:41:32,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:32,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:41:32,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:32,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:41:32,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2414, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:41:32,223 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:36,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:36,696 INFO L93 Difference]: Finished difference Result 850 states and 970 transitions. [2022-01-31 21:41:36,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:41:36,696 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:36,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:36,697 INFO L225 Difference]: With dead ends: 850 [2022-01-31 21:41:36,697 INFO L226 Difference]: Without dead ends: 583 [2022-01-31 21:41:36,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=248, Invalid=2614, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:41:36,698 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 71 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 3564 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 3575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:36,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 76 Invalid, 3575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3564 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:41:36,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2022-01-31 21:41:39,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 539. [2022-01-31 21:41:39,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:39,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:39,575 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:39,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:39,575 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:39,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.58) internal successors, (79), 48 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:39,575 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:39,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:39,576 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:39,576 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:39,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable221 [2022-01-31 21:41:39,576 INFO L402 AbstractCegarLoop]: === Iteration 223 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:39,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:39,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1558556381, now seen corresponding path program 205 times [2022-01-31 21:41:39,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:39,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872833735] [2022-01-31 21:41:39,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:39,615 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:39,650 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:39,650 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:39,688 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:39,722 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:39,722 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:39,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:39,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:39,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:39,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:39,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:39,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:41,239 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:41,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872833735] [2022-01-31 21:41:41,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [872833735] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:41,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:41,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:41:41,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802252348] [2022-01-31 21:41:41,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:41,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:41:41,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:41,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:41:41,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2511, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:41:41,240 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:45,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:45,555 INFO L93 Difference]: Finished difference Result 847 states and 967 transitions. [2022-01-31 21:41:45,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:41:45,555 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:45,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:45,556 INFO L225 Difference]: With dead ends: 847 [2022-01-31 21:41:45,556 INFO L226 Difference]: Without dead ends: 580 [2022-01-31 21:41:45,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 24 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1209 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=255, Invalid=2715, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:41:45,557 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3876 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 3887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 3876 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:45,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 92 Invalid, 3887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 3876 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:41:45,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2022-01-31 21:41:48,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 539. [2022-01-31 21:41:48,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:48,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:48,462 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:48,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:48,462 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:48,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 49 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:48,462 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:48,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:48,462 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:48,462 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:48,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable222 [2022-01-31 21:41:48,462 INFO L402 AbstractCegarLoop]: === Iteration 224 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:48,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:48,463 INFO L85 PathProgramCache]: Analyzing trace with hash -246881953, now seen corresponding path program 206 times [2022-01-31 21:41:48,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:48,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333853000] [2022-01-31 21:41:48,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:48,504 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:48,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:48,542 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:48,572 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:48,600 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:48,600 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:48,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:48,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:48,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:48,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:48,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:48,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:48,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:50,390 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:50,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333853000] [2022-01-31 21:41:50,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [333853000] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:50,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:50,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:41:50,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546577406] [2022-01-31 21:41:50,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:50,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:41:50,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:50,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:41:50,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2610, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:41:50,391 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:54,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:41:54,693 INFO L93 Difference]: Finished difference Result 844 states and 964 transitions. [2022-01-31 21:41:54,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:41:54,693 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:41:54,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:41:54,694 INFO L225 Difference]: With dead ends: 844 [2022-01-31 21:41:54,694 INFO L226 Difference]: Without dead ends: 577 [2022-01-31 21:41:54,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 22 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=262, Invalid=2818, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:41:54,695 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 89 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 4037 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 4049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 4037 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:41:54,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 71 Invalid, 4049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 4037 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:41:54,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2022-01-31 21:41:57,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 539. [2022-01-31 21:41:57,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:41:57,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:41:57,590 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:41:57,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:41:57,590 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:41:57,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 50 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:41:57,590 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:41:57,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:41:57,590 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:41:57,590 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:41:57,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable223 [2022-01-31 21:41:57,591 INFO L402 AbstractCegarLoop]: === Iteration 225 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:41:57,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:41:57,591 INFO L85 PathProgramCache]: Analyzing trace with hash -1064530403, now seen corresponding path program 207 times [2022-01-31 21:41:57,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:41:57,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847157127] [2022-01-31 21:41:57,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:41:57,620 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:57,647 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:57,647 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:57,686 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:57,720 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:41:57,721 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:41:57,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:41:57,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:57,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:41:57,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:57,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:41:57,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:41:57,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:41:59,432 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:41:59,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847157127] [2022-01-31 21:41:59,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [847157127] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:41:59,433 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:41:59,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-01-31 21:41:59,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973800511] [2022-01-31 21:41:59,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:41:59,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-01-31 21:41:59,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:41:59,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-01-31 21:41:59,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=2711, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:41:59,434 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:03,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:03,633 INFO L93 Difference]: Finished difference Result 841 states and 961 transitions. [2022-01-31 21:42:03,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-01-31 21:42:03,633 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:42:03,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:03,634 INFO L225 Difference]: With dead ends: 841 [2022-01-31 21:42:03,634 INFO L226 Difference]: Without dead ends: 574 [2022-01-31 21:42:03,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 22 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=269, Invalid=2923, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:42:03,634 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 84 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 4154 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 4166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 4154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:03,634 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 89 Invalid, 4166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 4154 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:42:03,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2022-01-31 21:42:06,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 539. [2022-01-31 21:42:06,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:06,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:42:06,453 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:42:06,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:06,453 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:42:06,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.490566037735849) internal successors, (79), 51 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:06,453 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:42:06,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:42:06,454 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:06,454 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:06,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable224 [2022-01-31 21:42:06,454 INFO L402 AbstractCegarLoop]: === Iteration 226 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:06,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:06,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1642088991, now seen corresponding path program 208 times [2022-01-31 21:42:06,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:06,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396414360] [2022-01-31 21:42:06,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:06,500 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:06,545 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:06,545 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:06,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:06,620 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:06,620 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:06,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:06,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:06,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:06,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:06,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:06,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:06,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:08,208 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:08,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396414360] [2022-01-31 21:42:08,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [396414360] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:08,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:08,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-01-31 21:42:08,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034106722] [2022-01-31 21:42:08,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:08,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-01-31 21:42:08,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:08,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-01-31 21:42:08,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=2814, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:42:08,210 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:12,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:12,417 INFO L93 Difference]: Finished difference Result 839 states and 959 transitions. [2022-01-31 21:42:12,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-01-31 21:42:12,417 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:42:12,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:12,418 INFO L225 Difference]: With dead ends: 839 [2022-01-31 21:42:12,418 INFO L226 Difference]: Without dead ends: 572 [2022-01-31 21:42:12,418 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 21 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1107 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=276, Invalid=3030, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:42:12,418 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 100 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 4301 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 4313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 4301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:12,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 73 Invalid, 4313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 4301 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:42:12,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2022-01-31 21:42:15,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 539. [2022-01-31 21:42:15,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 524 states have (on average 1.133587786259542) internal successors, (594), 527 states have internal predecessors, (594), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:15,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 611 transitions. [2022-01-31 21:42:15,073 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 611 transitions. Word has length 85 [2022-01-31 21:42:15,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:15,073 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 611 transitions. [2022-01-31 21:42:15,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.462962962962963) internal successors, (79), 52 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:15,073 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 611 transitions. [2022-01-31 21:42:15,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:42:15,074 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:15,074 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:15,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225 [2022-01-31 21:42:15,074 INFO L402 AbstractCegarLoop]: === Iteration 227 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:15,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:15,074 INFO L85 PathProgramCache]: Analyzing trace with hash 630971741, now seen corresponding path program 209 times [2022-01-31 21:42:15,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:15,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517453568] [2022-01-31 21:42:15,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:15,117 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:15,117 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:42:15,164 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:15,203 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:15,203 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:15,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:15,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:15,310 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:15,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:15,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:15,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:15,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:16,613 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:16,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517453568] [2022-01-31 21:42:16,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [517453568] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:16,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:16,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:42:16,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709700212] [2022-01-31 21:42:16,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:16,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:42:16,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:16,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:42:16,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2918, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:42:16,614 INFO L87 Difference]: Start difference. First operand 539 states and 611 transitions. Second operand has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:20,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:20,737 INFO L93 Difference]: Finished difference Result 852 states and 976 transitions. [2022-01-31 21:42:20,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-01-31 21:42:20,737 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 85 [2022-01-31 21:42:20,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:20,738 INFO L225 Difference]: With dead ends: 852 [2022-01-31 21:42:20,738 INFO L226 Difference]: Without dead ends: 585 [2022-01-31 21:42:20,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 6 SyntacticMatches, 20 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=314, Invalid=3592, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:42:20,739 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 111 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 3938 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 3956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 3938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:20,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 72 Invalid, 3956 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 3938 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:42:20,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2022-01-31 21:42:23,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 542. [2022-01-31 21:42:23,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 527 states have (on average 1.1366223908918407) internal successors, (599), 530 states have internal predecessors, (599), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:23,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 616 transitions. [2022-01-31 21:42:23,566 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 616 transitions. Word has length 85 [2022-01-31 21:42:23,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:23,566 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 616 transitions. [2022-01-31 21:42:23,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 53 states have internal predecessors, (79), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:23,567 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 616 transitions. [2022-01-31 21:42:23,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-01-31 21:42:23,567 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:23,567 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:23,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable226 [2022-01-31 21:42:23,567 INFO L402 AbstractCegarLoop]: === Iteration 228 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:23,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:23,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1110998131, now seen corresponding path program 9 times [2022-01-31 21:42:23,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:23,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48394732] [2022-01-31 21:42:23,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:23,605 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:23,694 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:23,694 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:23,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:23,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:23,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:23,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:23,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:23,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:23,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:24,053 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:24,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48394732] [2022-01-31 21:42:24,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [48394732] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:24,053 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:24,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:42:24,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464621507] [2022-01-31 21:42:24,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:24,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:42:24,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:24,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:42:24,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:42:24,054 INFO L87 Difference]: Start difference. First operand 542 states and 616 transitions. Second operand has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:42:27,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:27,499 INFO L93 Difference]: Finished difference Result 888 states and 1023 transitions. [2022-01-31 21:42:27,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:42:27,500 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 87 [2022-01-31 21:42:27,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:27,501 INFO L225 Difference]: With dead ends: 888 [2022-01-31 21:42:27,501 INFO L226 Difference]: Without dead ends: 612 [2022-01-31 21:42:27,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 24 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=353, Invalid=837, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:42:27,501 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 118 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:27,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 31 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:42:27,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2022-01-31 21:42:30,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 569. [2022-01-31 21:42:30,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 569 states, 554 states have (on average 1.135379061371841) internal successors, (629), 557 states have internal predecessors, (629), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:30,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 569 states to 569 states and 646 transitions. [2022-01-31 21:42:30,593 INFO L78 Accepts]: Start accepts. Automaton has 569 states and 646 transitions. Word has length 87 [2022-01-31 21:42:30,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:30,593 INFO L470 AbstractCegarLoop]: Abstraction has 569 states and 646 transitions. [2022-01-31 21:42:30,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.96) internal successors, (74), 24 states have internal predecessors, (74), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:42:30,593 INFO L276 IsEmpty]: Start isEmpty. Operand 569 states and 646 transitions. [2022-01-31 21:42:30,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:42:30,594 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:30,594 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:30,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable227 [2022-01-31 21:42:30,594 INFO L402 AbstractCegarLoop]: === Iteration 229 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:30,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:30,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1492238652, now seen corresponding path program 210 times [2022-01-31 21:42:30,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:30,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536497441] [2022-01-31 21:42:30,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:30,642 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:30,676 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:30,676 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:30,710 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:30,751 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:30,751 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:30,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:30,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:30,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:30,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:30,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:30,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:30,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:32,360 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:32,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536497441] [2022-01-31 21:42:32,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [536497441] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:32,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:32,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:42:32,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143357045] [2022-01-31 21:42:32,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:32,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:42:32,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:32,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:42:32,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1404, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:42:32,361 INFO L87 Difference]: Start difference. First operand 569 states and 646 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:36,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:36,730 INFO L93 Difference]: Finished difference Result 918 states and 1050 transitions. [2022-01-31 21:42:36,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:42:36,730 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:42:36,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:36,739 INFO L225 Difference]: With dead ends: 918 [2022-01-31 21:42:36,739 INFO L226 Difference]: Without dead ends: 624 [2022-01-31 21:42:36,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 6 SyntacticMatches, 39 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 648 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=215, Invalid=2041, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:42:36,740 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 63 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 2620 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 2646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:36,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 63 Invalid, 2646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2620 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:42:36,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2022-01-31 21:42:39,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 572. [2022-01-31 21:42:39,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 572 states, 557 states have (on average 1.1364452423698383) internal successors, (633), 560 states have internal predecessors, (633), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:39,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 572 states to 572 states and 650 transitions. [2022-01-31 21:42:39,559 INFO L78 Accepts]: Start accepts. Automaton has 572 states and 650 transitions. Word has length 88 [2022-01-31 21:42:39,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:39,559 INFO L470 AbstractCegarLoop]: Abstraction has 572 states and 650 transitions. [2022-01-31 21:42:39,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:39,559 INFO L276 IsEmpty]: Start isEmpty. Operand 572 states and 650 transitions. [2022-01-31 21:42:39,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:42:39,560 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:39,560 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:39,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable228 [2022-01-31 21:42:39,560 INFO L402 AbstractCegarLoop]: === Iteration 230 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:39,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:39,560 INFO L85 PathProgramCache]: Analyzing trace with hash -284458628, now seen corresponding path program 2 times [2022-01-31 21:42:39,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:39,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380835624] [2022-01-31 21:42:39,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:39,590 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:39,616 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:39,616 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:39,644 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:39,679 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:39,680 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:39,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:39,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:39,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:39,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:39,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:39,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:41,203 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:41,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [380835624] [2022-01-31 21:42:41,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [380835624] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:41,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:41,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:42:41,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122071370] [2022-01-31 21:42:41,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:41,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:42:41,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:41,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:42:41,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:42:41,204 INFO L87 Difference]: Start difference. First operand 572 states and 650 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:45,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:45,334 INFO L93 Difference]: Finished difference Result 617 states and 698 transitions. [2022-01-31 21:42:45,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:42:45,334 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:42:45,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:45,335 INFO L225 Difference]: With dead ends: 617 [2022-01-31 21:42:45,335 INFO L226 Difference]: Without dead ends: 615 [2022-01-31 21:42:45,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 6 SyntacticMatches, 39 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=218, Invalid=1852, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:42:45,335 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 59 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 3391 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 3408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 3391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:45,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 101 Invalid, 3408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 3391 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:42:45,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2022-01-31 21:42:48,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 575. [2022-01-31 21:42:48,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 560 states have (on average 1.1375) internal successors, (637), 563 states have internal predecessors, (637), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:48,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 654 transitions. [2022-01-31 21:42:48,013 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 654 transitions. Word has length 88 [2022-01-31 21:42:48,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:48,013 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 654 transitions. [2022-01-31 21:42:48,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 36 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:48,013 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 654 transitions. [2022-01-31 21:42:48,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:42:48,014 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:48,014 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 19, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:48,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable229 [2022-01-31 21:42:48,014 INFO L402 AbstractCegarLoop]: === Iteration 231 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:48,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:48,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1478828156, now seen corresponding path program 211 times [2022-01-31 21:42:48,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:48,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312529698] [2022-01-31 21:42:48,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:48,053 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:48,088 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:48,088 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:48,116 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:48,150 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:48,150 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:48,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:48,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:48,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:48,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:48,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:48,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:48,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:42:49,530 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:42:49,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312529698] [2022-01-31 21:42:49,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [312529698] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:42:49,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:42:49,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:42:49,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305648896] [2022-01-31 21:42:49,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:42:49,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:42:49,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:42:49,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:42:49,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1559, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:42:49,531 INFO L87 Difference]: Start difference. First operand 575 states and 654 transitions. Second operand has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:54,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:42:54,936 INFO L93 Difference]: Finished difference Result 955 states and 1087 transitions. [2022-01-31 21:42:54,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:42:54,937 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:42:54,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:42:54,938 INFO L225 Difference]: With dead ends: 955 [2022-01-31 21:42:54,938 INFO L226 Difference]: Without dead ends: 661 [2022-01-31 21:42:54,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 6 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=178, Invalid=1802, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:42:54,938 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 56 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2778 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 2792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 2778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:42:54,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 56 Invalid, 2792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 2778 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:42:54,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2022-01-31 21:42:59,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 628. [2022-01-31 21:42:59,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 628 states, 613 states have (on average 1.1256117455138663) internal successors, (690), 616 states have internal predecessors, (690), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:42:59,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 628 states to 628 states and 707 transitions. [2022-01-31 21:42:59,056 INFO L78 Accepts]: Start accepts. Automaton has 628 states and 707 transitions. Word has length 88 [2022-01-31 21:42:59,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:42:59,056 INFO L470 AbstractCegarLoop]: Abstraction has 628 states and 707 transitions. [2022-01-31 21:42:59,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.05) internal successors, (82), 38 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:42:59,056 INFO L276 IsEmpty]: Start isEmpty. Operand 628 states and 707 transitions. [2022-01-31 21:42:59,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:42:59,057 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:42:59,057 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:42:59,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable230 [2022-01-31 21:42:59,057 INFO L402 AbstractCegarLoop]: === Iteration 232 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:42:59,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:42:59,057 INFO L85 PathProgramCache]: Analyzing trace with hash -207351682, now seen corresponding path program 212 times [2022-01-31 21:42:59,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:42:59,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700319874] [2022-01-31 21:42:59,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:42:59,087 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:59,126 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:59,126 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:59,166 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:59,194 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:42:59,194 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:42:59,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:42:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:59,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:42:59,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:59,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:42:59,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:42:59,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:00,756 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:00,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700319874] [2022-01-31 21:43:00,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1700319874] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:00,757 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:00,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:43:00,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888006010] [2022-01-31 21:43:00,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:00,757 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:43:00,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:00,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:43:00,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1636, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:43:00,757 INFO L87 Difference]: Start difference. First operand 628 states and 707 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:06,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:43:06,928 INFO L93 Difference]: Finished difference Result 1002 states and 1132 transitions. [2022-01-31 21:43:06,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:43:06,928 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:43:06,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:43:06,929 INFO L225 Difference]: With dead ends: 1002 [2022-01-31 21:43:06,929 INFO L226 Difference]: Without dead ends: 708 [2022-01-31 21:43:06,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 37 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=180, Invalid=1800, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:43:06,929 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2878 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 2891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:43:06,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 70 Invalid, 2891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2878 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:43:06,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2022-01-31 21:43:10,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 631. [2022-01-31 21:43:10,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:43:10,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:43:10,748 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:43:10,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:43:10,748 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:43:10,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 39 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:10,748 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:43:10,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:43:10,749 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:43:10,749 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:43:10,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable231 [2022-01-31 21:43:10,749 INFO L402 AbstractCegarLoop]: === Iteration 233 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:43:10,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:43:10,749 INFO L85 PathProgramCache]: Analyzing trace with hash 471920572, now seen corresponding path program 213 times [2022-01-31 21:43:10,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:43:10,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498193554] [2022-01-31 21:43:10,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:43:10,789 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:10,817 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:10,817 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:10,855 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:10,891 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:10,892 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:10,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:43:10,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:11,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:43:11,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:11,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:43:11,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:11,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:12,580 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:12,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498193554] [2022-01-31 21:43:12,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1498193554] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:12,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:12,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:43:12,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137146152] [2022-01-31 21:43:12,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:12,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:43:12,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:12,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:43:12,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1715, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:43:12,581 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:19,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:43:19,096 INFO L93 Difference]: Finished difference Result 1005 states and 1135 transitions. [2022-01-31 21:43:19,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:43:19,096 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:43:19,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:43:19,097 INFO L225 Difference]: With dead ends: 1005 [2022-01-31 21:43:19,097 INFO L226 Difference]: Without dead ends: 711 [2022-01-31 21:43:19,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 36 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=187, Invalid=1883, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:43:19,098 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 3648 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 3661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:43:19,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 85 Invalid, 3661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3648 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:43:19,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 711 states. [2022-01-31 21:43:23,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 711 to 631. [2022-01-31 21:43:23,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:43:23,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:43:23,129 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:43:23,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:43:23,129 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:43:23,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.9523809523809523) internal successors, (82), 40 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:23,129 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:43:23,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:43:23,130 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:43:23,130 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:43:23,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable232 [2022-01-31 21:43:23,130 INFO L402 AbstractCegarLoop]: === Iteration 234 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:43:23,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:43:23,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1032620350, now seen corresponding path program 214 times [2022-01-31 21:43:23,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:43:23,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982985604] [2022-01-31 21:43:23,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:43:23,173 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:23,218 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:23,219 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:23,265 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:23,306 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:23,307 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:23,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:43:23,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:23,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:43:23,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:23,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:43:23,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:23,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:24,834 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:24,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982985604] [2022-01-31 21:43:24,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [982985604] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:24,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:24,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:43:24,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150679258] [2022-01-31 21:43:24,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:24,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:43:24,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:24,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:43:24,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1796, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:43:24,835 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:30,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:43:30,778 INFO L93 Difference]: Finished difference Result 1002 states and 1132 transitions. [2022-01-31 21:43:30,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:43:30,778 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:43:30,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:43:30,779 INFO L225 Difference]: With dead ends: 1002 [2022-01-31 21:43:30,779 INFO L226 Difference]: Without dead ends: 708 [2022-01-31 21:43:30,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 35 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=194, Invalid=1968, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:43:30,781 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 3217 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 3230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:43:30,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 74 Invalid, 3230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3217 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:43:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2022-01-31 21:43:34,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 631. [2022-01-31 21:43:34,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:43:34,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:43:34,535 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:43:34,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:43:34,535 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:43:34,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.9069767441860466) internal successors, (82), 41 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:34,536 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:43:34,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:43:34,536 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:43:34,536 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:43:34,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable233 [2022-01-31 21:43:34,536 INFO L402 AbstractCegarLoop]: === Iteration 235 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:43:34,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:43:34,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1073295100, now seen corresponding path program 215 times [2022-01-31 21:43:34,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:43:34,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166169058] [2022-01-31 21:43:34,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:43:34,583 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:34,627 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:34,627 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:34,660 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:34,692 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:34,692 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:34,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:43:34,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:34,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:43:34,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:34,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:43:34,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:34,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:36,129 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:36,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166169058] [2022-01-31 21:43:36,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [166169058] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:36,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:36,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:43:36,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038043811] [2022-01-31 21:43:36,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:36,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:43:36,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:36,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:43:36,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1879, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:43:36,130 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:42,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:43:42,014 INFO L93 Difference]: Finished difference Result 999 states and 1129 transitions. [2022-01-31 21:43:42,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:43:42,015 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:43:42,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:43:42,015 INFO L225 Difference]: With dead ends: 999 [2022-01-31 21:43:42,015 INFO L226 Difference]: Without dead ends: 705 [2022-01-31 21:43:42,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 34 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=201, Invalid=2055, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:43:42,016 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 3171 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 3183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:43:42,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 66 Invalid, 3183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3171 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:43:42,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2022-01-31 21:43:45,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 631. [2022-01-31 21:43:45,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:43:45,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:43:45,733 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:43:45,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:43:45,733 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:43:45,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8636363636363635) internal successors, (82), 42 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:45,733 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:43:45,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:43:45,734 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:43:45,734 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:43:45,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable234 [2022-01-31 21:43:45,734 INFO L402 AbstractCegarLoop]: === Iteration 236 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:43:45,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:43:45,734 INFO L85 PathProgramCache]: Analyzing trace with hash 1517195774, now seen corresponding path program 216 times [2022-01-31 21:43:45,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:43:45,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051240891] [2022-01-31 21:43:45,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:43:45,779 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:45,822 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:45,822 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:45,854 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:45,893 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:45,893 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:45,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:43:45,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:46,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:43:46,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:46,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:43:46,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:46,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:47,630 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:47,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051240891] [2022-01-31 21:43:47,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2051240891] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:47,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:47,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:43:47,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437503425] [2022-01-31 21:43:47,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:47,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:43:47,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:47,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:43:47,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1964, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:43:47,631 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:53,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:43:53,376 INFO L93 Difference]: Finished difference Result 996 states and 1126 transitions. [2022-01-31 21:43:53,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:43:53,377 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:43:53,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:43:53,377 INFO L225 Difference]: With dead ends: 996 [2022-01-31 21:43:53,377 INFO L226 Difference]: Without dead ends: 702 [2022-01-31 21:43:53,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 33 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1156 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=208, Invalid=2144, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:43:53,378 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 62 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 3046 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 3058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3046 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:43:53,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 66 Invalid, 3058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3046 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:43:53,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2022-01-31 21:43:57,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 631. [2022-01-31 21:43:57,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:43:57,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:43:57,185 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:43:57,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:43:57,185 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:43:57,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 43 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:43:57,185 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:43:57,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:43:57,186 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:43:57,186 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:43:57,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable235 [2022-01-31 21:43:57,186 INFO L402 AbstractCegarLoop]: === Iteration 237 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:43:57,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:43:57,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1036115516, now seen corresponding path program 217 times [2022-01-31 21:43:57,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:43:57,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722892569] [2022-01-31 21:43:57,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:43:57,226 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:57,253 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:57,253 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:57,282 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:57,317 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:43:57,317 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:43:57,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:43:57,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:57,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:43:57,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:57,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:43:57,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:43:57,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:43:58,869 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:43:58,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722892569] [2022-01-31 21:43:58,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [722892569] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:43:58,869 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:43:58,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:43:58,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902473832] [2022-01-31 21:43:58,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:43:58,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:43:58,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:43:58,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:43:58,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2051, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:43:58,870 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:05,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:44:05,211 INFO L93 Difference]: Finished difference Result 993 states and 1123 transitions. [2022-01-31 21:44:05,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:44:05,211 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:44:05,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:44:05,212 INFO L225 Difference]: With dead ends: 993 [2022-01-31 21:44:05,212 INFO L226 Difference]: Without dead ends: 699 [2022-01-31 21:44:05,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 32 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1209 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=215, Invalid=2235, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:44:05,213 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 3696 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 3708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:44:05,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 98 Invalid, 3708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3696 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:44:05,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2022-01-31 21:44:09,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 631. [2022-01-31 21:44:09,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:44:09,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:44:09,074 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:44:09,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:44:09,074 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:44:09,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 44 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:09,074 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:44:09,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:44:09,075 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:44:09,075 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:44:09,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable236 [2022-01-31 21:44:09,075 INFO L402 AbstractCegarLoop]: === Iteration 238 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:44:09,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:44:09,075 INFO L85 PathProgramCache]: Analyzing trace with hash 683027134, now seen corresponding path program 218 times [2022-01-31 21:44:09,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:44:09,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642317174] [2022-01-31 21:44:09,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:44:09,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:09,152 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:09,152 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:09,198 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:09,234 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:09,234 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:09,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:44:09,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:09,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:44:09,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:09,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:44:09,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:09,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:44:10,925 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:44:10,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642317174] [2022-01-31 21:44:10,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [642317174] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:44:10,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:44:10,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:44:10,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591875964] [2022-01-31 21:44:10,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:44:10,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:44:10,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:44:10,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:44:10,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=2140, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:44:10,926 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:17,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:44:17,301 INFO L93 Difference]: Finished difference Result 990 states and 1120 transitions. [2022-01-31 21:44:17,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:44:17,301 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:44:17,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:44:17,302 INFO L225 Difference]: With dead ends: 990 [2022-01-31 21:44:17,302 INFO L226 Difference]: Without dead ends: 696 [2022-01-31 21:44:17,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 31 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1253 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=222, Invalid=2328, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:44:17,303 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 70 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 3956 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 3969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3956 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:44:17,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 90 Invalid, 3969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3956 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:44:17,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2022-01-31 21:44:21,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 631. [2022-01-31 21:44:21,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:44:21,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:44:21,466 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:44:21,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:44:21,466 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:44:21,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 45 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:21,466 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:44:21,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:44:21,467 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:44:21,467 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:44:21,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable237 [2022-01-31 21:44:21,467 INFO L402 AbstractCegarLoop]: === Iteration 239 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:44:21,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:44:21,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1366360708, now seen corresponding path program 219 times [2022-01-31 21:44:21,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:44:21,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407604338] [2022-01-31 21:44:21,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:44:21,508 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:21,545 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:21,545 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:21,574 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:21,645 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:21,646 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:21,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:44:21,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:21,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:44:21,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:21,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:44:21,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:21,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:44:23,453 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:44:23,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407604338] [2022-01-31 21:44:23,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407604338] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:44:23,453 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:44:23,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:44:23,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402742543] [2022-01-31 21:44:23,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:44:23,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:44:23,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:44:23,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:44:23,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=2231, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:44:23,454 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:29,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:44:29,704 INFO L93 Difference]: Finished difference Result 987 states and 1117 transitions. [2022-01-31 21:44:29,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:44:29,704 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:44:29,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:44:29,705 INFO L225 Difference]: With dead ends: 987 [2022-01-31 21:44:29,705 INFO L226 Difference]: Without dead ends: 693 [2022-01-31 21:44:29,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 30 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1288 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=229, Invalid=2423, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:44:29,705 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 84 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 3712 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 3725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:44:29,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 74 Invalid, 3725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3712 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:44:29,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2022-01-31 21:44:33,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 631. [2022-01-31 21:44:33,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:44:33,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:44:33,994 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:44:33,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:44:33,994 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:44:33,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.7083333333333333) internal successors, (82), 46 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:33,994 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:44:33,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:44:33,995 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:44:33,995 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:44:33,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable238 [2022-01-31 21:44:33,995 INFO L402 AbstractCegarLoop]: === Iteration 240 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:44:33,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:44:33,995 INFO L85 PathProgramCache]: Analyzing trace with hash -942713986, now seen corresponding path program 220 times [2022-01-31 21:44:33,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:44:33,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458316401] [2022-01-31 21:44:33,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:44:34,035 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:34,071 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:34,071 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:34,114 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:34,155 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:34,155 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:34,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:44:34,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:34,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:44:34,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:34,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:44:34,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:34,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:44:35,887 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:44:35,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458316401] [2022-01-31 21:44:35,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1458316401] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:44:35,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:44:35,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:44:35,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273353833] [2022-01-31 21:44:35,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:44:35,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:44:35,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:44:35,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:44:35,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=2324, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:44:35,889 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:42,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:44:42,041 INFO L93 Difference]: Finished difference Result 984 states and 1114 transitions. [2022-01-31 21:44:42,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:44:42,041 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 88 [2022-01-31 21:44:42,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:44:42,042 INFO L225 Difference]: With dead ends: 984 [2022-01-31 21:44:42,042 INFO L226 Difference]: Without dead ends: 690 [2022-01-31 21:44:42,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 6 SyntacticMatches, 29 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=236, Invalid=2520, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:44:42,043 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 64 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 3528 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 3540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 3528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:44:42,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 88 Invalid, 3540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 3528 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:44:42,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2022-01-31 21:44:46,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 631. [2022-01-31 21:44:46,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 616 states have (on average 1.125) internal successors, (693), 619 states have internal predecessors, (693), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-01-31 21:44:46,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 710 transitions. [2022-01-31 21:44:46,483 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 710 transitions. Word has length 88 [2022-01-31 21:44:46,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:44:46,484 INFO L470 AbstractCegarLoop]: Abstraction has 631 states and 710 transitions. [2022-01-31 21:44:46,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.6734693877551021) internal successors, (82), 47 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:44:46,484 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 710 transitions. [2022-01-31 21:44:46,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:44:46,484 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:44:46,484 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:44:46,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable239 [2022-01-31 21:44:46,484 INFO L402 AbstractCegarLoop]: === Iteration 241 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:44:46,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:44:46,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1972073284, now seen corresponding path program 221 times [2022-01-31 21:44:46,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:44:46,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305247500] [2022-01-31 21:44:46,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:44:46,518 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:46,561 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:46,561 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:46,598 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:46,630 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:44:46,630 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:44:46,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:44:46,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:46,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:44:46,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:46,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-01-31 21:44:46,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:44:46,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:44:48,407 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:44:48,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305247500] [2022-01-31 21:44:48,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [305247500] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:44:48,408 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:44:48,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:44:48,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630036853] [2022-01-31 21:44:48,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:44:48,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:44:48,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:44:48,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:44:48,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2419, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:44:48,408 INFO L87 Difference]: Start difference. First operand 631 states and 710 transitions. Second operand has 50 states, 50 states have (on average 1.64) internal successors, (82), 48 states have internal predecessors, (82), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2)