/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/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:09:39,816 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:09:39,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:09:39,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:09:39,843 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 21:09:39,843 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 21:09:39,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 21:09:39,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 21:09:39,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 21:09:39,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 21:09:39,847 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 21:09:39,848 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 21:09:39,849 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 21:09:39,852 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 21:09:39,853 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 21:09:39,853 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 21:09:39,855 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 21:09:39,860 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:09:39,861 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:09:39,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:09:39,866 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 21:09:39,872 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:09:39,891 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:09:39,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:09:39,893 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:09:39,894 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:09:39,894 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:09:39,894 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:09:39,895 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:09:40,122 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:09:40,155 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:09:40,157 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:09:40,158 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:09:40,158 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:09:40,159 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2022-01-31 21:09:40,220 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07add32df/5ac625cddee14e329cce7d8e80d3e207/FLAG4d5434ec3 [2022-01-31 21:09:40,530 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:09:40,531 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2022-01-31 21:09:40,534 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07add32df/5ac625cddee14e329cce7d8e80d3e207/FLAG4d5434ec3 [2022-01-31 21:09:40,961 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07add32df/5ac625cddee14e329cce7d8e80d3e207 [2022-01-31 21:09:40,964 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:09:40,965 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:09:40,967 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:09:40,967 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:09:40,969 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:09:40,969 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:09:40" (1/1) ... [2022-01-31 21:09:40,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@321a71c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:40, skipping insertion in model container [2022-01-31 21:09:40,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:09:40" (1/1) ... [2022-01-31 21:09:40,974 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:09:40,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:09:41,106 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2022-01-31 21:09:41,139 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:09:41,145 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:09:41,154 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2022-01-31 21:09:41,161 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:09:41,169 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:09:41,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41 WrapperNode [2022-01-31 21:09:41,170 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:09:41,171 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:09:41,171 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:09:41,171 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:09:41,178 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,178 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,194 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:09:41,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:09:41,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:09:41,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:09:41,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (1/1) ... [2022-01-31 21:09:41,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:09:41,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:09:41,229 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 21:09:41,259 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 21:09:41,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:09:41,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:09:41,268 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:09:41,268 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:09:41,268 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:09:41,268 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:09:41,269 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:09:41,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:09:41,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:09:41,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:09:41,271 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:09:41,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:09:41,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:09:41,316 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:09:41,318 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:09:41,458 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:09:41,478 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:09:41,478 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-31 21:09:41,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:09:41 BoogieIcfgContainer [2022-01-31 21:09:41,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:09:41,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:09:41,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:09:41,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:09:41,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:09:40" (1/3) ... [2022-01-31 21:09:41,483 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65399a82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:09:41, skipping insertion in model container [2022-01-31 21:09:41,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:09:41" (2/3) ... [2022-01-31 21:09:41,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65399a82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:09:41, skipping insertion in model container [2022-01-31 21:09:41,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:09:41" (3/3) ... [2022-01-31 21:09:41,484 INFO L111 eAbstractionObserver]: Analyzing ICFG nested-3.c [2022-01-31 21:09:41,488 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:09:41,488 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:09:41,529 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:09:41,534 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 21:09:41,534 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:09:41,553 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 21:09:41,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-01-31 21:09:41,564 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:41,565 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:41,565 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:41,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:41,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1677248157, now seen corresponding path program 1 times [2022-01-31 21:09:41,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:41,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292138707] [2022-01-31 21:09:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:41,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:41,640 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:09:41,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:41,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:41,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:41,762 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 21:09:41,763 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:41,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292138707] [2022-01-31 21:09:41,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [292138707] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:41,765 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:41,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:09:41,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812905286] [2022-01-31 21:09:41,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:41,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:09:41,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:41,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:09:41,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:09:41,790 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:41,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:41,844 INFO L93 Difference]: Finished difference Result 40 states and 61 transitions. [2022-01-31 21:09:41,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:09:41,845 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-01-31 21:09:41,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:41,849 INFO L225 Difference]: With dead ends: 40 [2022-01-31 21:09:41,849 INFO L226 Difference]: Without dead ends: 23 [2022-01-31 21:09:41,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:09:41,853 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 8 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:41,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 27 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:09:41,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-01-31 21:09:41,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-01-31 21:09:41,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:41,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-01-31 21:09:41,877 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2022-01-31 21:09:41,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:41,877 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-01-31 21:09:41,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:41,877 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-01-31 21:09:41,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 21:09:41,878 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:41,878 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:41,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:09:41,878 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:41,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:41,879 INFO L85 PathProgramCache]: Analyzing trace with hash -946078686, now seen corresponding path program 1 times [2022-01-31 21:09:41,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:41,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177428068] [2022-01-31 21:09:41,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:42,036 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 21:09:42,037 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:42,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:42,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:42,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,126 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 21:09:42,158 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:42,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177428068] [2022-01-31 21:09:42,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1177428068] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:42,158 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:42,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-01-31 21:09:42,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810066324] [2022-01-31 21:09:42,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:42,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-31 21:09:42,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:42,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-31 21:09:42,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:09:42,160 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:42,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:42,275 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-01-31 21:09:42,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 21:09:42,275 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-01-31 21:09:42,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:42,277 INFO L225 Difference]: With dead ends: 50 [2022-01-31 21:09:42,278 INFO L226 Difference]: Without dead ends: 36 [2022-01-31 21:09:42,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:09:42,279 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 17 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:42,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 38 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:42,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-01-31 21:09:42,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2022-01-31 21:09:42,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 23 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:42,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2022-01-31 21:09:42,287 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 17 [2022-01-31 21:09:42,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:42,287 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2022-01-31 21:09:42,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:42,287 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2022-01-31 21:09:42,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 21:09:42,288 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:42,288 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:42,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:09:42,288 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:42,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:42,289 INFO L85 PathProgramCache]: Analyzing trace with hash -944231644, now seen corresponding path program 1 times [2022-01-31 21:09:42,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:42,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042302161] [2022-01-31 21:09:42,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:42,366 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 21:09:42,367 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:42,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:42,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:42,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,475 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 21:09:42,602 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:42,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042302161] [2022-01-31 21:09:42,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2042302161] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:42,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:42,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-01-31 21:09:42,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478445000] [2022-01-31 21:09:42,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:42,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-31 21:09:42,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:42,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-31 21:09:42,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:09:42,606 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:42,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:42,690 INFO L93 Difference]: Finished difference Result 58 states and 75 transitions. [2022-01-31 21:09:42,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 21:09:42,690 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-01-31 21:09:42,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:42,692 INFO L225 Difference]: With dead ends: 58 [2022-01-31 21:09:42,693 INFO L226 Difference]: Without dead ends: 36 [2022-01-31 21:09:42,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:09:42,699 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 16 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:42,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 42 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:42,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-01-31 21:09:42,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-01-31 21:09:42,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 25 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:42,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-01-31 21:09:42,712 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2022-01-31 21:09:42,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:42,712 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-01-31 21:09:42,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:42,712 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-01-31 21:09:42,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 21:09:42,713 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:42,713 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:42,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:09:42,714 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:42,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:42,714 INFO L85 PathProgramCache]: Analyzing trace with hash -206914972, now seen corresponding path program 1 times [2022-01-31 21:09:42,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:42,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012655271] [2022-01-31 21:09:42,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:42,791 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 21:09:42,791 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:42,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:42,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:42,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:42,934 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 21:09:43,056 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:43,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012655271] [2022-01-31 21:09:43,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1012655271] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:43,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:43,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-01-31 21:09:43,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233931449] [2022-01-31 21:09:43,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:43,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 21:09:43,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:43,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 21:09:43,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:09:43,058 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:43,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:43,298 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2022-01-31 21:09:43,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:09:43,299 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-01-31 21:09:43,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:43,299 INFO L225 Difference]: With dead ends: 56 [2022-01-31 21:09:43,300 INFO L226 Difference]: Without dead ends: 54 [2022-01-31 21:09:43,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:09:43,300 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 27 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:43,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 58 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:43,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-01-31 21:09:43,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 43. [2022-01-31 21:09:43,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 36 states have internal predecessors, (45), 4 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 21:09:43,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2022-01-31 21:09:43,308 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 17 [2022-01-31 21:09:43,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:43,308 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2022-01-31 21:09:43,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:43,308 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2022-01-31 21:09:43,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-01-31 21:09:43,309 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:43,309 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:43,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:09:43,309 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:43,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:43,310 INFO L85 PathProgramCache]: Analyzing trace with hash -2068588025, now seen corresponding path program 1 times [2022-01-31 21:09:43,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:43,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236335679] [2022-01-31 21:09:43,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:43,358 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 21:09:43,359 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:43,418 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:43,465 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:43,465 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:43,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:43,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:43,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:43,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:43,619 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 21:09:43,721 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:43,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236335679] [2022-01-31 21:09:43,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1236335679] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:43,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:43,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:09:43,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595146008] [2022-01-31 21:09:43,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:43,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:09:43,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:43,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:09:43,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:09:43,725 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:43,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:43,945 INFO L93 Difference]: Finished difference Result 91 states and 112 transitions. [2022-01-31 21:09:43,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:09:43,945 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-01-31 21:09:43,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:43,946 INFO L225 Difference]: With dead ends: 91 [2022-01-31 21:09:43,946 INFO L226 Difference]: Without dead ends: 67 [2022-01-31 21:09:43,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:09:43,947 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 40 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:43,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 64 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:43,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-01-31 21:09:43,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 51. [2022-01-31 21:09:43,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 44 states have internal predecessors, (55), 4 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 21:09:43,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 62 transitions. [2022-01-31 21:09:43,959 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 62 transitions. Word has length 20 [2022-01-31 21:09:43,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:43,960 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 62 transitions. [2022-01-31 21:09:43,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:43,960 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 62 transitions. [2022-01-31 21:09:43,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 21:09:43,961 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:43,962 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:43,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:09:43,962 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:43,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:43,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1319592892, now seen corresponding path program 2 times [2022-01-31 21:09:43,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:43,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773136834] [2022-01-31 21:09:43,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:44,007 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:44,054 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:44,055 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:44,094 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:44,148 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 21:09:44,148 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:44,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:44,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:44,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:44,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:44,270 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 21:09:44,417 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:44,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773136834] [2022-01-31 21:09:44,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1773136834] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:44,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:44,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:09:44,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205095873] [2022-01-31 21:09:44,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:44,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:09:44,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:44,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:09:44,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:09:44,418 INFO L87 Difference]: Start difference. First operand 51 states and 62 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:44,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:44,704 INFO L93 Difference]: Finished difference Result 101 states and 123 transitions. [2022-01-31 21:09:44,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:09:44,704 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-01-31 21:09:44,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:44,706 INFO L225 Difference]: With dead ends: 101 [2022-01-31 21:09:44,706 INFO L226 Difference]: Without dead ends: 77 [2022-01-31 21:09:44,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:09:44,707 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 40 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:44,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 76 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:09:44,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-01-31 21:09:44,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2022-01-31 21:09:44,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 47 states have internal predecessors, (59), 4 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 21:09:44,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 66 transitions. [2022-01-31 21:09:44,714 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 66 transitions. Word has length 23 [2022-01-31 21:09:44,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:44,715 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 66 transitions. [2022-01-31 21:09:44,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:44,715 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 66 transitions. [2022-01-31 21:09:44,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-01-31 21:09:44,716 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:44,716 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:44,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:09:44,716 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:44,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:44,716 INFO L85 PathProgramCache]: Analyzing trace with hash -360688409, now seen corresponding path program 3 times [2022-01-31 21:09:44,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:44,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321795587] [2022-01-31 21:09:44,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:44,769 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 21:09:44,820 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:44,821 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:44,883 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:44,933 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 21:09:44,934 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:44,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:44,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:45,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:45,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:45,072 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 21:09:45,262 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:45,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321795587] [2022-01-31 21:09:45,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [321795587] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:45,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:45,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:09:45,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973454734] [2022-01-31 21:09:45,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:45,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:09:45,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:45,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:09:45,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:09:45,264 INFO L87 Difference]: Start difference. First operand 54 states and 66 transitions. Second operand has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:45,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:45,623 INFO L93 Difference]: Finished difference Result 105 states and 128 transitions. [2022-01-31 21:09:45,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:09:45,624 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-01-31 21:09:45,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:45,625 INFO L225 Difference]: With dead ends: 105 [2022-01-31 21:09:45,625 INFO L226 Difference]: Without dead ends: 81 [2022-01-31 21:09:45,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:09:45,626 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 33 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:45,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 106 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:09:45,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-31 21:09:45,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 57. [2022-01-31 21:09:45,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 50 states have internal predecessors, (63), 4 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 21:09:45,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 70 transitions. [2022-01-31 21:09:45,633 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 70 transitions. Word has length 26 [2022-01-31 21:09:45,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:45,633 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 70 transitions. [2022-01-31 21:09:45,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 16 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:45,634 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 70 transitions. [2022-01-31 21:09:45,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-31 21:09:45,634 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:45,634 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:45,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:09:45,634 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:45,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:45,635 INFO L85 PathProgramCache]: Analyzing trace with hash -619739864, now seen corresponding path program 1 times [2022-01-31 21:09:45,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:45,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713804730] [2022-01-31 21:09:45,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:45,650 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 21:09:45,670 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 21:09:45,672 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:45,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:45,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:45,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:45,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:45,709 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 21:09:45,756 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:45,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713804730] [2022-01-31 21:09:45,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1713804730] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:45,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:45,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-01-31 21:09:45,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199423298] [2022-01-31 21:09:45,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:45,757 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 21:09:45,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:45,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 21:09:45,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-01-31 21:09:45,757 INFO L87 Difference]: Start difference. First operand 57 states and 70 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:45,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:45,802 INFO L93 Difference]: Finished difference Result 102 states and 125 transitions. [2022-01-31 21:09:45,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:09:45,802 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-01-31 21:09:45,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:45,803 INFO L225 Difference]: With dead ends: 102 [2022-01-31 21:09:45,803 INFO L226 Difference]: Without dead ends: 71 [2022-01-31 21:09:45,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-01-31 21:09:45,804 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:45,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 37 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:09:45,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-01-31 21:09:45,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2022-01-31 21:09:45,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 53 states have (on average 1.2641509433962264) internal successors, (67), 54 states have internal predecessors, (67), 4 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 21:09:45,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 74 transitions. [2022-01-31 21:09:45,811 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 74 transitions. Word has length 29 [2022-01-31 21:09:45,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:45,812 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 74 transitions. [2022-01-31 21:09:45,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:45,812 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 74 transitions. [2022-01-31 21:09:45,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-31 21:09:45,812 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:45,812 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:45,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:09:45,813 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:45,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:45,813 INFO L85 PathProgramCache]: Analyzing trace with hash 535278948, now seen corresponding path program 4 times [2022-01-31 21:09:45,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:45,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695539485] [2022-01-31 21:09:45,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:45,861 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 21:09:45,907 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:45,908 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:45,944 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 21:09:45,986 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:45,987 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:45,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:45,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:46,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:46,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:46,098 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 21:09:46,326 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:46,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695539485] [2022-01-31 21:09:46,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [695539485] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:46,327 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:46,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:09:46,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832018738] [2022-01-31 21:09:46,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:46,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:09:46,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:46,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:09:46,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:09:46,328 INFO L87 Difference]: Start difference. First operand 61 states and 74 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:46,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:46,733 INFO L93 Difference]: Finished difference Result 114 states and 138 transitions. [2022-01-31 21:09:46,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:09:46,734 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-01-31 21:09:46,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:46,734 INFO L225 Difference]: With dead ends: 114 [2022-01-31 21:09:46,734 INFO L226 Difference]: Without dead ends: 88 [2022-01-31 21:09:46,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=121, Invalid=691, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:09:46,735 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:46,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 76 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:09:46,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-01-31 21:09:46,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2022-01-31 21:09:46,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 56 states have (on average 1.2678571428571428) internal successors, (71), 57 states have internal predecessors, (71), 4 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 21:09:46,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2022-01-31 21:09:46,744 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 29 [2022-01-31 21:09:46,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:46,744 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2022-01-31 21:09:46,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 18 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:46,744 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2022-01-31 21:09:46,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-01-31 21:09:46,745 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:46,745 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:46,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:09:46,745 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:46,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:46,745 INFO L85 PathProgramCache]: Analyzing trace with hash -922933305, now seen corresponding path program 5 times [2022-01-31 21:09:46,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:46,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108371536] [2022-01-31 21:09:46,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:46,824 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:46,879 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 21:09:46,879 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:46,922 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 21:09:46,968 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 21:09:46,968 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:46,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:46,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:47,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:47,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:47,057 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 21:09:47,314 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:47,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108371536] [2022-01-31 21:09:47,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2108371536] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:47,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:47,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:09:47,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658892797] [2022-01-31 21:09:47,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:47,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:09:47,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:47,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:09:47,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:09:47,315 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:47,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:47,740 INFO L93 Difference]: Finished difference Result 118 states and 143 transitions. [2022-01-31 21:09:47,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:09:47,740 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-01-31 21:09:47,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:47,741 INFO L225 Difference]: With dead ends: 118 [2022-01-31 21:09:47,741 INFO L226 Difference]: Without dead ends: 92 [2022-01-31 21:09:47,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=855, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:09:47,742 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 65 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 541 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:47,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 71 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 541 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:09:47,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-01-31 21:09:47,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 67. [2022-01-31 21:09:47,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 59 states have (on average 1.271186440677966) internal successors, (75), 60 states have internal predecessors, (75), 4 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 21:09:47,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 82 transitions. [2022-01-31 21:09:47,752 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 82 transitions. Word has length 32 [2022-01-31 21:09:47,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:47,752 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 82 transitions. [2022-01-31 21:09:47,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 20 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:47,753 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 82 transitions. [2022-01-31 21:09:47,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-01-31 21:09:47,753 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:47,753 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:47,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:09:47,753 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:47,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:47,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1916593726, now seen corresponding path program 1 times [2022-01-31 21:09:47,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:47,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864669640] [2022-01-31 21:09:47,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:47,766 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 21:09:47,766 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:47,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:47,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:47,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:47,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:47,790 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 21:09:47,829 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864669640] [2022-01-31 21:09:47,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [864669640] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:47,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:47,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-01-31 21:09:47,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046296126] [2022-01-31 21:09:47,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:47,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 21:09:47,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:47,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 21:09:47,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-01-31 21:09:47,831 INFO L87 Difference]: Start difference. First operand 67 states and 82 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:47,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:47,903 INFO L93 Difference]: Finished difference Result 131 states and 162 transitions. [2022-01-31 21:09:47,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:09:47,903 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-01-31 21:09:47,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:47,904 INFO L225 Difference]: With dead ends: 131 [2022-01-31 21:09:47,904 INFO L226 Difference]: Without dead ends: 97 [2022-01-31 21:09:47,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-01-31 21:09:47,906 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 18 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:47,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 42 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:47,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-01-31 21:09:47,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 81. [2022-01-31 21:09:47,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 73 states have (on average 1.2465753424657535) internal successors, (91), 74 states have internal predecessors, (91), 4 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 21:09:47,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 98 transitions. [2022-01-31 21:09:47,919 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 98 transitions. Word has length 35 [2022-01-31 21:09:47,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:47,919 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 98 transitions. [2022-01-31 21:09:47,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:47,919 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 98 transitions. [2022-01-31 21:09:47,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-01-31 21:09:47,921 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:47,921 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:47,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:09:47,922 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:47,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:47,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1070036612, now seen corresponding path program 6 times [2022-01-31 21:09:47,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:47,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031641168] [2022-01-31 21:09:47,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:47,961 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 21:09:48,003 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:48,003 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:48,071 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 21:09:48,111 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:48,111 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:48,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:48,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:48,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:48,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:48,215 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 21:09:48,514 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:48,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031641168] [2022-01-31 21:09:48,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1031641168] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:48,514 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:48,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:09:48,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776852634] [2022-01-31 21:09:48,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:48,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:09:48,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:48,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:09:48,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:09:48,515 INFO L87 Difference]: Start difference. First operand 81 states and 98 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:49,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:49,058 INFO L93 Difference]: Finished difference Result 142 states and 171 transitions. [2022-01-31 21:09:49,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:09:49,059 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-01-31 21:09:49,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:49,060 INFO L225 Difference]: With dead ends: 142 [2022-01-31 21:09:49,060 INFO L226 Difference]: Without dead ends: 110 [2022-01-31 21:09:49,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=153, Invalid=1037, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:09:49,061 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 66 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 852 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:49,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 88 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 852 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:09:49,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-01-31 21:09:49,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 84. [2022-01-31 21:09:49,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 76 states have (on average 1.25) internal successors, (95), 77 states have internal predecessors, (95), 4 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 21:09:49,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2022-01-31 21:09:49,071 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 35 [2022-01-31 21:09:49,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:49,071 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2022-01-31 21:09:49,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 22 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:49,071 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2022-01-31 21:09:49,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-01-31 21:09:49,072 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:49,072 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:49,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:09:49,072 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:49,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:49,072 INFO L85 PathProgramCache]: Analyzing trace with hash 8934055, now seen corresponding path program 7 times [2022-01-31 21:09:49,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:49,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624784777] [2022-01-31 21:09:49,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:49,111 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:49,150 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:49,151 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:49,191 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 21:09:49,232 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 21:09:49,232 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:49,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:49,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:49,319 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:49,337 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 21:09:49,661 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:49,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624784777] [2022-01-31 21:09:49,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [624784777] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:49,661 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:49,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:09:49,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542804132] [2022-01-31 21:09:49,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:49,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:09:49,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:49,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:09:49,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:09:49,662 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:50,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:50,278 INFO L93 Difference]: Finished difference Result 146 states and 176 transitions. [2022-01-31 21:09:50,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:09:50,279 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-01-31 21:09:50,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:50,279 INFO L225 Difference]: With dead ends: 146 [2022-01-31 21:09:50,279 INFO L226 Difference]: Without dead ends: 114 [2022-01-31 21:09:50,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:09:50,280 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 69 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:50,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 76 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:09:50,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-01-31 21:09:50,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 87. [2022-01-31 21:09:50,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 80 states have internal predecessors, (99), 4 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 21:09:50,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 106 transitions. [2022-01-31 21:09:50,290 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 106 transitions. Word has length 38 [2022-01-31 21:09:50,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:50,290 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 106 transitions. [2022-01-31 21:09:50,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:50,290 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 106 transitions. [2022-01-31 21:09:50,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-31 21:09:50,291 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:50,291 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:50,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:09:50,291 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:50,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:50,291 INFO L85 PathProgramCache]: Analyzing trace with hash -499938394, now seen corresponding path program 2 times [2022-01-31 21:09:50,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:50,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281810545] [2022-01-31 21:09:50,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:50,303 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 21:09:50,304 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:50,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:50,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:50,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:50,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:50,333 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 21:09:50,387 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:50,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281810545] [2022-01-31 21:09:50,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [281810545] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:50,388 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:50,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-01-31 21:09:50,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999711962] [2022-01-31 21:09:50,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:50,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 21:09:50,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:50,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 21:09:50,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:09:50,389 INFO L87 Difference]: Start difference. First operand 87 states and 106 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:50,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:50,474 INFO L93 Difference]: Finished difference Result 167 states and 205 transitions. [2022-01-31 21:09:50,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:09:50,475 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2022-01-31 21:09:50,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:50,475 INFO L225 Difference]: With dead ends: 167 [2022-01-31 21:09:50,475 INFO L226 Difference]: Without dead ends: 127 [2022-01-31 21:09:50,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:09:50,476 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 28 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:50,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 36 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:50,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-01-31 21:09:50,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 104. [2022-01-31 21:09:50,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 96 states have (on average 1.2291666666666667) internal successors, (118), 97 states have internal predecessors, (118), 4 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 21:09:50,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2022-01-31 21:09:50,499 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 41 [2022-01-31 21:09:50,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:50,499 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2022-01-31 21:09:50,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:50,499 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2022-01-31 21:09:50,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-31 21:09:50,500 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:50,500 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:50,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:09:50,500 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:50,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:50,500 INFO L85 PathProgramCache]: Analyzing trace with hash -338042972, now seen corresponding path program 8 times [2022-01-31 21:09:50,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:50,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774094747] [2022-01-31 21:09:50,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:50,537 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 21:09:50,579 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:50,579 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:50,614 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:50,657 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:50,658 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:50,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:50,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:50,755 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:50,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:50,758 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 21:09:51,347 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:51,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774094747] [2022-01-31 21:09:51,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [774094747] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:51,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:51,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:09:51,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896839251] [2022-01-31 21:09:51,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:51,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:09:51,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:51,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:09:51,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=791, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:09:51,348 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:51,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:51,962 INFO L93 Difference]: Finished difference Result 185 states and 224 transitions. [2022-01-31 21:09:51,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:09:51,963 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-01-31 21:09:51,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:51,964 INFO L225 Difference]: With dead ends: 185 [2022-01-31 21:09:51,964 INFO L226 Difference]: Without dead ends: 147 [2022-01-31 21:09:51,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=1358, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:09:51,964 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 49 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 981 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 981 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:51,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 98 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 981 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:09:51,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-01-31 21:09:51,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 99. [2022-01-31 21:09:51,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 91 states have (on average 1.2417582417582418) internal successors, (113), 92 states have internal predecessors, (113), 4 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 21:09:51,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 120 transitions. [2022-01-31 21:09:51,978 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 120 transitions. Word has length 41 [2022-01-31 21:09:51,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:51,978 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 120 transitions. [2022-01-31 21:09:51,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 26 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:51,979 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 120 transitions. [2022-01-31 21:09:51,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-01-31 21:09:51,979 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:51,979 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:51,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:09:51,979 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:51,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:51,979 INFO L85 PathProgramCache]: Analyzing trace with hash 855627143, now seen corresponding path program 9 times [2022-01-31 21:09:51,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:51,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64795857] [2022-01-31 21:09:51,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:52,027 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:52,076 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 21:09:52,076 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:52,120 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:52,163 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 21:09:52,164 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:52,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:52,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:52,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:52,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:52,284 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 21:09:52,877 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:52,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64795857] [2022-01-31 21:09:52,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [64795857] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:52,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:52,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:09:52,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541314190] [2022-01-31 21:09:52,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:52,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:09:52,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:52,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:09:52,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:09:52,878 INFO L87 Difference]: Start difference. First operand 99 states and 120 transitions. Second operand has 30 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:53,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:53,525 INFO L93 Difference]: Finished difference Result 189 states and 229 transitions. [2022-01-31 21:09:53,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:09:53,526 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-01-31 21:09:53,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:53,526 INFO L225 Difference]: With dead ends: 189 [2022-01-31 21:09:53,526 INFO L226 Difference]: Without dead ends: 151 [2022-01-31 21:09:53,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=222, Invalid=1584, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:09:53,528 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 58 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 970 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:53,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 58 Invalid, 1001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 970 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:09:53,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-01-31 21:09:53,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 102. [2022-01-31 21:09:53,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 94 states have (on average 1.2340425531914894) internal successors, (116), 95 states have internal predecessors, (116), 4 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 21:09:53,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 123 transitions. [2022-01-31 21:09:53,543 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 123 transitions. Word has length 44 [2022-01-31 21:09:53,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:53,543 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 123 transitions. [2022-01-31 21:09:53,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 28 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:53,544 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 123 transitions. [2022-01-31 21:09:53,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-01-31 21:09:53,544 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:53,544 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:53,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:09:53,544 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:53,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:53,544 INFO L85 PathProgramCache]: Analyzing trace with hash 533646915, now seen corresponding path program 10 times [2022-01-31 21:09:53,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:53,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192757266] [2022-01-31 21:09:53,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:53,591 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:53,635 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:53,636 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:53,693 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 21:09:53,732 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:53,732 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:53,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:53,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:53,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:53,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:53,854 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 21:09:54,492 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:54,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192757266] [2022-01-31 21:09:54,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1192757266] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:54,493 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:54,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:09:54,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130303321] [2022-01-31 21:09:54,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:54,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:09:54,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:54,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:09:54,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:09:54,494 INFO L87 Difference]: Start difference. First operand 102 states and 123 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:55,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:55,411 INFO L93 Difference]: Finished difference Result 194 states and 235 transitions. [2022-01-31 21:09:55,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:09:55,411 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-01-31 21:09:55,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:55,412 INFO L225 Difference]: With dead ends: 194 [2022-01-31 21:09:55,412 INFO L226 Difference]: Without dead ends: 156 [2022-01-31 21:09:55,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=249, Invalid=2103, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:09:55,413 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 52 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1269 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 1307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:55,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 111 Invalid, 1307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1269 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:09:55,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-01-31 21:09:55,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 102. [2022-01-31 21:09:55,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 94 states have (on average 1.2446808510638299) internal successors, (117), 95 states have internal predecessors, (117), 4 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 21:09:55,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 124 transitions. [2022-01-31 21:09:55,440 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 124 transitions. Word has length 44 [2022-01-31 21:09:55,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:55,440 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 124 transitions. [2022-01-31 21:09:55,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 29 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:55,441 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 124 transitions. [2022-01-31 21:09:55,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 21:09:55,441 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:55,441 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:55,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:09:55,441 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:55,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:55,441 INFO L85 PathProgramCache]: Analyzing trace with hash -625431166, now seen corresponding path program 3 times [2022-01-31 21:09:55,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:55,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394276539] [2022-01-31 21:09:55,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:55,453 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 21:09:55,453 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:55,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:55,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:55,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:55,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:55,486 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 21:09:55,555 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:55,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394276539] [2022-01-31 21:09:55,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [394276539] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:55,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:55,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:09:55,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636652924] [2022-01-31 21:09:55,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:55,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:09:55,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:55,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:09:55,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:09:55,557 INFO L87 Difference]: Start difference. First operand 102 states and 124 transitions. Second operand has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:55,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:55,639 INFO L93 Difference]: Finished difference Result 201 states and 244 transitions. [2022-01-31 21:09:55,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:09:55,640 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 47 [2022-01-31 21:09:55,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:55,640 INFO L225 Difference]: With dead ends: 201 [2022-01-31 21:09:55,640 INFO L226 Difference]: Without dead ends: 155 [2022-01-31 21:09:55,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:09:55,641 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:55,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 32 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:09:55,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-01-31 21:09:55,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 119. [2022-01-31 21:09:55,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 111 states have (on average 1.2252252252252251) internal successors, (136), 112 states have internal predecessors, (136), 4 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 21:09:55,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2022-01-31 21:09:55,668 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 47 [2022-01-31 21:09:55,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:55,668 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2022-01-31 21:09:55,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 13 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:55,669 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2022-01-31 21:09:55,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 21:09:55,670 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:55,670 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:55,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:09:55,670 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:55,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:55,670 INFO L85 PathProgramCache]: Analyzing trace with hash -847187772, now seen corresponding path program 11 times [2022-01-31 21:09:55,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:55,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592380663] [2022-01-31 21:09:55,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:55,715 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:55,754 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:55,754 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:55,801 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:55,838 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:55,838 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:55,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:55,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:55,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:55,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:55,922 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 21:09:56,421 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:56,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592380663] [2022-01-31 21:09:56,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [592380663] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:56,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:56,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:09:56,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218197573] [2022-01-31 21:09:56,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:56,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:09:56,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:56,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:09:56,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:09:56,422 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand has 32 states, 32 states have (on average 1.34375) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:57,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:57,341 INFO L93 Difference]: Finished difference Result 226 states and 272 transitions. [2022-01-31 21:09:57,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:09:57,341 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.34375) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-01-31 21:09:57,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:57,342 INFO L225 Difference]: With dead ends: 226 [2022-01-31 21:09:57,342 INFO L226 Difference]: Without dead ends: 182 [2022-01-31 21:09:57,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=217, Invalid=1945, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:09:57,343 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 72 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1648 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 1706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:57,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 128 Invalid, 1706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1648 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:09:57,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-01-31 21:09:57,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 133. [2022-01-31 21:09:57,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 125 states have (on average 1.216) internal successors, (152), 126 states have internal predecessors, (152), 4 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 21:09:57,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2022-01-31 21:09:57,383 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 47 [2022-01-31 21:09:57,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:57,384 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2022-01-31 21:09:57,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.34375) internal successors, (43), 30 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:57,384 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2022-01-31 21:09:57,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-01-31 21:09:57,384 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:57,384 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:57,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:09:57,384 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:57,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:57,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1547587481, now seen corresponding path program 12 times [2022-01-31 21:09:57,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:57,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843960215] [2022-01-31 21:09:57,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:57,420 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 21:09:57,455 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 21:09:57,455 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:57,495 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:57,542 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:57,543 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:57,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:57,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:57,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:57,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:57,631 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 21:09:58,174 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:58,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843960215] [2022-01-31 21:09:58,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1843960215] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:58,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:58,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:09:58,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696475194] [2022-01-31 21:09:58,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:58,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:09:58,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:58,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:09:58,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:09:58,175 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:59,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:59,118 INFO L93 Difference]: Finished difference Result 211 states and 251 transitions. [2022-01-31 21:09:59,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:09:59,119 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-01-31 21:09:59,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:59,119 INFO L225 Difference]: With dead ends: 211 [2022-01-31 21:09:59,119 INFO L226 Difference]: Without dead ends: 167 [2022-01-31 21:09:59,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=233, Invalid=2217, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:09:59,120 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 91 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 1584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:59,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 91 Invalid, 1584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:09:59,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-01-31 21:09:59,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 136. [2022-01-31 21:09:59,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 128 states have (on average 1.21875) internal successors, (156), 129 states have internal predecessors, (156), 4 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 21:09:59,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 163 transitions. [2022-01-31 21:09:59,152 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 163 transitions. Word has length 50 [2022-01-31 21:09:59,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:59,152 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 163 transitions. [2022-01-31 21:09:59,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 32 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:09:59,152 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 163 transitions. [2022-01-31 21:09:59,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:09:59,152 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:59,152 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:59,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:09:59,153 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:59,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:59,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1512846234, now seen corresponding path program 4 times [2022-01-31 21:09:59,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:59,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364223984] [2022-01-31 21:09:59,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:59,170 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:59,170 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:09:59,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:59,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:59,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:59,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:59,212 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 21:09:59,303 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:09:59,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364223984] [2022-01-31 21:09:59,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [364223984] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:09:59,303 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:09:59,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:09:59,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487904040] [2022-01-31 21:09:59,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:09:59,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:09:59,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:09:59,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:09:59,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:09:59,304 INFO L87 Difference]: Start difference. First operand 136 states and 163 transitions. Second operand has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:59,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:09:59,445 INFO L93 Difference]: Finished difference Result 244 states and 294 transitions. [2022-01-31 21:09:59,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:09:59,446 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 53 [2022-01-31 21:09:59,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:09:59,447 INFO L225 Difference]: With dead ends: 244 [2022-01-31 21:09:59,447 INFO L226 Difference]: Without dead ends: 192 [2022-01-31 21:09:59,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:09:59,448 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 34 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:09:59,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 48 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:09:59,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-01-31 21:09:59,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 159. [2022-01-31 21:09:59,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 151 states have (on average 1.1986754966887416) internal successors, (181), 152 states have internal predecessors, (181), 4 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 21:09:59,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 188 transitions. [2022-01-31 21:09:59,491 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 188 transitions. Word has length 53 [2022-01-31 21:09:59,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:09:59,491 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 188 transitions. [2022-01-31 21:09:59,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:09:59,492 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 188 transitions. [2022-01-31 21:09:59,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:09:59,492 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:09:59,492 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:09:59,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:09:59,492 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:09:59,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:09:59,492 INFO L85 PathProgramCache]: Analyzing trace with hash 2090772964, now seen corresponding path program 13 times [2022-01-31 21:09:59,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:09:59,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422696015] [2022-01-31 21:09:59,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:09:59,527 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 21:09:59,564 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 21:09:59,564 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:59,617 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:59,662 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:09:59,662 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:09:59,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:09:59,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:59,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:09:59,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:09:59,753 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 21:10:00,527 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:00,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422696015] [2022-01-31 21:10:00,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [422696015] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:00,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:00,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:10:00,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688813264] [2022-01-31 21:10:00,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:00,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:10:00,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:00,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:10:00,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1299, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:10:00,529 INFO L87 Difference]: Start difference. First operand 159 states and 188 transitions. Second operand has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:01,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:01,525 INFO L93 Difference]: Finished difference Result 260 states and 311 transitions. [2022-01-31 21:10:01,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:10:01,531 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-01-31 21:10:01,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:01,532 INFO L225 Difference]: With dead ends: 260 [2022-01-31 21:10:01,532 INFO L226 Difference]: Without dead ends: 210 [2022-01-31 21:10:01,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=262, Invalid=2188, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:10:01,533 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 57 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 1823 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:01,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 108 Invalid, 1856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1823 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:10:01,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-01-31 21:10:01,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 148. [2022-01-31 21:10:01,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 140 states have (on average 1.2142857142857142) internal successors, (170), 141 states have internal predecessors, (170), 4 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 21:10:01,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 177 transitions. [2022-01-31 21:10:01,567 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 177 transitions. Word has length 53 [2022-01-31 21:10:01,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:01,567 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 177 transitions. [2022-01-31 21:10:01,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:01,567 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 177 transitions. [2022-01-31 21:10:01,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-01-31 21:10:01,568 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:01,568 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:01,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:10:01,568 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:01,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:01,568 INFO L85 PathProgramCache]: Analyzing trace with hash 397140807, now seen corresponding path program 14 times [2022-01-31 21:10:01,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:01,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139618156] [2022-01-31 21:10:01,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:01,603 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 21:10:01,641 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:01,641 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:01,680 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:01,716 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:01,717 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:01,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:01,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:01,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:01,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:01,810 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 21:10:02,446 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:02,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139618156] [2022-01-31 21:10:02,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1139618156] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:02,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:02,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:10:02,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771466681] [2022-01-31 21:10:02,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:02,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:10:02,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:02,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:10:02,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1330, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:10:02,447 INFO L87 Difference]: Start difference. First operand 148 states and 177 transitions. Second operand has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:03,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:03,657 INFO L93 Difference]: Finished difference Result 273 states and 327 transitions. [2022-01-31 21:10:03,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:10:03,658 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2022-01-31 21:10:03,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:03,659 INFO L225 Difference]: With dead ends: 273 [2022-01-31 21:10:03,659 INFO L226 Difference]: Without dead ends: 223 [2022-01-31 21:10:03,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=265, Invalid=2815, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:10:03,660 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 97 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 2204 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 2275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:03,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 121 Invalid, 2275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2204 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:10:03,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-01-31 21:10:03,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 165. [2022-01-31 21:10:03,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 157 states have (on average 1.2038216560509554) internal successors, (189), 158 states have internal predecessors, (189), 4 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 21:10:03,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 196 transitions. [2022-01-31 21:10:03,703 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 196 transitions. Word has length 56 [2022-01-31 21:10:03,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:03,703 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 196 transitions. [2022-01-31 21:10:03,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 36 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:03,703 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 196 transitions. [2022-01-31 21:10:03,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:10:03,703 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:03,703 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:03,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:10:03,704 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:03,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:03,704 INFO L85 PathProgramCache]: Analyzing trace with hash -34619070, now seen corresponding path program 5 times [2022-01-31 21:10:03,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:03,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047302919] [2022-01-31 21:10:03,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:03,717 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 21:10:03,717 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:03,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:03,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:03,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:03,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:03,757 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 21:10:03,859 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:03,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047302919] [2022-01-31 21:10:03,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2047302919] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:03,859 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:03,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:10:03,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181073475] [2022-01-31 21:10:03,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:03,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:10:03,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:03,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:10:03,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:10:03,860 INFO L87 Difference]: Start difference. First operand 165 states and 196 transitions. Second operand has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 17 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:04,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:04,027 INFO L93 Difference]: Finished difference Result 287 states and 343 transitions. [2022-01-31 21:10:04,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:10:04,028 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 17 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 59 [2022-01-31 21:10:04,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:04,029 INFO L225 Difference]: With dead ends: 287 [2022-01-31 21:10:04,029 INFO L226 Difference]: Without dead ends: 229 [2022-01-31 21:10:04,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 22 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:10:04,030 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 44 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:04,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 42 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:04,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-01-31 21:10:04,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 191. [2022-01-31 21:10:04,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 183 states have (on average 1.185792349726776) internal successors, (217), 184 states have internal predecessors, (217), 4 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 21:10:04,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 224 transitions. [2022-01-31 21:10:04,080 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 224 transitions. Word has length 59 [2022-01-31 21:10:04,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:04,081 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 224 transitions. [2022-01-31 21:10:04,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 17 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:04,081 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 224 transitions. [2022-01-31 21:10:04,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:10:04,081 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:04,081 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:04,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:10:04,081 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:04,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:04,082 INFO L85 PathProgramCache]: Analyzing trace with hash -1617622268, now seen corresponding path program 15 times [2022-01-31 21:10:04,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:04,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039418888] [2022-01-31 21:10:04,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:04,132 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:04,171 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:04,172 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:04,216 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:04,263 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:04,263 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:04,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:04,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:04,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:04,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:04,344 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 21:10:05,029 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:05,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039418888] [2022-01-31 21:10:05,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2039418888] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:05,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:05,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:10:05,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464543590] [2022-01-31 21:10:05,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:05,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:10:05,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:05,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:10:05,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1479, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:10:05,031 INFO L87 Difference]: Start difference. First operand 191 states and 224 transitions. Second operand has 40 states, 40 states have (on average 1.375) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:06,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:06,323 INFO L93 Difference]: Finished difference Result 284 states and 333 transitions. [2022-01-31 21:10:06,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-01-31 21:10:06,324 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2022-01-31 21:10:06,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:06,325 INFO L225 Difference]: With dead ends: 284 [2022-01-31 21:10:06,325 INFO L226 Difference]: Without dead ends: 228 [2022-01-31 21:10:06,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=281, Invalid=3141, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:10:06,327 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 114 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 2443 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 2517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 2443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:06,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 106 Invalid, 2517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 2443 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:10:06,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-01-31 21:10:06,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 194. [2022-01-31 21:10:06,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 186 states have (on average 1.1881720430107527) internal successors, (221), 187 states have internal predecessors, (221), 4 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 21:10:06,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 228 transitions. [2022-01-31 21:10:06,387 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 228 transitions. Word has length 59 [2022-01-31 21:10:06,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:06,387 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 228 transitions. [2022-01-31 21:10:06,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 38 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:06,388 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 228 transitions. [2022-01-31 21:10:06,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-01-31 21:10:06,389 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:06,389 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:06,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:10:06,389 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:06,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:06,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1256427993, now seen corresponding path program 16 times [2022-01-31 21:10:06,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:06,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372150382] [2022-01-31 21:10:06,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:06,441 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:06,479 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:06,480 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:06,525 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 21:10:06,560 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 21:10:06,561 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:06,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:06,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:06,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:06,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:06,666 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 21:10:07,669 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:07,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372150382] [2022-01-31 21:10:07,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [372150382] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:07,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:07,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:10:07,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056263865] [2022-01-31 21:10:07,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:07,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:10:07,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:07,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:10:07,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1797, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:10:07,670 INFO L87 Difference]: Start difference. First operand 194 states and 228 transitions. Second operand has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:08,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:08,912 INFO L93 Difference]: Finished difference Result 314 states and 373 transitions. [2022-01-31 21:10:08,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:10:08,912 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2022-01-31 21:10:08,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:08,913 INFO L225 Difference]: With dead ends: 314 [2022-01-31 21:10:08,913 INFO L226 Difference]: Without dead ends: 258 [2022-01-31 21:10:08,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=283, Invalid=3139, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:10:08,914 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 73 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 1980 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 2024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:08,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 72 Invalid, 2024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1980 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:10:08,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-01-31 21:10:08,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 180. [2022-01-31 21:10:08,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 172 states have (on average 1.2034883720930232) internal successors, (207), 173 states have internal predecessors, (207), 4 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 21:10:08,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 214 transitions. [2022-01-31 21:10:08,965 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 214 transitions. Word has length 62 [2022-01-31 21:10:08,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:08,965 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 214 transitions. [2022-01-31 21:10:08,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.380952380952381) internal successors, (58), 40 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:08,966 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 214 transitions. [2022-01-31 21:10:08,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:10:08,966 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:08,966 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:08,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:10:08,966 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:08,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:08,966 INFO L85 PathProgramCache]: Analyzing trace with hash 696503590, now seen corresponding path program 6 times [2022-01-31 21:10:08,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:08,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560399971] [2022-01-31 21:10:08,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:08,982 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:08,982 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:08,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:08,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:09,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:09,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:09,028 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 21:10:09,143 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:09,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560399971] [2022-01-31 21:10:09,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [560399971] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:09,144 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:09,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:10:09,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837757749] [2022-01-31 21:10:09,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:09,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:10:09,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:09,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:10:09,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:10:09,145 INFO L87 Difference]: Start difference. First operand 180 states and 214 transitions. Second operand has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:09,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:09,325 INFO L93 Difference]: Finished difference Result 330 states and 391 transitions. [2022-01-31 21:10:09,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:10:09,326 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 65 [2022-01-31 21:10:09,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:09,326 INFO L225 Difference]: With dead ends: 330 [2022-01-31 21:10:09,326 INFO L226 Difference]: Without dead ends: 266 [2022-01-31 21:10:09,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 24 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:10:09,327 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 49 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:09,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 38 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:09,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2022-01-31 21:10:09,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 206. [2022-01-31 21:10:09,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 198 states have (on average 1.1868686868686869) internal successors, (235), 199 states have internal predecessors, (235), 4 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 21:10:09,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 242 transitions. [2022-01-31 21:10:09,388 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 242 transitions. Word has length 65 [2022-01-31 21:10:09,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:09,388 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 242 transitions. [2022-01-31 21:10:09,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:09,388 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 242 transitions. [2022-01-31 21:10:09,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:10:09,388 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:09,388 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:09,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:10:09,389 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:09,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:09,389 INFO L85 PathProgramCache]: Analyzing trace with hash 189142052, now seen corresponding path program 17 times [2022-01-31 21:10:09,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:09,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549609170] [2022-01-31 21:10:09,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:09,434 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:09,479 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:09,479 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:09,523 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 21:10:09,560 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 21:10:09,561 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:09,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:09,659 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:09,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:09,661 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 21:10:10,731 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:10,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549609170] [2022-01-31 21:10:10,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1549609170] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:10,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:10,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:10:10,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065331843] [2022-01-31 21:10:10,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:10,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:10:10,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:10,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:10:10,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1935, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:10:10,735 INFO L87 Difference]: Start difference. First operand 206 states and 242 transitions. Second operand has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:12,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:12,023 INFO L93 Difference]: Finished difference Result 344 states and 406 transitions. [2022-01-31 21:10:12,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:10:12,023 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-01-31 21:10:12,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:12,024 INFO L225 Difference]: With dead ends: 344 [2022-01-31 21:10:12,024 INFO L226 Difference]: Without dead ends: 282 [2022-01-31 21:10:12,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=322, Invalid=3218, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:10:12,025 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 71 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 2240 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 2280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 2240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:12,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 83 Invalid, 2280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 2240 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:10:12,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-01-31 21:10:12,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 209. [2022-01-31 21:10:12,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 201 states have (on average 1.1840796019900497) internal successors, (238), 202 states have internal predecessors, (238), 4 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 21:10:12,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 245 transitions. [2022-01-31 21:10:12,112 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 245 transitions. Word has length 65 [2022-01-31 21:10:12,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:12,113 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 245 transitions. [2022-01-31 21:10:12,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:12,113 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 245 transitions. [2022-01-31 21:10:12,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:10:12,113 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:12,113 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:12,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:10:12,114 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:12,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:12,114 INFO L85 PathProgramCache]: Analyzing trace with hash 574040296, now seen corresponding path program 18 times [2022-01-31 21:10:12,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:12,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156768474] [2022-01-31 21:10:12,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:12,147 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:12,184 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:12,184 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:12,216 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:12,267 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:12,267 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:12,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:12,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:12,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:12,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:12,364 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 21:10:13,457 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:13,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156768474] [2022-01-31 21:10:13,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1156768474] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:13,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:13,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:10:13,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241123615] [2022-01-31 21:10:13,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:13,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:10:13,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:13,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:10:13,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=2016, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:10:13,459 INFO L87 Difference]: Start difference. First operand 209 states and 245 transitions. Second operand has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:15,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:15,307 INFO L93 Difference]: Finished difference Result 353 states and 416 transitions. [2022-01-31 21:10:15,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-01-31 21:10:15,308 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-01-31 21:10:15,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:15,308 INFO L225 Difference]: With dead ends: 353 [2022-01-31 21:10:15,308 INFO L226 Difference]: Without dead ends: 291 [2022-01-31 21:10:15,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1257 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=402, Invalid=4290, Unknown=0, NotChecked=0, Total=4692 [2022-01-31 21:10:15,310 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 72 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 3342 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 3400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 3342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:15,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 201 Invalid, 3400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 3342 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:10:15,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2022-01-31 21:10:15,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 209. [2022-01-31 21:10:15,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 201 states have (on average 1.1890547263681592) internal successors, (239), 202 states have internal predecessors, (239), 4 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 21:10:15,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 246 transitions. [2022-01-31 21:10:15,383 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 246 transitions. Word has length 65 [2022-01-31 21:10:15,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:15,383 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 246 transitions. [2022-01-31 21:10:15,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.3555555555555556) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:15,383 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 246 transitions. [2022-01-31 21:10:15,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-01-31 21:10:15,384 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:15,384 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:15,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:10:15,384 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:15,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:15,384 INFO L85 PathProgramCache]: Analyzing trace with hash -470724345, now seen corresponding path program 19 times [2022-01-31 21:10:15,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:15,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292576260] [2022-01-31 21:10:15,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:15,426 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 21:10:15,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:15,460 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:15,503 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 21:10:15,539 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:15,540 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:15,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:15,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:15,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:15,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:15,637 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 21:10:16,502 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:16,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292576260] [2022-01-31 21:10:16,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [292576260] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:16,502 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:16,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:10:16,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463942427] [2022-01-31 21:10:16,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:16,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:10:16,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:16,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:10:16,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1973, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:10:16,503 INFO L87 Difference]: Start difference. First operand 209 states and 246 transitions. Second operand has 46 states, 46 states have (on average 1.391304347826087) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:18,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:18,317 INFO L93 Difference]: Finished difference Result 362 states and 428 transitions. [2022-01-31 21:10:18,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-01-31 21:10:18,318 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.391304347826087) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2022-01-31 21:10:18,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:18,319 INFO L225 Difference]: With dead ends: 362 [2022-01-31 21:10:18,319 INFO L226 Difference]: Without dead ends: 300 [2022-01-31 21:10:18,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=330, Invalid=4226, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:10:18,320 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 89 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 3718 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 3804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 3718 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:18,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 193 Invalid, 3804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 3718 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:10:18,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2022-01-31 21:10:18,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 232. [2022-01-31 21:10:18,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 224 states have (on average 1.1785714285714286) internal successors, (264), 225 states have internal predecessors, (264), 4 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 21:10:18,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 271 transitions. [2022-01-31 21:10:18,418 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 271 transitions. Word has length 68 [2022-01-31 21:10:18,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:18,418 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 271 transitions. [2022-01-31 21:10:18,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.391304347826087) internal successors, (64), 44 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:18,419 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 271 transitions. [2022-01-31 21:10:18,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-31 21:10:18,419 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:18,419 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:18,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:10:18,419 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:18,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:18,420 INFO L85 PathProgramCache]: Analyzing trace with hash 332420354, now seen corresponding path program 7 times [2022-01-31 21:10:18,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:18,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808232030] [2022-01-31 21:10:18,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:18,439 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:18,439 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:18,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:18,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:18,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:18,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:18,508 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 21:10:18,651 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:18,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808232030] [2022-01-31 21:10:18,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [808232030] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:18,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:18,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:10:18,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078851090] [2022-01-31 21:10:18,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:18,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:10:18,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:18,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:10:18,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:10:18,652 INFO L87 Difference]: Start difference. First operand 232 states and 271 transitions. Second operand has 22 states, 22 states have (on average 2.8636363636363638) internal successors, (63), 21 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:18,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:18,914 INFO L93 Difference]: Finished difference Result 382 states and 450 transitions. [2022-01-31 21:10:18,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:10:18,915 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.8636363636363638) internal successors, (63), 21 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 71 [2022-01-31 21:10:18,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:18,916 INFO L225 Difference]: With dead ends: 382 [2022-01-31 21:10:18,916 INFO L226 Difference]: Without dead ends: 312 [2022-01-31 21:10:18,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 25 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:10:18,916 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 58 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:18,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 42 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:18,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2022-01-31 21:10:19,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 264. [2022-01-31 21:10:19,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 256 states have (on average 1.1640625) internal successors, (298), 257 states have internal predecessors, (298), 4 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 21:10:19,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 305 transitions. [2022-01-31 21:10:19,022 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 305 transitions. Word has length 71 [2022-01-31 21:10:19,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:19,022 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 305 transitions. [2022-01-31 21:10:19,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.8636363636363638) internal successors, (63), 21 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:19,022 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 305 transitions. [2022-01-31 21:10:19,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-31 21:10:19,023 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:19,023 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:19,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:10:19,023 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:19,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:19,023 INFO L85 PathProgramCache]: Analyzing trace with hash -485243580, now seen corresponding path program 20 times [2022-01-31 21:10:19,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:19,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622509341] [2022-01-31 21:10:19,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:19,068 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 21:10:19,101 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 21:10:19,101 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:19,133 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:19,168 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 21:10:19,168 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:19,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:19,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:19,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:19,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:19,260 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 21:10:20,183 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:20,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622509341] [2022-01-31 21:10:20,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [622509341] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:20,183 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:20,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:10:20,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516211073] [2022-01-31 21:10:20,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:20,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:10:20,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:20,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:10:20,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2155, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:10:20,184 INFO L87 Difference]: Start difference. First operand 264 states and 305 transitions. Second operand has 48 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:22,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:22,186 INFO L93 Difference]: Finished difference Result 373 states and 432 transitions. [2022-01-31 21:10:22,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-01-31 21:10:22,186 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2022-01-31 21:10:22,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:22,187 INFO L225 Difference]: With dead ends: 373 [2022-01-31 21:10:22,187 INFO L226 Difference]: Without dead ends: 305 [2022-01-31 21:10:22,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1156 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=345, Invalid=4625, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:10:22,188 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 132 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 4109 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 4197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 4109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:22,188 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 143 Invalid, 4197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 4109 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:10:22,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-01-31 21:10:22,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 267. [2022-01-31 21:10:22,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 259 states have (on average 1.166023166023166) internal successors, (302), 260 states have internal predecessors, (302), 4 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 21:10:22,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 309 transitions. [2022-01-31 21:10:22,303 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 309 transitions. Word has length 71 [2022-01-31 21:10:22,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:22,303 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 309 transitions. [2022-01-31 21:10:22,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.3958333333333333) internal successors, (67), 46 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:22,304 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 309 transitions. [2022-01-31 21:10:22,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-01-31 21:10:22,304 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:22,304 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:22,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:10:22,304 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:22,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:22,305 INFO L85 PathProgramCache]: Analyzing trace with hash 763923431, now seen corresponding path program 21 times [2022-01-31 21:10:22,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:22,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259310074] [2022-01-31 21:10:22,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:22,351 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:22,391 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:22,391 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:22,437 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 21:10:22,477 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:22,477 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:22,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:22,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:22,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:22,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:22,582 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 21:10:23,580 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:23,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259310074] [2022-01-31 21:10:23,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1259310074] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:23,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:23,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:10:23,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47671818] [2022-01-31 21:10:23,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:23,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:10:23,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:23,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:10:23,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=2343, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:10:23,581 INFO L87 Difference]: Start difference. First operand 267 states and 309 transitions. Second operand has 50 states, 50 states have (on average 1.4) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:25,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:25,507 INFO L93 Difference]: Finished difference Result 377 states and 437 transitions. [2022-01-31 21:10:25,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-01-31 21:10:25,508 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.4) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2022-01-31 21:10:25,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:25,509 INFO L225 Difference]: With dead ends: 377 [2022-01-31 21:10:25,509 INFO L226 Difference]: Without dead ends: 309 [2022-01-31 21:10:25,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=362, Invalid=5040, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:10:25,510 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 148 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 3754 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 3849 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 3754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:25,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 96 Invalid, 3849 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 3754 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:10:25,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2022-01-31 21:10:25,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 270. [2022-01-31 21:10:25,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 262 states have (on average 1.16793893129771) internal successors, (306), 263 states have internal predecessors, (306), 4 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 21:10:25,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 313 transitions. [2022-01-31 21:10:25,623 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 313 transitions. Word has length 74 [2022-01-31 21:10:25,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:25,623 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 313 transitions. [2022-01-31 21:10:25,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.4) internal successors, (70), 48 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:25,623 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 313 transitions. [2022-01-31 21:10:25,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:10:25,624 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:25,624 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:25,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:10:25,627 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:25,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:25,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1073450470, now seen corresponding path program 8 times [2022-01-31 21:10:25,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:25,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339162117] [2022-01-31 21:10:25,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:25,650 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 21:10:25,651 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:25,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:25,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:25,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:25,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:25,717 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 21:10:25,882 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:25,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339162117] [2022-01-31 21:10:25,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [339162117] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:25,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:25,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:10:25,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382437134] [2022-01-31 21:10:25,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:25,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:10:25,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:25,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:10:25,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:10:25,883 INFO L87 Difference]: Start difference. First operand 270 states and 313 transitions. Second operand has 24 states, 24 states have (on average 2.875) internal successors, (69), 23 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:26,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:26,203 INFO L93 Difference]: Finished difference Result 434 states and 508 transitions. [2022-01-31 21:10:26,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:10:26,203 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.875) internal successors, (69), 23 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2022-01-31 21:10:26,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:26,204 INFO L225 Difference]: With dead ends: 434 [2022-01-31 21:10:26,204 INFO L226 Difference]: Without dead ends: 358 [2022-01-31 21:10:26,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 24 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:10:26,204 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 68 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:26,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 58 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:26,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-01-31 21:10:26,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 305. [2022-01-31 21:10:26,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 297 states have (on average 1.1548821548821548) internal successors, (343), 298 states have internal predecessors, (343), 4 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 21:10:26,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 350 transitions. [2022-01-31 21:10:26,337 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 350 transitions. Word has length 77 [2022-01-31 21:10:26,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:26,338 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 350 transitions. [2022-01-31 21:10:26,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.875) internal successors, (69), 23 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:26,338 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 350 transitions. [2022-01-31 21:10:26,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:10:26,338 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:26,338 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:26,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:10:26,339 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:26,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:26,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1193271708, now seen corresponding path program 22 times [2022-01-31 21:10:26,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:26,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928953130] [2022-01-31 21:10:26,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:26,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:26,423 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 21:10:26,423 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:26,467 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:26,502 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 21:10:26,502 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:26,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:26,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:26,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:26,619 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 21:10:28,015 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:28,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928953130] [2022-01-31 21:10:28,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1928953130] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:28,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:28,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:10:28,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877940831] [2022-01-31 21:10:28,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:28,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:10:28,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:28,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:10:28,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=2699, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:10:28,017 INFO L87 Difference]: Start difference. First operand 305 states and 350 transitions. Second operand has 52 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:29,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:29,851 INFO L93 Difference]: Finished difference Result 446 states and 521 transitions. [2022-01-31 21:10:29,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-01-31 21:10:29,851 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-01-31 21:10:29,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:29,852 INFO L225 Difference]: With dead ends: 446 [2022-01-31 21:10:29,852 INFO L226 Difference]: Without dead ends: 372 [2022-01-31 21:10:29,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1223 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=382, Invalid=4448, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:10:29,853 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 78 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 3686 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 3731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 3686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:29,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 163 Invalid, 3731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 3686 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:10:29,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2022-01-31 21:10:29,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 282. [2022-01-31 21:10:29,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 274 states have (on average 1.167883211678832) internal successors, (320), 275 states have internal predecessors, (320), 4 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 21:10:29,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 327 transitions. [2022-01-31 21:10:29,983 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 327 transitions. Word has length 77 [2022-01-31 21:10:29,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:29,983 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 327 transitions. [2022-01-31 21:10:29,983 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 50 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:29,983 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 327 transitions. [2022-01-31 21:10:29,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-01-31 21:10:29,983 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:29,984 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:29,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:10:29,984 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:29,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:29,984 INFO L85 PathProgramCache]: Analyzing trace with hash 482352839, now seen corresponding path program 23 times [2022-01-31 21:10:29,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:29,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460703793] [2022-01-31 21:10:29,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:30,029 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 21:10:30,065 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:30,066 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:30,098 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:30,151 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 21:10:30,151 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:30,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:30,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:30,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:30,223 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 21:10:31,389 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:31,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460703793] [2022-01-31 21:10:31,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [460703793] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:31,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:31,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-01-31 21:10:31,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919126085] [2022-01-31 21:10:31,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:31,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-01-31 21:10:31,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:31,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-01-31 21:10:31,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2746, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:10:31,390 INFO L87 Difference]: Start difference. First operand 282 states and 327 transitions. Second operand has 54 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:33,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:33,504 INFO L93 Difference]: Finished difference Result 463 states and 541 transitions. [2022-01-31 21:10:33,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-01-31 21:10:33,504 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2022-01-31 21:10:33,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:33,505 INFO L225 Difference]: With dead ends: 463 [2022-01-31 21:10:33,505 INFO L226 Difference]: Without dead ends: 389 [2022-01-31 21:10:33,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1498 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=393, Invalid=5927, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 21:10:33,506 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 163 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 3901 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 4004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 3901 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:33,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 64 Invalid, 4004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 3901 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:10:33,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-01-31 21:10:33,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 311. [2022-01-31 21:10:33,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 303 states have (on average 1.1584158415841583) internal successors, (351), 304 states have internal predecessors, (351), 4 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 21:10:33,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 358 transitions. [2022-01-31 21:10:33,663 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 358 transitions. Word has length 80 [2022-01-31 21:10:33,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:33,663 INFO L470 AbstractCegarLoop]: Abstraction has 311 states and 358 transitions. [2022-01-31 21:10:33,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.4074074074074074) internal successors, (76), 52 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:33,664 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 358 transitions. [2022-01-31 21:10:33,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-01-31 21:10:33,664 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:33,664 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:33,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:10:33,665 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:33,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:33,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1052928194, now seen corresponding path program 9 times [2022-01-31 21:10:33,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:33,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273311639] [2022-01-31 21:10:33,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:33,683 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:33,683 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:33,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:33,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:33,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:33,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:33,751 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 21:10:33,944 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:33,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273311639] [2022-01-31 21:10:33,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1273311639] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:33,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:33,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:10:33,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785031210] [2022-01-31 21:10:33,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:33,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:10:33,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:33,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:10:33,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:10:33,945 INFO L87 Difference]: Start difference. First operand 311 states and 358 transitions. Second operand has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:34,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:34,315 INFO L93 Difference]: Finished difference Result 489 states and 569 transitions. [2022-01-31 21:10:34,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:10:34,316 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 83 [2022-01-31 21:10:34,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:34,317 INFO L225 Difference]: With dead ends: 489 [2022-01-31 21:10:34,317 INFO L226 Difference]: Without dead ends: 407 [2022-01-31 21:10:34,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:10:34,318 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 71 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:34,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 47 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:34,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-01-31 21:10:34,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 349. [2022-01-31 21:10:34,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 341 states have (on average 1.1466275659824048) internal successors, (391), 342 states have internal predecessors, (391), 4 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 21:10:34,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 398 transitions. [2022-01-31 21:10:34,498 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 398 transitions. Word has length 83 [2022-01-31 21:10:34,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:34,498 INFO L470 AbstractCegarLoop]: Abstraction has 349 states and 398 transitions. [2022-01-31 21:10:34,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:34,498 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 398 transitions. [2022-01-31 21:10:34,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-01-31 21:10:34,499 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:34,499 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:34,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:10:34,499 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:34,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:34,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1391648892, now seen corresponding path program 24 times [2022-01-31 21:10:34,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:34,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1041336794] [2022-01-31 21:10:34,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:34,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:34,579 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:34,580 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:34,623 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:34,661 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 21:10:34,661 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:34,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:34,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:34,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:34,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:34,743 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 21:10:36,337 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:36,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1041336794] [2022-01-31 21:10:36,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1041336794] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:36,337 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:36,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-01-31 21:10:36,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654881127] [2022-01-31 21:10:36,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:36,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-01-31 21:10:36,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:36,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-01-31 21:10:36,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=3066, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:10:36,338 INFO L87 Difference]: Start difference. First operand 349 states and 398 transitions. Second operand has 56 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:38,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:38,484 INFO L93 Difference]: Finished difference Result 500 states and 581 transitions. [2022-01-31 21:10:38,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-01-31 21:10:38,485 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2022-01-31 21:10:38,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:38,486 INFO L225 Difference]: With dead ends: 500 [2022-01-31 21:10:38,486 INFO L226 Difference]: Without dead ends: 420 [2022-01-31 21:10:38,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1301 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=346, Invalid=5056, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:10:38,487 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 84 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 4374 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 4422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 4374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:38,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 173 Invalid, 4422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 4374 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:10:38,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2022-01-31 21:10:38,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 323. [2022-01-31 21:10:38,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 315 states have (on average 1.1587301587301588) internal successors, (365), 316 states have internal predecessors, (365), 4 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 21:10:38,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 372 transitions. [2022-01-31 21:10:38,651 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 372 transitions. Word has length 83 [2022-01-31 21:10:38,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:38,651 INFO L470 AbstractCegarLoop]: Abstraction has 323 states and 372 transitions. [2022-01-31 21:10:38,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.4107142857142858) internal successors, (79), 54 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:38,651 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 372 transitions. [2022-01-31 21:10:38,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-01-31 21:10:38,652 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:38,652 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:38,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:10:38,652 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:38,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:38,652 INFO L85 PathProgramCache]: Analyzing trace with hash 502663591, now seen corresponding path program 25 times [2022-01-31 21:10:38,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:38,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716299486] [2022-01-31 21:10:38,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:38,697 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:38,744 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:38,745 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:38,794 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:38,832 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 21:10:38,832 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:38,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:38,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:38,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:38,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:38,924 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 21:10:40,589 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:40,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716299486] [2022-01-31 21:10:40,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1716299486] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:40,589 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:40,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-01-31 21:10:40,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056055267] [2022-01-31 21:10:40,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:40,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-01-31 21:10:40,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:40,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-01-31 21:10:40,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3356, Unknown=0, NotChecked=0, Total=3660 [2022-01-31 21:10:40,591 INFO L87 Difference]: Start difference. First operand 323 states and 372 transitions. Second operand has 58 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:42,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:42,843 INFO L93 Difference]: Finished difference Result 504 states and 586 transitions. [2022-01-31 21:10:42,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-01-31 21:10:42,843 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2022-01-31 21:10:42,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:42,844 INFO L225 Difference]: With dead ends: 504 [2022-01-31 21:10:42,844 INFO L226 Difference]: Without dead ends: 424 [2022-01-31 21:10:42,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1527 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=431, Invalid=5575, Unknown=0, NotChecked=0, Total=6006 [2022-01-31 21:10:42,845 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 88 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 4351 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 4402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 4351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:42,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 163 Invalid, 4402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 4351 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:10:42,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2022-01-31 21:10:43,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 326. [2022-01-31 21:10:43,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 318 states have (on average 1.1572327044025157) internal successors, (368), 319 states have internal predecessors, (368), 4 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 21:10:43,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 375 transitions. [2022-01-31 21:10:43,032 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 375 transitions. Word has length 86 [2022-01-31 21:10:43,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:43,033 INFO L470 AbstractCegarLoop]: Abstraction has 326 states and 375 transitions. [2022-01-31 21:10:43,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.4137931034482758) internal successors, (82), 56 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:43,033 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 375 transitions. [2022-01-31 21:10:43,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-01-31 21:10:43,033 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:43,033 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:43,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:10:43,034 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:43,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:43,034 INFO L85 PathProgramCache]: Analyzing trace with hash -392407197, now seen corresponding path program 26 times [2022-01-31 21:10:43,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:43,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962051003] [2022-01-31 21:10:43,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:43,092 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:43,129 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:43,129 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:43,161 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:43,197 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:43,198 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:43,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:43,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:43,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:43,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:43,278 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 21:10:44,610 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:44,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962051003] [2022-01-31 21:10:44,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [962051003] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:44,610 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:44,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-01-31 21:10:44,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937102356] [2022-01-31 21:10:44,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:44,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-01-31 21:10:44,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:44,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-01-31 21:10:44,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=3286, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:10:44,611 INFO L87 Difference]: Start difference. First operand 326 states and 375 transitions. Second operand has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:47,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:47,278 INFO L93 Difference]: Finished difference Result 520 states and 604 transitions. [2022-01-31 21:10:47,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-01-31 21:10:47,279 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2022-01-31 21:10:47,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:47,280 INFO L225 Difference]: With dead ends: 520 [2022-01-31 21:10:47,280 INFO L226 Difference]: Without dead ends: 440 [2022-01-31 21:10:47,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=477, Invalid=7355, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:10:47,281 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 138 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 5058 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 5168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 5058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:47,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 163 Invalid, 5168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 5058 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-01-31 21:10:47,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2022-01-31 21:10:47,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 326. [2022-01-31 21:10:47,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 318 states have (on average 1.1603773584905661) internal successors, (369), 319 states have internal predecessors, (369), 4 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 21:10:47,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 376 transitions. [2022-01-31 21:10:47,468 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 376 transitions. Word has length 86 [2022-01-31 21:10:47,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:47,468 INFO L470 AbstractCegarLoop]: Abstraction has 326 states and 376 transitions. [2022-01-31 21:10:47,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 57 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:47,468 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 376 transitions. [2022-01-31 21:10:47,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:10:47,469 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:47,469 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:47,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:10:47,469 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:47,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:47,470 INFO L85 PathProgramCache]: Analyzing trace with hash -973926746, now seen corresponding path program 10 times [2022-01-31 21:10:47,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:47,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250552443] [2022-01-31 21:10:47,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:47,486 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:47,486 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:10:47,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:47,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:47,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:47,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:47,576 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 21:10:47,790 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:47,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250552443] [2022-01-31 21:10:47,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1250552443] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:47,790 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:47,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:10:47,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713085761] [2022-01-31 21:10:47,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:47,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:10:47,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:47,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:10:47,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=547, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:10:47,791 INFO L87 Difference]: Start difference. First operand 326 states and 376 transitions. Second operand has 28 states, 28 states have (on average 2.892857142857143) internal successors, (81), 27 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:48,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:48,237 INFO L93 Difference]: Finished difference Result 544 states and 629 transitions. [2022-01-31 21:10:48,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:10:48,237 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.892857142857143) internal successors, (81), 27 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 89 [2022-01-31 21:10:48,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:48,238 INFO L225 Difference]: With dead ends: 544 [2022-01-31 21:10:48,238 INFO L226 Difference]: Without dead ends: 456 [2022-01-31 21:10:48,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 26 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=209, Invalid=547, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:10:48,239 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 83 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:48,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 32 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:10:48,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2022-01-31 21:10:48,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 364. [2022-01-31 21:10:48,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 356 states have (on average 1.148876404494382) internal successors, (409), 357 states have internal predecessors, (409), 4 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 21:10:48,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 416 transitions. [2022-01-31 21:10:48,450 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 416 transitions. Word has length 89 [2022-01-31 21:10:48,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:48,450 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 416 transitions. [2022-01-31 21:10:48,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.892857142857143) internal successors, (81), 27 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:10:48,450 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 416 transitions. [2022-01-31 21:10:48,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:10:48,451 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:48,451 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:48,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:10:48,451 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:48,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:48,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1904424796, now seen corresponding path program 27 times [2022-01-31 21:10:48,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:48,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602638497] [2022-01-31 21:10:48,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:48,484 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:48,518 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 21:10:48,518 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:48,551 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 21:10:48,586 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 21:10:48,586 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:48,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:48,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:48,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:48,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:48,689 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 21:10:50,398 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:50,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602638497] [2022-01-31 21:10:50,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1602638497] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:50,399 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:50,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-01-31 21:10:50,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140630374] [2022-01-31 21:10:50,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:50,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-01-31 21:10:50,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:50,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-01-31 21:10:50,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=3591, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:10:50,400 INFO L87 Difference]: Start difference. First operand 364 states and 416 transitions. Second operand has 60 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:52,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:52,940 INFO L93 Difference]: Finished difference Result 554 states and 640 transitions. [2022-01-31 21:10:52,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-01-31 21:10:52,940 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-01-31 21:10:52,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:52,942 INFO L225 Difference]: With dead ends: 554 [2022-01-31 21:10:52,942 INFO L226 Difference]: Without dead ends: 468 [2022-01-31 21:10:52,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1608 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=442, Invalid=5878, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 21:10:52,943 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 89 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 4849 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 4900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 4849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:52,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 183 Invalid, 4900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 4849 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:10:52,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2022-01-31 21:10:53,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 367. [2022-01-31 21:10:53,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 359 states have (on average 1.1476323119777159) internal successors, (412), 360 states have internal predecessors, (412), 4 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 21:10:53,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 419 transitions. [2022-01-31 21:10:53,176 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 419 transitions. Word has length 89 [2022-01-31 21:10:53,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:53,176 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 419 transitions. [2022-01-31 21:10:53,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.4166666666666667) internal successors, (85), 58 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:53,176 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 419 transitions. [2022-01-31 21:10:53,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:10:53,177 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:53,177 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:53,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:10:53,177 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:53,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:53,177 INFO L85 PathProgramCache]: Analyzing trace with hash 493670760, now seen corresponding path program 28 times [2022-01-31 21:10:53,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:53,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570520884] [2022-01-31 21:10:53,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:53,214 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:53,251 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 21:10:53,251 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:53,283 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:53,319 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:53,319 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:53,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:53,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:53,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:53,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:53,395 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 21:10:54,798 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:54,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570520884] [2022-01-31 21:10:54,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [570520884] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:54,798 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:54,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-01-31 21:10:54,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450027979] [2022-01-31 21:10:54,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:54,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-01-31 21:10:54,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:54,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-01-31 21:10:54,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=3519, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:10:54,800 INFO L87 Difference]: Start difference. First operand 367 states and 419 transitions. Second operand has 61 states, 61 states have (on average 1.3934426229508197) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:57,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:10:57,794 INFO L93 Difference]: Finished difference Result 571 states and 659 transitions. [2022-01-31 21:10:57,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-01-31 21:10:57,794 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.3934426229508197) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-01-31 21:10:57,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:10:57,795 INFO L225 Difference]: With dead ends: 571 [2022-01-31 21:10:57,795 INFO L226 Difference]: Without dead ends: 485 [2022-01-31 21:10:57,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2164 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=494, Invalid=7878, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:10:57,796 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 140 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 5624 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 5737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 5624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:10:57,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 193 Invalid, 5737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 5624 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:10:57,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-01-31 21:10:58,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 367. [2022-01-31 21:10:58,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 359 states have (on average 1.15041782729805) internal successors, (413), 360 states have internal predecessors, (413), 4 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 21:10:58,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 420 transitions. [2022-01-31 21:10:58,054 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 420 transitions. Word has length 89 [2022-01-31 21:10:58,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:10:58,054 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 420 transitions. [2022-01-31 21:10:58,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.3934426229508197) internal successors, (85), 59 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:10:58,055 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 420 transitions. [2022-01-31 21:10:58,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-01-31 21:10:58,055 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:10:58,055 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:10:58,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:10:58,055 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:10:58,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:10:58,056 INFO L85 PathProgramCache]: Analyzing trace with hash 1594379399, now seen corresponding path program 29 times [2022-01-31 21:10:58,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:10:58,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789939781] [2022-01-31 21:10:58,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:10:58,092 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:58,133 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:58,133 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:58,177 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:10:58,212 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 21:10:58,212 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:10:58,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:10:58,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:58,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:10:58,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:10:58,288 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 21:10:59,797 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:10:59,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789939781] [2022-01-31 21:10:59,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1789939781] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:10:59,797 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:10:59,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-01-31 21:10:59,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574565001] [2022-01-31 21:10:59,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:10:59,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-01-31 21:10:59,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:10:59,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-01-31 21:10:59,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=3646, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:10:59,798 INFO L87 Difference]: Start difference. First operand 367 states and 420 transitions. Second operand has 62 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:03,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:03,142 INFO L93 Difference]: Finished difference Result 576 states and 666 transitions. [2022-01-31 21:11:03,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-01-31 21:11:03,143 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2022-01-31 21:11:03,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:03,144 INFO L225 Difference]: With dead ends: 576 [2022-01-31 21:11:03,144 INFO L226 Difference]: Without dead ends: 490 [2022-01-31 21:11:03,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2024 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=457, Invalid=7915, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:11:03,145 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 123 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 6724 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 6842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 6724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:03,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 275 Invalid, 6842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 6724 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-01-31 21:11:03,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2022-01-31 21:11:03,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 402. [2022-01-31 21:11:03,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 394 states have (on average 1.1421319796954315) internal successors, (450), 395 states have internal predecessors, (450), 4 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 21:11:03,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 457 transitions. [2022-01-31 21:11:03,433 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 457 transitions. Word has length 92 [2022-01-31 21:11:03,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:03,433 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 457 transitions. [2022-01-31 21:11:03,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 60 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:03,433 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 457 transitions. [2022-01-31 21:11:03,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-01-31 21:11:03,434 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:03,434 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:03,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:11:03,434 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:03,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:03,434 INFO L85 PathProgramCache]: Analyzing trace with hash 657325186, now seen corresponding path program 11 times [2022-01-31 21:11:03,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:03,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997293260] [2022-01-31 21:11:03,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:03,446 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 21:11:03,446 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:11:03,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:03,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:03,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:03,534 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 21:11:03,813 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:03,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997293260] [2022-01-31 21:11:03,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [997293260] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:03,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:03,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:11:03,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811897752] [2022-01-31 21:11:03,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:03,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:11:03,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:03,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:11:03,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=631, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:11:03,814 INFO L87 Difference]: Start difference. First operand 402 states and 457 transitions. Second operand has 30 states, 30 states have (on average 2.9) internal successors, (87), 29 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:04,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:04,362 INFO L93 Difference]: Finished difference Result 608 states and 700 transitions. [2022-01-31 21:11:04,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:11:04,363 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.9) internal successors, (87), 29 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 95 [2022-01-31 21:11:04,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:04,364 INFO L225 Difference]: With dead ends: 608 [2022-01-31 21:11:04,364 INFO L226 Difference]: Without dead ends: 514 [2022-01-31 21:11:04,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 23 SyntacticMatches, 19 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=239, Invalid=631, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:11:04,364 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 89 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 533 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:04,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 32 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 533 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:11:04,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2022-01-31 21:11:04,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 446. [2022-01-31 21:11:04,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 438 states have (on average 1.1324200913242009) internal successors, (496), 439 states have internal predecessors, (496), 4 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 21:11:04,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 503 transitions. [2022-01-31 21:11:04,687 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 503 transitions. Word has length 95 [2022-01-31 21:11:04,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:04,687 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 503 transitions. [2022-01-31 21:11:04,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.9) internal successors, (87), 29 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:04,687 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 503 transitions. [2022-01-31 21:11:04,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-01-31 21:11:04,688 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:04,688 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:04,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:11:04,688 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:04,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:04,688 INFO L85 PathProgramCache]: Analyzing trace with hash -91153980, now seen corresponding path program 30 times [2022-01-31 21:11:04,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:04,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735550302] [2022-01-31 21:11:04,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:04,730 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 21:11:04,767 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 21:11:04,768 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:04,811 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:04,846 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 21:11:04,846 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:04,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:04,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:04,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:04,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:04,935 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 21:11:06,526 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:06,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735550302] [2022-01-31 21:11:06,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1735550302] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:06,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:06,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-01-31 21:11:06,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108729611] [2022-01-31 21:11:06,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:06,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-01-31 21:11:06,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:06,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-01-31 21:11:06,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=3891, Unknown=0, NotChecked=0, Total=4160 [2022-01-31 21:11:06,527 INFO L87 Difference]: Start difference. First operand 446 states and 503 transitions. Second operand has 64 states, 64 states have (on average 1.421875) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:10,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:10,005 INFO L93 Difference]: Finished difference Result 587 states and 666 transitions. [2022-01-31 21:11:10,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-01-31 21:11:10,005 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.421875) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-01-31 21:11:10,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:10,007 INFO L225 Difference]: With dead ends: 587 [2022-01-31 21:11:10,007 INFO L226 Difference]: Without dead ends: 495 [2022-01-31 21:11:10,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2168 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=473, Invalid=8457, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:11:10,008 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 120 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 7148 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 7270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 7148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:10,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 251 Invalid, 7270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 7148 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-01-31 21:11:10,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2022-01-31 21:11:10,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 449. [2022-01-31 21:11:10,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 441 states have (on average 1.1337868480725624) internal successors, (500), 442 states have internal predecessors, (500), 4 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 21:11:10,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 507 transitions. [2022-01-31 21:11:10,350 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 507 transitions. Word has length 95 [2022-01-31 21:11:10,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:10,350 INFO L470 AbstractCegarLoop]: Abstraction has 449 states and 507 transitions. [2022-01-31 21:11:10,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.421875) internal successors, (91), 62 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:10,350 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 507 transitions. [2022-01-31 21:11:10,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-01-31 21:11:10,351 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:10,351 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:10,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:11:10,351 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:10,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:10,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1353390233, now seen corresponding path program 31 times [2022-01-31 21:11:10,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:10,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253092445] [2022-01-31 21:11:10,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:10,398 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:10,439 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:10,439 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:10,485 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 21:11:10,521 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:10,521 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:10,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:10,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:10,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:10,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:10,609 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 21:11:12,310 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:12,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253092445] [2022-01-31 21:11:12,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1253092445] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:12,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:12,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-01-31 21:11:12,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591791828] [2022-01-31 21:11:12,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:12,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-01-31 21:11:12,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:12,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-01-31 21:11:12,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=4144, Unknown=0, NotChecked=0, Total=4422 [2022-01-31 21:11:12,312 INFO L87 Difference]: Start difference. First operand 449 states and 507 transitions. Second operand has 66 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:15,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:15,925 INFO L93 Difference]: Finished difference Result 591 states and 671 transitions. [2022-01-31 21:11:15,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-01-31 21:11:15,925 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2022-01-31 21:11:15,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:15,926 INFO L225 Difference]: With dead ends: 591 [2022-01-31 21:11:15,926 INFO L226 Difference]: Without dead ends: 499 [2022-01-31 21:11:15,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=489, Invalid=9017, Unknown=0, NotChecked=0, Total=9506 [2022-01-31 21:11:15,927 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 143 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 7438 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 7562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 7438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:15,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 223 Invalid, 7562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 7438 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-01-31 21:11:15,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-01-31 21:11:16,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 452. [2022-01-31 21:11:16,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 444 states have (on average 1.135135135135135) internal successors, (504), 445 states have internal predecessors, (504), 4 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 21:11:16,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 511 transitions. [2022-01-31 21:11:16,262 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 511 transitions. Word has length 98 [2022-01-31 21:11:16,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:16,262 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 511 transitions. [2022-01-31 21:11:16,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 64 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:16,262 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 511 transitions. [2022-01-31 21:11:16,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-01-31 21:11:16,263 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:16,263 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 24, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:16,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:11:16,263 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:16,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:16,264 INFO L85 PathProgramCache]: Analyzing trace with hash 572673894, now seen corresponding path program 12 times [2022-01-31 21:11:16,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:16,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035803651] [2022-01-31 21:11:16,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:16,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:16,281 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:11:16,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:16,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:16,378 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:16,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:16,387 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 21:11:16,698 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:16,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035803651] [2022-01-31 21:11:16,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2035803651] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:16,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:16,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:11:16,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916846428] [2022-01-31 21:11:16,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:16,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:11:16,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:16,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:11:16,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=721, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:11:16,700 INFO L87 Difference]: Start difference. First operand 452 states and 511 transitions. Second operand has 32 states, 32 states have (on average 2.90625) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:17,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:17,366 INFO L93 Difference]: Finished difference Result 672 states and 770 transitions. [2022-01-31 21:11:17,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:11:17,366 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.90625) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 101 [2022-01-31 21:11:17,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:17,368 INFO L225 Difference]: With dead ends: 672 [2022-01-31 21:11:17,368 INFO L226 Difference]: Without dead ends: 572 [2022-01-31 21:11:17,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 25 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 929 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=271, Invalid=721, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:11:17,368 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 86 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:17,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 65 Invalid, 708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:11:17,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2022-01-31 21:11:17,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 499. [2022-01-31 21:11:17,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 491 states have (on average 1.1262729124236253) internal successors, (553), 492 states have internal predecessors, (553), 4 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 21:11:17,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 560 transitions. [2022-01-31 21:11:17,748 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 560 transitions. Word has length 101 [2022-01-31 21:11:17,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:17,748 INFO L470 AbstractCegarLoop]: Abstraction has 499 states and 560 transitions. [2022-01-31 21:11:17,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.90625) internal successors, (93), 31 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:17,748 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 560 transitions. [2022-01-31 21:11:17,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-01-31 21:11:17,749 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:17,749 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:17,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:11:17,749 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:17,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:17,749 INFO L85 PathProgramCache]: Analyzing trace with hash 2100040420, now seen corresponding path program 32 times [2022-01-31 21:11:17,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:17,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820917280] [2022-01-31 21:11:17,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:17,782 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:17,822 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 21:11:17,823 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:17,858 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:17,908 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:17,908 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:17,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:17,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:18,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:18,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:18,032 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 21:11:20,188 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:20,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820917280] [2022-01-31 21:11:20,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [820917280] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:20,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:20,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-01-31 21:11:20,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189967752] [2022-01-31 21:11:20,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:20,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-01-31 21:11:20,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:20,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-01-31 21:11:20,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=4670, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:11:20,189 INFO L87 Difference]: Start difference. First operand 499 states and 560 transitions. Second operand has 68 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:23,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:23,379 INFO L93 Difference]: Finished difference Result 680 states and 779 transitions. [2022-01-31 21:11:23,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-01-31 21:11:23,380 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2022-01-31 21:11:23,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:23,381 INFO L225 Difference]: With dead ends: 680 [2022-01-31 21:11:23,381 INFO L226 Difference]: Without dead ends: 582 [2022-01-31 21:11:23,382 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2106 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=448, Invalid=7742, Unknown=0, NotChecked=0, Total=8190 [2022-01-31 21:11:23,382 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 104 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 5789 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 5850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 5789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:23,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 133 Invalid, 5850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 5789 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:11:23,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2022-01-31 21:11:23,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 464. [2022-01-31 21:11:23,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 456 states have (on average 1.1359649122807018) internal successors, (518), 457 states have internal predecessors, (518), 4 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 21:11:23,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 525 transitions. [2022-01-31 21:11:23,738 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 525 transitions. Word has length 101 [2022-01-31 21:11:23,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:23,738 INFO L470 AbstractCegarLoop]: Abstraction has 464 states and 525 transitions. [2022-01-31 21:11:23,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 66 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:23,738 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 525 transitions. [2022-01-31 21:11:23,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-01-31 21:11:23,739 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:23,739 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:23,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:11:23,739 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:23,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:23,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1606015559, now seen corresponding path program 33 times [2022-01-31 21:11:23,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:23,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481714035] [2022-01-31 21:11:23,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:23,785 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:23,821 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:23,821 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:23,870 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:23,906 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:23,906 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:23,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:23,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:23,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:23,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:23,989 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 21:11:25,833 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:25,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481714035] [2022-01-31 21:11:25,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1481714035] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:25,833 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:25,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-01-31 21:11:25,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291550783] [2022-01-31 21:11:25,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:25,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-01-31 21:11:25,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:25,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-01-31 21:11:25,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=4674, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:11:25,835 INFO L87 Difference]: Start difference. First operand 464 states and 525 transitions. Second operand has 70 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:29,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:29,899 INFO L93 Difference]: Finished difference Result 701 states and 803 transitions. [2022-01-31 21:11:29,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-01-31 21:11:29,899 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2022-01-31 21:11:29,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:29,905 INFO L225 Difference]: With dead ends: 701 [2022-01-31 21:11:29,905 INFO L226 Difference]: Without dead ends: 603 [2022-01-31 21:11:29,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2630 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=521, Invalid=10191, Unknown=0, NotChecked=0, Total=10712 [2022-01-31 21:11:29,906 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 144 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 7917 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 8052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 7917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:29,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 231 Invalid, 8052 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 7917 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-01-31 21:11:29,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2022-01-31 21:11:30,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 505. [2022-01-31 21:11:30,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 497 states have (on average 1.1287726358148893) internal successors, (561), 498 states have internal predecessors, (561), 4 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 21:11:30,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 568 transitions. [2022-01-31 21:11:30,320 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 568 transitions. Word has length 104 [2022-01-31 21:11:30,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:30,321 INFO L470 AbstractCegarLoop]: Abstraction has 505 states and 568 transitions. [2022-01-31 21:11:30,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.4285714285714286) internal successors, (100), 68 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:30,321 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 568 transitions. [2022-01-31 21:11:30,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-01-31 21:11:30,321 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:30,322 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 26, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:30,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:11:30,322 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:30,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:30,322 INFO L85 PathProgramCache]: Analyzing trace with hash 2071662658, now seen corresponding path program 13 times [2022-01-31 21:11:30,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:30,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267301902] [2022-01-31 21:11:30,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:30,342 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:30,343 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:11:30,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:30,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:30,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:30,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:30,456 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 21:11:30,764 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:30,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267301902] [2022-01-31 21:11:30,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1267301902] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:30,765 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:30,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:11:30,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847835707] [2022-01-31 21:11:30,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:30,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:11:30,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:30,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:11:30,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:11:30,766 INFO L87 Difference]: Start difference. First operand 505 states and 568 transitions. Second operand has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:31,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:31,578 INFO L93 Difference]: Finished difference Result 739 states and 843 transitions. [2022-01-31 21:11:31,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:11:31,578 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 107 [2022-01-31 21:11:31,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:31,580 INFO L225 Difference]: With dead ends: 739 [2022-01-31 21:11:31,580 INFO L226 Difference]: Without dead ends: 633 [2022-01-31 21:11:31,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 26 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:11:31,580 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 92 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 825 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:31,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 81 Invalid, 834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 825 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:11:31,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2022-01-31 21:11:32,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 555. [2022-01-31 21:11:32,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 555 states, 547 states have (on average 1.1206581352833638) internal successors, (613), 548 states have internal predecessors, (613), 4 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 21:11:32,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 555 states to 555 states and 620 transitions. [2022-01-31 21:11:32,052 INFO L78 Accepts]: Start accepts. Automaton has 555 states and 620 transitions. Word has length 107 [2022-01-31 21:11:32,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:32,052 INFO L470 AbstractCegarLoop]: Abstraction has 555 states and 620 transitions. [2022-01-31 21:11:32,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:32,052 INFO L276 IsEmpty]: Start isEmpty. Operand 555 states and 620 transitions. [2022-01-31 21:11:32,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-01-31 21:11:32,053 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:32,053 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:32,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:11:32,053 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:32,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:32,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1330662396, now seen corresponding path program 34 times [2022-01-31 21:11:32,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:32,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474041000] [2022-01-31 21:11:32,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:32,093 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:32,128 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:32,128 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:32,159 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:32,194 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 21:11:32,194 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:32,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:32,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:32,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:32,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:32,291 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 21:11:34,639 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:34,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474041000] [2022-01-31 21:11:34,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [474041000] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:34,639 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:34,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2022-01-31 21:11:34,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312684516] [2022-01-31 21:11:34,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:34,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-01-31 21:11:34,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:34,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-01-31 21:11:34,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=5169, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:11:34,641 INFO L87 Difference]: Start difference. First operand 555 states and 620 transitions. Second operand has 72 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:38,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:38,211 INFO L93 Difference]: Finished difference Result 746 states and 851 transitions. [2022-01-31 21:11:38,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-01-31 21:11:38,212 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2022-01-31 21:11:38,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:38,213 INFO L225 Difference]: With dead ends: 746 [2022-01-31 21:11:38,213 INFO L226 Difference]: Without dead ends: 642 [2022-01-31 21:11:38,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2283 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=532, Invalid=8398, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:11:38,214 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 104 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 6771 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 6832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 6771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:38,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 243 Invalid, 6832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 6771 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-01-31 21:11:38,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 642 states. [2022-01-31 21:11:38,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 642 to 517. [2022-01-31 21:11:38,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 509 states have (on average 1.1296660117878192) internal successors, (575), 510 states have internal predecessors, (575), 4 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 21:11:38,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 582 transitions. [2022-01-31 21:11:38,651 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 582 transitions. Word has length 107 [2022-01-31 21:11:38,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:38,651 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 582 transitions. [2022-01-31 21:11:38,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 70 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:38,651 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 582 transitions. [2022-01-31 21:11:38,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-01-31 21:11:38,652 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:38,652 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:38,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:11:38,652 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:38,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:38,652 INFO L85 PathProgramCache]: Analyzing trace with hash 580199719, now seen corresponding path program 35 times [2022-01-31 21:11:38,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:38,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998996888] [2022-01-31 21:11:38,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:38,698 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 21:11:38,737 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:38,737 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:38,769 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 21:11:38,804 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 21:11:38,804 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:38,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:38,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:38,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:38,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:38,918 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 21:11:41,465 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:41,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998996888] [2022-01-31 21:11:41,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1998996888] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:41,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:41,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2022-01-31 21:11:41,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764027469] [2022-01-31 21:11:41,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:41,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-01-31 21:11:41,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:41,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-01-31 21:11:41,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=5460, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:11:41,467 INFO L87 Difference]: Start difference. First operand 517 states and 582 transitions. Second operand has 74 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:45,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:45,163 INFO L93 Difference]: Finished difference Result 750 states and 856 transitions. [2022-01-31 21:11:45,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-01-31 21:11:45,164 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2022-01-31 21:11:45,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:45,165 INFO L225 Difference]: With dead ends: 750 [2022-01-31 21:11:45,165 INFO L226 Difference]: Without dead ends: 646 [2022-01-31 21:11:45,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2433 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=551, Invalid=8955, Unknown=0, NotChecked=0, Total=9506 [2022-01-31 21:11:45,167 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 106 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 6953 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 7017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 6953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:45,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 233 Invalid, 7017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 6953 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-01-31 21:11:45,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2022-01-31 21:11:45,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 520. [2022-01-31 21:11:45,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 512 states have (on average 1.12890625) internal successors, (578), 513 states have internal predecessors, (578), 4 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 21:11:45,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 585 transitions. [2022-01-31 21:11:45,614 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 585 transitions. Word has length 110 [2022-01-31 21:11:45,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:45,615 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 585 transitions. [2022-01-31 21:11:45,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.4324324324324325) internal successors, (106), 72 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:45,615 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 585 transitions. [2022-01-31 21:11:45,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-01-31 21:11:45,615 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:45,616 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:45,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:11:45,616 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:45,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:45,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1977417443, now seen corresponding path program 36 times [2022-01-31 21:11:45,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:45,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323259088] [2022-01-31 21:11:45,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:45,649 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 21:11:45,686 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 21:11:45,686 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:45,730 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 21:11:45,774 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 21:11:45,774 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:45,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:45,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:45,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:45,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:45,851 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 21:11:47,885 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:47,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323259088] [2022-01-31 21:11:47,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [323259088] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:47,885 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:47,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-01-31 21:11:47,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573644827] [2022-01-31 21:11:47,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:47,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-01-31 21:11:47,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:47,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-01-31 21:11:47,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=5374, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:11:47,887 INFO L87 Difference]: Start difference. First operand 520 states and 585 transitions. Second operand has 75 states, 75 states have (on average 1.4133333333333333) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:52,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:52,602 INFO L93 Difference]: Finished difference Result 770 states and 878 transitions. [2022-01-31 21:11:52,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-01-31 21:11:52,602 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.4133333333333333) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2022-01-31 21:11:52,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:52,604 INFO L225 Difference]: With dead ends: 770 [2022-01-31 21:11:52,604 INFO L226 Difference]: Without dead ends: 666 [2022-01-31 21:11:52,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3315 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=613, Invalid=12043, Unknown=0, NotChecked=0, Total=12656 [2022-01-31 21:11:52,605 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 187 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 9059 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 9197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 9059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:52,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 193 Invalid, 9197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 9059 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-01-31 21:11:52,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 666 states. [2022-01-31 21:11:53,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 666 to 520. [2022-01-31 21:11:53,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 512 states have (on average 1.130859375) internal successors, (579), 513 states have internal predecessors, (579), 4 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 21:11:53,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 586 transitions. [2022-01-31 21:11:53,078 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 586 transitions. Word has length 110 [2022-01-31 21:11:53,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:53,078 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 586 transitions. [2022-01-31 21:11:53,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.4133333333333333) internal successors, (106), 73 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:11:53,078 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 586 transitions. [2022-01-31 21:11:53,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-01-31 21:11:53,079 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:53,079 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 28, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:53,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-01-31 21:11:53,079 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:53,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:53,080 INFO L85 PathProgramCache]: Analyzing trace with hash -985575386, now seen corresponding path program 14 times [2022-01-31 21:11:53,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:53,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877331047] [2022-01-31 21:11:53,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:53,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:53,098 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:11:53,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:53,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:53,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:53,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:53,220 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 21:11:53,565 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:53,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877331047] [2022-01-31 21:11:53,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [877331047] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:53,565 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:53,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:11:53,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070979926] [2022-01-31 21:11:53,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:53,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:11:53,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:53,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:11:53,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=919, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:11:53,566 INFO L87 Difference]: Start difference. First operand 520 states and 586 transitions. Second operand has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 35 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:54,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:11:54,510 INFO L93 Difference]: Finished difference Result 806 states and 915 transitions. [2022-01-31 21:11:54,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:11:54,510 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 35 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 113 [2022-01-31 21:11:54,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:11:54,512 INFO L225 Difference]: With dead ends: 806 [2022-01-31 21:11:54,512 INFO L226 Difference]: Without dead ends: 694 [2022-01-31 21:11:54,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 27 SyntacticMatches, 21 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=341, Invalid=919, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:11:54,512 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 102 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:11:54,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 54 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:11:54,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2022-01-31 21:11:55,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 570. [2022-01-31 21:11:55,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 562 states have (on average 1.1227758007117439) internal successors, (631), 563 states have internal predecessors, (631), 4 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 21:11:55,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 638 transitions. [2022-01-31 21:11:55,044 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 638 transitions. Word has length 113 [2022-01-31 21:11:55,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:11:55,044 INFO L470 AbstractCegarLoop]: Abstraction has 570 states and 638 transitions. [2022-01-31 21:11:55,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.9166666666666665) internal successors, (105), 35 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:11:55,045 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 638 transitions. [2022-01-31 21:11:55,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-01-31 21:11:55,045 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:11:55,045 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:11:55,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-01-31 21:11:55,045 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:11:55,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:11:55,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1576926500, now seen corresponding path program 37 times [2022-01-31 21:11:55,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:11:55,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042124029] [2022-01-31 21:11:55,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:11:55,091 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:55,130 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:55,130 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:55,163 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:11:55,198 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 21:11:55,198 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:11:55,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:11:55,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:55,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:11:55,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:11:55,278 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 21:11:57,419 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:11:57,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042124029] [2022-01-31 21:11:57,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1042124029] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:11:57,420 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:11:57,420 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2022-01-31 21:11:57,420 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980573543] [2022-01-31 21:11:57,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:11:57,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-01-31 21:11:57,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:11:57,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-01-31 21:11:57,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=5529, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:11:57,421 INFO L87 Difference]: Start difference. First operand 570 states and 638 transitions. Second operand has 76 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:02,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:02,767 INFO L93 Difference]: Finished difference Result 831 states and 943 transitions. [2022-01-31 21:12:02,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-01-31 21:12:02,767 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2022-01-31 21:12:02,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:02,769 INFO L225 Difference]: With dead ends: 831 [2022-01-31 21:12:02,769 INFO L226 Difference]: Without dead ends: 721 [2022-01-31 21:12:02,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3137 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=569, Invalid=12087, Unknown=0, NotChecked=0, Total=12656 [2022-01-31 21:12:02,770 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 148 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 10736 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 10883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 10736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:02,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 353 Invalid, 10883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 10736 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-01-31 21:12:02,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2022-01-31 21:12:03,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 617. [2022-01-31 21:12:03,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 617 states, 609 states have (on average 1.116584564860427) internal successors, (680), 610 states have internal predecessors, (680), 4 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 21:12:03,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 617 states to 617 states and 687 transitions. [2022-01-31 21:12:03,406 INFO L78 Accepts]: Start accepts. Automaton has 617 states and 687 transitions. Word has length 113 [2022-01-31 21:12:03,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:03,406 INFO L470 AbstractCegarLoop]: Abstraction has 617 states and 687 transitions. [2022-01-31 21:12:03,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 74 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:03,407 INFO L276 IsEmpty]: Start isEmpty. Operand 617 states and 687 transitions. [2022-01-31 21:12:03,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-01-31 21:12:03,407 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:03,407 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:03,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-01-31 21:12:03,408 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:03,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:03,408 INFO L85 PathProgramCache]: Analyzing trace with hash -339425273, now seen corresponding path program 38 times [2022-01-31 21:12:03,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:03,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456697304] [2022-01-31 21:12:03,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:03,453 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 21:12:03,487 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 21:12:03,488 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:03,531 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:03,566 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 21:12:03,566 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:03,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:03,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:03,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:03,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:03,636 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 21:12:05,879 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:05,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456697304] [2022-01-31 21:12:05,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1456697304] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:05,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:05,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2022-01-31 21:12:05,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557572372] [2022-01-31 21:12:05,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:05,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-01-31 21:12:05,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:05,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-01-31 21:12:05,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=5830, Unknown=0, NotChecked=0, Total=6162 [2022-01-31 21:12:05,881 INFO L87 Difference]: Start difference. First operand 617 states and 687 transitions. Second operand has 78 states, 78 states have (on average 1.435897435897436) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:10,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:10,735 INFO L93 Difference]: Finished difference Result 783 states and 878 transitions. [2022-01-31 21:12:10,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-01-31 21:12:10,735 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.435897435897436) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2022-01-31 21:12:10,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:10,739 INFO L225 Difference]: With dead ends: 783 [2022-01-31 21:12:10,739 INFO L226 Difference]: Without dead ends: 673 [2022-01-31 21:12:10,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3316 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=585, Invalid=12755, Unknown=0, NotChecked=0, Total=13340 [2022-01-31 21:12:10,740 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 234 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 9243 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 9393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 9243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:10,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 76 Invalid, 9393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 9243 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-01-31 21:12:10,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2022-01-31 21:12:11,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 620. [2022-01-31 21:12:11,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 612 states have (on average 1.1176470588235294) internal successors, (684), 613 states have internal predecessors, (684), 4 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 21:12:11,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 691 transitions. [2022-01-31 21:12:11,403 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 691 transitions. Word has length 116 [2022-01-31 21:12:11,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:11,403 INFO L470 AbstractCegarLoop]: Abstraction has 620 states and 691 transitions. [2022-01-31 21:12:11,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.435897435897436) internal successors, (112), 76 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:11,404 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 691 transitions. [2022-01-31 21:12:11,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-01-31 21:12:11,405 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:11,405 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:11,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-01-31 21:12:11,405 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:11,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:11,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1880204290, now seen corresponding path program 15 times [2022-01-31 21:12:11,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:11,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18322189] [2022-01-31 21:12:11,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:11,422 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:11,422 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:12:11,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:11,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:11,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:11,555 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 21:12:11,948 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:11,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18322189] [2022-01-31 21:12:11,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [18322189] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:11,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:11,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:12:11,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917793807] [2022-01-31 21:12:11,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:11,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:12:11,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:11,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:12:11,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=1027, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:12:11,950 INFO L87 Difference]: Start difference. First operand 620 states and 691 transitions. Second operand has 38 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 37 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:13,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:13,074 INFO L93 Difference]: Finished difference Result 882 states and 998 transitions. [2022-01-31 21:12:13,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:12:13,075 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 37 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 119 [2022-01-31 21:12:13,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:13,077 INFO L225 Difference]: With dead ends: 882 [2022-01-31 21:12:13,077 INFO L226 Difference]: Without dead ends: 764 [2022-01-31 21:12:13,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 27 SyntacticMatches, 23 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1367 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=379, Invalid=1027, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:12:13,078 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 108 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:13,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 54 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 952 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:12:13,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 764 states. [2022-01-31 21:12:13,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 764 to 676. [2022-01-31 21:12:13,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 676 states, 668 states have (on average 1.1107784431137724) internal successors, (742), 669 states have internal predecessors, (742), 4 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 21:12:13,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 676 states to 676 states and 749 transitions. [2022-01-31 21:12:13,792 INFO L78 Accepts]: Start accepts. Automaton has 676 states and 749 transitions. Word has length 119 [2022-01-31 21:12:13,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:13,792 INFO L470 AbstractCegarLoop]: Abstraction has 676 states and 749 transitions. [2022-01-31 21:12:13,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.9210526315789473) internal successors, (111), 37 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:13,792 INFO L276 IsEmpty]: Start isEmpty. Operand 676 states and 749 transitions. [2022-01-31 21:12:13,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-01-31 21:12:13,793 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:13,793 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:13,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-01-31 21:12:13,793 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:13,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:13,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1669796284, now seen corresponding path program 39 times [2022-01-31 21:12:13,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:13,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225983450] [2022-01-31 21:12:13,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:13,847 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:13,890 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 21:12:13,891 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:13,925 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 21:12:13,962 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:13,963 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:13,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:13,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:14,033 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:14,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:14,036 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 21:12:16,962 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:16,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225983450] [2022-01-31 21:12:16,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225983450] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:16,963 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:16,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2022-01-31 21:12:16,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280693603] [2022-01-31 21:12:16,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:16,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-01-31 21:12:16,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:16,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-01-31 21:12:16,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=6292, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:12:16,964 INFO L87 Difference]: Start difference. First operand 676 states and 749 transitions. Second operand has 80 states, 80 states have (on average 1.4375) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:21,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:21,099 INFO L93 Difference]: Finished difference Result 887 states and 1004 transitions. [2022-01-31 21:12:21,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-01-31 21:12:21,100 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.4375) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2022-01-31 21:12:21,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:21,101 INFO L225 Difference]: With dead ends: 887 [2022-01-31 21:12:21,101 INFO L226 Difference]: Without dead ends: 771 [2022-01-31 21:12:21,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2717 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=498, Invalid=10214, Unknown=0, NotChecked=0, Total=10712 [2022-01-31 21:12:21,102 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 115 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 7680 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 7803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 7680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:21,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 73 Invalid, 7803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 7680 Invalid, 0 Unknown, 57 Unchecked, 2.4s Time] [2022-01-31 21:12:21,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2022-01-31 21:12:21,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 632. [2022-01-31 21:12:21,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 632 states, 624 states have (on average 1.1185897435897436) internal successors, (698), 625 states have internal predecessors, (698), 4 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 21:12:21,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 632 states to 632 states and 705 transitions. [2022-01-31 21:12:21,777 INFO L78 Accepts]: Start accepts. Automaton has 632 states and 705 transitions. Word has length 119 [2022-01-31 21:12:21,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:21,777 INFO L470 AbstractCegarLoop]: Abstraction has 632 states and 705 transitions. [2022-01-31 21:12:21,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.4375) internal successors, (115), 78 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:21,777 INFO L276 IsEmpty]: Start isEmpty. Operand 632 states and 705 transitions. [2022-01-31 21:12:21,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-01-31 21:12:21,778 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:21,778 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:21,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-01-31 21:12:21,778 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:21,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:21,778 INFO L85 PathProgramCache]: Analyzing trace with hash -794377497, now seen corresponding path program 40 times [2022-01-31 21:12:21,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:21,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828687344] [2022-01-31 21:12:21,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:21,823 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 21:12:21,857 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 21:12:21,858 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:21,889 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 21:12:21,923 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:21,923 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:21,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:21,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:21,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:21,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:21,996 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 21:12:24,419 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:24,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828687344] [2022-01-31 21:12:24,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [828687344] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:24,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:24,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2022-01-31 21:12:24,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736641667] [2022-01-31 21:12:24,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:24,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-01-31 21:12:24,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:24,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-01-31 21:12:24,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=6456, Unknown=0, NotChecked=0, Total=6806 [2022-01-31 21:12:24,421 INFO L87 Difference]: Start difference. First operand 632 states and 705 transitions. Second operand has 82 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:30,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:30,535 INFO L93 Difference]: Finished difference Result 911 states and 1031 transitions. [2022-01-31 21:12:30,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2022-01-31 21:12:30,536 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2022-01-31 21:12:30,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:30,537 INFO L225 Difference]: With dead ends: 911 [2022-01-31 21:12:30,537 INFO L226 Difference]: Without dead ends: 795 [2022-01-31 21:12:30,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3689 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=617, Invalid=14145, Unknown=0, NotChecked=0, Total=14762 [2022-01-31 21:12:30,539 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 152 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 12383 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 12540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 12383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:30,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 318 Invalid, 12540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 12383 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-01-31 21:12:30,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2022-01-31 21:12:31,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 682. [2022-01-31 21:12:31,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 682 states, 674 states have (on average 1.1127596439169138) internal successors, (750), 675 states have internal predecessors, (750), 4 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 21:12:31,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 757 transitions. [2022-01-31 21:12:31,306 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 757 transitions. Word has length 122 [2022-01-31 21:12:31,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:31,307 INFO L470 AbstractCegarLoop]: Abstraction has 682 states and 757 transitions. [2022-01-31 21:12:31,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.4390243902439024) internal successors, (118), 80 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:31,307 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 757 transitions. [2022-01-31 21:12:31,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-01-31 21:12:31,308 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:31,308 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:31,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-01-31 21:12:31,308 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:31,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:31,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1442311962, now seen corresponding path program 16 times [2022-01-31 21:12:31,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:31,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398320665] [2022-01-31 21:12:31,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:31,327 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:31,327 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:12:31,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:31,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:31,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:31,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:31,473 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 21:12:31,909 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:31,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398320665] [2022-01-31 21:12:31,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [398320665] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:31,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:31,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:12:31,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468861295] [2022-01-31 21:12:31,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:31,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:12:31,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:31,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:12:31,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1141, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:12:31,910 INFO L87 Difference]: Start difference. First operand 682 states and 757 transitions. Second operand has 40 states, 40 states have (on average 2.925) internal successors, (117), 39 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:33,173 INFO L93 Difference]: Finished difference Result 958 states and 1080 transitions. [2022-01-31 21:12:33,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:12:33,173 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.925) internal successors, (117), 39 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 125 [2022-01-31 21:12:33,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:33,175 INFO L225 Difference]: With dead ends: 958 [2022-01-31 21:12:33,175 INFO L226 Difference]: Without dead ends: 834 [2022-01-31 21:12:33,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 26 SyntacticMatches, 26 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1555 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=419, Invalid=1141, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:12:33,176 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 133 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:33,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 37 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:12:33,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 834 states. [2022-01-31 21:12:34,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 834 to 741. [2022-01-31 21:12:34,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 741 states, 733 states have (on average 1.106412005457026) internal successors, (811), 734 states have internal predecessors, (811), 4 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 21:12:34,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 818 transitions. [2022-01-31 21:12:34,027 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 818 transitions. Word has length 125 [2022-01-31 21:12:34,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:34,027 INFO L470 AbstractCegarLoop]: Abstraction has 741 states and 818 transitions. [2022-01-31 21:12:34,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.925) internal successors, (117), 39 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:34,027 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 818 transitions. [2022-01-31 21:12:34,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-01-31 21:12:34,028 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:34,028 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:34,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-01-31 21:12:34,028 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:34,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:34,029 INFO L85 PathProgramCache]: Analyzing trace with hash -234715292, now seen corresponding path program 41 times [2022-01-31 21:12:34,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:34,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600724988] [2022-01-31 21:12:34,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:34,062 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 21:12:34,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:34,097 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:34,131 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 21:12:34,165 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 21:12:34,166 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:34,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:34,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:34,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:34,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:34,235 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 21:12:36,771 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:36,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600724988] [2022-01-31 21:12:36,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [600724988] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:36,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:36,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-01-31 21:12:36,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928086851] [2022-01-31 21:12:36,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:36,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-01-31 21:12:36,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:36,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-01-31 21:12:36,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=6781, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:12:36,773 INFO L87 Difference]: Start difference. First operand 741 states and 818 transitions. Second operand has 84 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:42,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:42,724 INFO L93 Difference]: Finished difference Result 922 states and 1026 transitions. [2022-01-31 21:12:42,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-01-31 21:12:42,725 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2022-01-31 21:12:42,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:42,727 INFO L225 Difference]: With dead ends: 922 [2022-01-31 21:12:42,727 INFO L226 Difference]: Without dead ends: 800 [2022-01-31 21:12:42,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3883 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=633, Invalid=14867, Unknown=0, NotChecked=0, Total=15500 [2022-01-31 21:12:42,728 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 247 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 11534 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 11697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 11534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:42,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 124 Invalid, 11697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 11534 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-01-31 21:12:42,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2022-01-31 21:12:43,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 744. [2022-01-31 21:12:43,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 744 states, 736 states have (on average 1.107336956521739) internal successors, (815), 737 states have internal predecessors, (815), 4 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 21:12:43,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 744 states to 744 states and 822 transitions. [2022-01-31 21:12:43,617 INFO L78 Accepts]: Start accepts. Automaton has 744 states and 822 transitions. Word has length 125 [2022-01-31 21:12:43,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:43,617 INFO L470 AbstractCegarLoop]: Abstraction has 744 states and 822 transitions. [2022-01-31 21:12:43,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.4404761904761905) internal successors, (121), 82 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:43,617 INFO L276 IsEmpty]: Start isEmpty. Operand 744 states and 822 transitions. [2022-01-31 21:12:43,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-01-31 21:12:43,618 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:43,618 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:43,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-01-31 21:12:43,618 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:43,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:43,618 INFO L85 PathProgramCache]: Analyzing trace with hash -401009209, now seen corresponding path program 42 times [2022-01-31 21:12:43,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:43,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987256038] [2022-01-31 21:12:43,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:43,664 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:43,701 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:43,701 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:43,745 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:43,781 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:43,781 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:43,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:43,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:43,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:43,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:43,890 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 21:12:46,517 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:46,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987256038] [2022-01-31 21:12:46,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1987256038] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:46,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:46,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2022-01-31 21:12:46,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486494483] [2022-01-31 21:12:46,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:46,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-01-31 21:12:46,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:46,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-01-31 21:12:46,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=7113, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:12:46,519 INFO L87 Difference]: Start difference. First operand 744 states and 822 transitions. Second operand has 86 states, 86 states have (on average 1.441860465116279) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:52,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:52,538 INFO L93 Difference]: Finished difference Result 926 states and 1031 transitions. [2022-01-31 21:12:52,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-01-31 21:12:52,538 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.441860465116279) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2022-01-31 21:12:52,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:52,540 INFO L225 Difference]: With dead ends: 926 [2022-01-31 21:12:52,540 INFO L226 Difference]: Without dead ends: 804 [2022-01-31 21:12:52,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4157 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=650, Invalid=15606, Unknown=0, NotChecked=0, Total=16256 [2022-01-31 21:12:52,541 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 247 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 11288 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 11455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 11288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:52,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 106 Invalid, 11455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 11288 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-01-31 21:12:52,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2022-01-31 21:12:53,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 747. [2022-01-31 21:12:53,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 739 states have (on average 1.108254397834912) internal successors, (819), 740 states have internal predecessors, (819), 4 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 21:12:53,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 826 transitions. [2022-01-31 21:12:53,432 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 826 transitions. Word has length 128 [2022-01-31 21:12:53,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:53,432 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 826 transitions. [2022-01-31 21:12:53,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.441860465116279) internal successors, (124), 84 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:12:53,432 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 826 transitions. [2022-01-31 21:12:53,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-01-31 21:12:53,433 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:53,433 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:53,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-01-31 21:12:53,433 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:53,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:53,433 INFO L85 PathProgramCache]: Analyzing trace with hash 1062844354, now seen corresponding path program 17 times [2022-01-31 21:12:53,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:53,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408107993] [2022-01-31 21:12:53,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:53,452 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:53,452 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:12:53,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:53,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:53,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:53,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:53,614 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 21:12:54,077 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:54,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408107993] [2022-01-31 21:12:54,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [408107993] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:54,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:54,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:12:54,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667541283] [2022-01-31 21:12:54,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:54,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:12:54,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:54,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:12:54,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1261, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:12:54,079 INFO L87 Difference]: Start difference. First operand 747 states and 826 transitions. Second operand has 42 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 41 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:55,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:12:55,557 INFO L93 Difference]: Finished difference Result 1037 states and 1165 transitions. [2022-01-31 21:12:55,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:12:55,557 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 41 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 131 [2022-01-31 21:12:55,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:12:55,559 INFO L225 Difference]: With dead ends: 1037 [2022-01-31 21:12:55,559 INFO L226 Difference]: Without dead ends: 907 [2022-01-31 21:12:55,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 27 SyntacticMatches, 27 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1718 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=461, Invalid=1261, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:12:55,560 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 143 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:12:55,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 38 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1075 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:12:55,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 907 states. [2022-01-31 21:12:56,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 907 to 809. [2022-01-31 21:12:56,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 809 states, 801 states have (on average 1.1023720349563046) internal successors, (883), 802 states have internal predecessors, (883), 4 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 21:12:56,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 809 states to 809 states and 890 transitions. [2022-01-31 21:12:56,566 INFO L78 Accepts]: Start accepts. Automaton has 809 states and 890 transitions. Word has length 131 [2022-01-31 21:12:56,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:12:56,566 INFO L470 AbstractCegarLoop]: Abstraction has 809 states and 890 transitions. [2022-01-31 21:12:56,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 41 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:12:56,566 INFO L276 IsEmpty]: Start isEmpty. Operand 809 states and 890 transitions. [2022-01-31 21:12:56,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-01-31 21:12:56,568 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:12:56,568 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:12:56,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-01-31 21:12:56,568 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:12:56,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:12:56,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1929169028, now seen corresponding path program 43 times [2022-01-31 21:12:56,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:12:56,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365164963] [2022-01-31 21:12:56,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:12:56,612 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 21:12:56,646 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:56,646 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:56,677 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:56,712 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:12:56,712 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:12:56,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:12:56,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:56,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:12:56,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:12:56,799 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 21:12:59,577 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:12:59,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365164963] [2022-01-31 21:12:59,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1365164963] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:12:59,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:12:59,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2022-01-31 21:12:59,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400892603] [2022-01-31 21:12:59,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:12:59,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-01-31 21:12:59,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:12:59,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-01-31 21:12:59,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=7455, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:12:59,579 INFO L87 Difference]: Start difference. First operand 809 states and 890 transitions. Second operand has 88 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:06,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:06,154 INFO L93 Difference]: Finished difference Result 998 states and 1107 transitions. [2022-01-31 21:13:06,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-01-31 21:13:06,155 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2022-01-31 21:13:06,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:06,157 INFO L225 Difference]: With dead ends: 998 [2022-01-31 21:13:06,157 INFO L226 Difference]: Without dead ends: 870 [2022-01-31 21:13:06,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4286 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=665, Invalid=16365, Unknown=0, NotChecked=0, Total=17030 [2022-01-31 21:13:06,158 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 172 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 12616 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 12786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 12616 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:06,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 291 Invalid, 12786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 12616 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-01-31 21:13:06,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2022-01-31 21:13:07,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 812. [2022-01-31 21:13:07,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 804 states have (on average 1.1032338308457712) internal successors, (887), 805 states have internal predecessors, (887), 4 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 21:13:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 894 transitions. [2022-01-31 21:13:07,189 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 894 transitions. Word has length 131 [2022-01-31 21:13:07,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:07,189 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 894 transitions. [2022-01-31 21:13:07,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.4431818181818181) internal successors, (127), 86 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:07,189 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 894 transitions. [2022-01-31 21:13:07,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-01-31 21:13:07,190 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:07,190 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:07,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-01-31 21:13:07,190 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:07,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:07,191 INFO L85 PathProgramCache]: Analyzing trace with hash 712622247, now seen corresponding path program 44 times [2022-01-31 21:13:07,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:07,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027833260] [2022-01-31 21:13:07,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:07,242 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 21:13:07,277 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:07,277 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:07,320 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:07,357 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 21:13:07,357 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:07,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:07,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:07,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:07,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:07,451 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 21:13:10,986 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:10,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027833260] [2022-01-31 21:13:10,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1027833260] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:10,986 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:10,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2022-01-31 21:13:10,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322754555] [2022-01-31 21:13:10,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:10,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2022-01-31 21:13:10,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:10,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2022-01-31 21:13:10,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=8075, Unknown=0, NotChecked=0, Total=8556 [2022-01-31 21:13:10,988 INFO L87 Difference]: Start difference. First operand 812 states and 894 transitions. Second operand has 90 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:16,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:16,555 INFO L93 Difference]: Finished difference Result 1047 states and 1178 transitions. [2022-01-31 21:13:16,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2022-01-31 21:13:16,556 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2022-01-31 21:13:16,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:16,558 INFO L225 Difference]: With dead ends: 1047 [2022-01-31 21:13:16,558 INFO L226 Difference]: Without dead ends: 919 [2022-01-31 21:13:16,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3547 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=672, Invalid=13134, Unknown=0, NotChecked=0, Total=13806 [2022-01-31 21:13:16,559 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 131 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 10427 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 10502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 10427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:16,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 88 Invalid, 10502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 10427 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-01-31 21:13:16,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2022-01-31 21:13:17,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 762. [2022-01-31 21:13:17,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 754 states have (on average 1.110079575596817) internal successors, (837), 755 states have internal predecessors, (837), 4 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 21:13:17,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 844 transitions. [2022-01-31 21:13:17,476 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 844 transitions. Word has length 134 [2022-01-31 21:13:17,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:17,477 INFO L470 AbstractCegarLoop]: Abstraction has 762 states and 844 transitions. [2022-01-31 21:13:17,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 1.4444444444444444) internal successors, (130), 88 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:17,477 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 844 transitions. [2022-01-31 21:13:17,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:13:17,478 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:17,478 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:17,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-01-31 21:13:17,478 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:17,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:17,478 INFO L85 PathProgramCache]: Analyzing trace with hash -718368346, now seen corresponding path program 18 times [2022-01-31 21:13:17,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:17,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999610535] [2022-01-31 21:13:17,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:17,501 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 21:13:17,501 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:13:17,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:17,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:17,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:17,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:17,679 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 21:13:18,197 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:18,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999610535] [2022-01-31 21:13:18,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [999610535] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:18,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:18,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:13:18,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387202988] [2022-01-31 21:13:18,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:18,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:13:18,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:18,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:13:18,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1387, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:13:18,199 INFO L87 Difference]: Start difference. First operand 762 states and 844 transitions. Second operand has 44 states, 44 states have (on average 2.9318181818181817) internal successors, (129), 43 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:13:19,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:19,855 INFO L93 Difference]: Finished difference Result 1116 states and 1249 transitions. [2022-01-31 21:13:19,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:13:19,856 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.9318181818181817) internal successors, (129), 43 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 137 [2022-01-31 21:13:19,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:19,858 INFO L225 Difference]: With dead ends: 1116 [2022-01-31 21:13:19,858 INFO L226 Difference]: Without dead ends: 980 [2022-01-31 21:13:19,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 27 SyntacticMatches, 29 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1967 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=505, Invalid=1387, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:13:19,859 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 133 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1077 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:19,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 43 Invalid, 1094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1077 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:13:19,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 980 states. [2022-01-31 21:13:20,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 980 to 824. [2022-01-31 21:13:20,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 824 states, 816 states have (on average 1.1041666666666667) internal successors, (901), 817 states have internal predecessors, (901), 4 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 21:13:20,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 824 states to 824 states and 908 transitions. [2022-01-31 21:13:20,890 INFO L78 Accepts]: Start accepts. Automaton has 824 states and 908 transitions. Word has length 137 [2022-01-31 21:13:20,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:20,890 INFO L470 AbstractCegarLoop]: Abstraction has 824 states and 908 transitions. [2022-01-31 21:13:20,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.9318181818181817) internal successors, (129), 43 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:13:20,890 INFO L276 IsEmpty]: Start isEmpty. Operand 824 states and 908 transitions. [2022-01-31 21:13:20,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:13:20,891 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:20,891 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:20,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-01-31 21:13:20,892 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:20,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:20,892 INFO L85 PathProgramCache]: Analyzing trace with hash -498486876, now seen corresponding path program 45 times [2022-01-31 21:13:20,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:20,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98648535] [2022-01-31 21:13:20,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:20,935 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:20,970 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:20,970 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:21,022 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:21,057 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:21,057 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:21,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:21,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:21,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:21,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:21,165 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 21:13:24,872 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:24,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98648535] [2022-01-31 21:13:24,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [98648535] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:24,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:24,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2022-01-31 21:13:24,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366795430] [2022-01-31 21:13:24,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:24,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-01-31 21:13:24,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:24,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-01-31 21:13:24,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=491, Invalid=8439, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:13:24,873 INFO L87 Difference]: Start difference. First operand 824 states and 908 transitions. Second operand has 92 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:30,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:30,771 INFO L93 Difference]: Finished difference Result 1118 states and 1252 transitions. [2022-01-31 21:13:30,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-01-31 21:13:30,772 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2022-01-31 21:13:30,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:30,774 INFO L225 Difference]: With dead ends: 1118 [2022-01-31 21:13:30,774 INFO L226 Difference]: Without dead ends: 984 [2022-01-31 21:13:30,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3668 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=682, Invalid=13598, Unknown=0, NotChecked=0, Total=14280 [2022-01-31 21:13:30,775 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 132 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 10476 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 10552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 10476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:30,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 108 Invalid, 10552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 10476 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-01-31 21:13:30,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2022-01-31 21:13:31,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 827. [2022-01-31 21:13:31,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 819 states have (on average 1.1037851037851039) internal successors, (904), 820 states have internal predecessors, (904), 4 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 21:13:31,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 911 transitions. [2022-01-31 21:13:31,854 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 911 transitions. Word has length 137 [2022-01-31 21:13:31,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:31,854 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 911 transitions. [2022-01-31 21:13:31,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.4456521739130435) internal successors, (133), 90 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 911 transitions. [2022-01-31 21:13:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:13:31,855 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:31,855 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:31,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-01-31 21:13:31,855 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:31,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:31,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1016880536, now seen corresponding path program 46 times [2022-01-31 21:13:31,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:31,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839010131] [2022-01-31 21:13:31,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:31,902 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:31,937 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:31,937 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:31,979 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:32,015 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 21:13:32,015 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:32,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:32,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:32,095 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:32,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:32,097 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 21:13:35,839 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:35,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839010131] [2022-01-31 21:13:35,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1839010131] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:35,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:35,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2022-01-31 21:13:35,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315198394] [2022-01-31 21:13:35,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:35,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-01-31 21:13:35,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:35,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-01-31 21:13:35,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=8616, Unknown=0, NotChecked=0, Total=9120 [2022-01-31 21:13:35,840 INFO L87 Difference]: Start difference. First operand 827 states and 911 transitions. Second operand has 93 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:43,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:43,883 INFO L93 Difference]: Finished difference Result 1139 states and 1274 transitions. [2022-01-31 21:13:43,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-01-31 21:13:43,883 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2022-01-31 21:13:43,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:43,885 INFO L225 Difference]: With dead ends: 1139 [2022-01-31 21:13:43,885 INFO L226 Difference]: Without dead ends: 1005 [2022-01-31 21:13:43,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5421 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=858, Invalid=18882, Unknown=0, NotChecked=0, Total=19740 [2022-01-31 21:13:43,886 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 141 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 14248 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 14377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 14248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:43,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 321 Invalid, 14377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 14248 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-01-31 21:13:43,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1005 states. [2022-01-31 21:13:44,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1005 to 827. [2022-01-31 21:13:44,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 819 states have (on average 1.105006105006105) internal successors, (905), 820 states have internal predecessors, (905), 4 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 21:13:44,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 912 transitions. [2022-01-31 21:13:44,980 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 912 transitions. Word has length 137 [2022-01-31 21:13:44,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:44,980 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 912 transitions. [2022-01-31 21:13:44,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.4301075268817205) internal successors, (133), 91 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:44,980 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 912 transitions. [2022-01-31 21:13:44,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-01-31 21:13:44,981 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:44,981 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:44,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-01-31 21:13:44,981 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:44,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:44,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1369883527, now seen corresponding path program 47 times [2022-01-31 21:13:44,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:44,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283656794] [2022-01-31 21:13:44,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:45,018 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:45,053 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 21:13:45,053 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:45,097 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 21:13:45,133 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:13:45,133 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:13:45,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:45,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:45,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:45,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:45,213 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 21:13:48,319 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:48,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283656794] [2022-01-31 21:13:48,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [283656794] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:48,319 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:48,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2022-01-31 21:13:48,319 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42793132] [2022-01-31 21:13:48,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:48,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-01-31 21:13:48,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:48,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-01-31 21:13:48,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=8526, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:13:48,321 INFO L87 Difference]: Start difference. First operand 827 states and 912 transitions. Second operand has 94 states, 94 states have (on average 1.446808510638298) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:55,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:55,753 INFO L93 Difference]: Finished difference Result 1148 states and 1286 transitions. [2022-01-31 21:13:55,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-01-31 21:13:55,753 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.446808510638298) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2022-01-31 21:13:55,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:55,755 INFO L225 Difference]: With dead ends: 1148 [2022-01-31 21:13:55,756 INFO L226 Difference]: Without dead ends: 1014 [2022-01-31 21:13:55,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4928 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=713, Invalid=18747, Unknown=0, NotChecked=0, Total=19460 [2022-01-31 21:13:55,757 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 262 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 13353 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 13535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 13353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:55,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 133 Invalid, 13535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 13353 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-01-31 21:13:55,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1014 states. [2022-01-31 21:13:57,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1014 to 886. [2022-01-31 21:13:57,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 886 states, 878 states have (on average 1.1002277904328017) internal successors, (966), 879 states have internal predecessors, (966), 4 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 21:13:57,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 886 states to 886 states and 973 transitions. [2022-01-31 21:13:57,018 INFO L78 Accepts]: Start accepts. Automaton has 886 states and 973 transitions. Word has length 140 [2022-01-31 21:13:57,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:13:57,018 INFO L470 AbstractCegarLoop]: Abstraction has 886 states and 973 transitions. [2022-01-31 21:13:57,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.446808510638298) internal successors, (136), 92 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:13:57,019 INFO L276 IsEmpty]: Start isEmpty. Operand 886 states and 973 transitions. [2022-01-31 21:13:57,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-01-31 21:13:57,020 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:13:57,020 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 38, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:13:57,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-01-31 21:13:57,020 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:13:57,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:13:57,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1447343230, now seen corresponding path program 19 times [2022-01-31 21:13:57,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:13:57,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374667552] [2022-01-31 21:13:57,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:13:57,035 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 21:13:57,035 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:13:57,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:13:57,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:57,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:13:57,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:13:57,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:13:57,741 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:13:57,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374667552] [2022-01-31 21:13:57,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [374667552] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:13:57,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:13:57,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:13:57,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576275927] [2022-01-31 21:13:57,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:13:57,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:13:57,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:13:57,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:13:57,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=1519, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:13:57,742 INFO L87 Difference]: Start difference. First operand 886 states and 973 transitions. Second operand has 46 states, 46 states have (on average 2.9347826086956523) internal successors, (135), 45 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:13:59,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:13:59,689 INFO L93 Difference]: Finished difference Result 1204 states and 1344 transitions. [2022-01-31 21:13:59,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:13:59,689 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.9347826086956523) internal successors, (135), 45 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 143 [2022-01-31 21:13:59,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:13:59,691 INFO L225 Difference]: With dead ends: 1204 [2022-01-31 21:13:59,691 INFO L226 Difference]: Without dead ends: 1062 [2022-01-31 21:13:59,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 31 SyntacticMatches, 27 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=551, Invalid=1519, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:13:59,692 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 146 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1127 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:13:59,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 43 Invalid, 1145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1127 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:13:59,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1062 states. [2022-01-31 21:14:01,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1062 to 954. [2022-01-31 21:14:01,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 954 states, 946 states have (on average 1.095137420718816) internal successors, (1036), 947 states have internal predecessors, (1036), 4 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 21:14:01,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 954 states to 954 states and 1043 transitions. [2022-01-31 21:14:01,106 INFO L78 Accepts]: Start accepts. Automaton has 954 states and 1043 transitions. Word has length 143 [2022-01-31 21:14:01,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:14:01,106 INFO L470 AbstractCegarLoop]: Abstraction has 954 states and 1043 transitions. [2022-01-31 21:14:01,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.9347826086956523) internal successors, (135), 45 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:14:01,106 INFO L276 IsEmpty]: Start isEmpty. Operand 954 states and 1043 transitions. [2022-01-31 21:14:01,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-01-31 21:14:01,108 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:14:01,108 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:14:01,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-01-31 21:14:01,108 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:14:01,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:14:01,108 INFO L85 PathProgramCache]: Analyzing trace with hash -783596860, now seen corresponding path program 48 times [2022-01-31 21:14:01,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:14:01,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786862276] [2022-01-31 21:14:01,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:14:01,141 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:01,177 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 21:14:01,177 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:01,222 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 21:14:01,257 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:01,257 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:01,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:14:01,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:01,344 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:14:01,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:01,346 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 21:14:04,656 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:14:04,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786862276] [2022-01-31 21:14:04,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [786862276] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:14:04,657 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:14:04,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2022-01-31 21:14:04,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118214252] [2022-01-31 21:14:04,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:14:04,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-01-31 21:14:04,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:14:04,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-01-31 21:14:04,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=8899, Unknown=0, NotChecked=0, Total=9312 [2022-01-31 21:14:04,658 INFO L87 Difference]: Start difference. First operand 954 states and 1043 transitions. Second operand has 96 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:12,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:14:12,395 INFO L93 Difference]: Finished difference Result 1159 states and 1278 transitions. [2022-01-31 21:14:12,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2022-01-31 21:14:12,395 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2022-01-31 21:14:12,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:14:12,397 INFO L225 Difference]: With dead ends: 1159 [2022-01-31 21:14:12,397 INFO L226 Difference]: Without dead ends: 1019 [2022-01-31 21:14:12,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5152 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=729, Invalid=19577, Unknown=0, NotChecked=0, Total=20306 [2022-01-31 21:14:12,398 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 258 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 14063 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 14248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 14063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:14:12,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 168 Invalid, 14248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 14063 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-01-31 21:14:12,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2022-01-31 21:14:13,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 957. [2022-01-31 21:14:13,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 957 states, 949 states have (on average 1.095890410958904) internal successors, (1040), 950 states have internal predecessors, (1040), 4 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 21:14:13,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 957 states to 957 states and 1047 transitions. [2022-01-31 21:14:13,839 INFO L78 Accepts]: Start accepts. Automaton has 957 states and 1047 transitions. Word has length 143 [2022-01-31 21:14:13,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:14:13,839 INFO L470 AbstractCegarLoop]: Abstraction has 957 states and 1047 transitions. [2022-01-31 21:14:13,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 94 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:13,840 INFO L276 IsEmpty]: Start isEmpty. Operand 957 states and 1047 transitions. [2022-01-31 21:14:13,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-01-31 21:14:13,841 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:14:13,841 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:14:13,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-01-31 21:14:13,841 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:14:13,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:14:13,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1191305625, now seen corresponding path program 49 times [2022-01-31 21:14:13,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:14:13,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002914219] [2022-01-31 21:14:13,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:14:13,878 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 21:14:13,913 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:13,913 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:13,957 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:13,991 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:13,991 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:13,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:14:13,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:14,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:14:14,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:14,064 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 21:14:17,415 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:14:17,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002914219] [2022-01-31 21:14:17,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2002914219] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:14:17,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:14:17,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2022-01-31 21:14:17,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764192345] [2022-01-31 21:14:17,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:14:17,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-01-31 21:14:17,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:14:17,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-01-31 21:14:17,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=9280, Unknown=0, NotChecked=0, Total=9702 [2022-01-31 21:14:17,416 INFO L87 Difference]: Start difference. First operand 957 states and 1047 transitions. Second operand has 98 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:25,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:14:25,766 INFO L93 Difference]: Finished difference Result 1163 states and 1283 transitions. [2022-01-31 21:14:25,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2022-01-31 21:14:25,766 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2022-01-31 21:14:25,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:14:25,768 INFO L225 Difference]: With dead ends: 1163 [2022-01-31 21:14:25,768 INFO L226 Difference]: Without dead ends: 1023 [2022-01-31 21:14:25,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5381 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=745, Invalid=20425, Unknown=0, NotChecked=0, Total=21170 [2022-01-31 21:14:25,769 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 234 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 16065 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 16254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 16065 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:14:25,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 275 Invalid, 16254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 16065 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-01-31 21:14:25,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2022-01-31 21:14:27,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 960. [2022-01-31 21:14:27,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 960 states, 952 states have (on average 1.096638655462185) internal successors, (1044), 953 states have internal predecessors, (1044), 4 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 21:14:27,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1051 transitions. [2022-01-31 21:14:27,199 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 1051 transitions. Word has length 146 [2022-01-31 21:14:27,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:14:27,199 INFO L470 AbstractCegarLoop]: Abstraction has 960 states and 1051 transitions. [2022-01-31 21:14:27,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 1.4489795918367347) internal successors, (142), 96 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:27,199 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 1051 transitions. [2022-01-31 21:14:27,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-01-31 21:14:27,200 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:14:27,200 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 40, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:14:27,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-01-31 21:14:27,201 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:14:27,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:14:27,201 INFO L85 PathProgramCache]: Analyzing trace with hash -714288538, now seen corresponding path program 20 times [2022-01-31 21:14:27,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:14:27,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688038344] [2022-01-31 21:14:27,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:14:27,220 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:27,220 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:14:27,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:14:27,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:27,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:14:27,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:27,415 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 21:14:27,957 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:14:27,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688038344] [2022-01-31 21:14:27,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1688038344] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:14:27,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:14:27,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:14:27,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107450927] [2022-01-31 21:14:27,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:14:27,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:14:27,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:14:27,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:14:27,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=1657, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:14:27,959 INFO L87 Difference]: Start difference. First operand 960 states and 1051 transitions. Second operand has 48 states, 48 states have (on average 2.9375) internal successors, (141), 47 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:14:30,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:14:30,161 INFO L93 Difference]: Finished difference Result 1292 states and 1438 transitions. [2022-01-31 21:14:30,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:14:30,161 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.9375) internal successors, (141), 47 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 149 [2022-01-31 21:14:30,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:14:30,163 INFO L225 Difference]: With dead ends: 1292 [2022-01-31 21:14:30,163 INFO L226 Difference]: Without dead ends: 1144 [2022-01-31 21:14:30,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 33 SyntacticMatches, 27 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=599, Invalid=1657, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:14:30,163 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 150 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 1368 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:14:30,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 74 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1368 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:14:30,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1144 states. [2022-01-31 21:14:31,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1144 to 1031. [2022-01-31 21:14:31,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1031 states, 1023 states have (on average 1.0918866080156402) internal successors, (1117), 1024 states have internal predecessors, (1117), 4 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 21:14:31,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1031 states to 1031 states and 1124 transitions. [2022-01-31 21:14:31,740 INFO L78 Accepts]: Start accepts. Automaton has 1031 states and 1124 transitions. Word has length 149 [2022-01-31 21:14:31,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:14:31,740 INFO L470 AbstractCegarLoop]: Abstraction has 1031 states and 1124 transitions. [2022-01-31 21:14:31,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.9375) internal successors, (141), 47 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:14:31,741 INFO L276 IsEmpty]: Start isEmpty. Operand 1031 states and 1124 transitions. [2022-01-31 21:14:31,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-01-31 21:14:31,742 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:14:31,742 INFO L514 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:14:31,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-01-31 21:14:31,742 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:14:31,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:14:31,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1075610652, now seen corresponding path program 50 times [2022-01-31 21:14:31,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:14:31,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996856234] [2022-01-31 21:14:31,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:14:31,776 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:31,810 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 21:14:31,810 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:31,854 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:31,888 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:31,888 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:31,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:14:31,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:31,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:14:31,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:31,967 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 21:14:35,441 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:14:35,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996856234] [2022-01-31 21:14:35,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1996856234] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:14:35,441 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:14:35,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2022-01-31 21:14:35,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517966434] [2022-01-31 21:14:35,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:14:35,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-01-31 21:14:35,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:14:35,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-01-31 21:14:35,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=9669, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:14:35,443 INFO L87 Difference]: Start difference. First operand 1031 states and 1124 transitions. Second operand has 100 states, 100 states have (on average 1.45) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:43,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:14:43,865 INFO L93 Difference]: Finished difference Result 1244 states and 1368 transitions. [2022-01-31 21:14:43,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-01-31 21:14:43,865 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.45) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2022-01-31 21:14:43,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:14:43,866 INFO L225 Difference]: With dead ends: 1244 [2022-01-31 21:14:43,867 INFO L226 Difference]: Without dead ends: 1098 [2022-01-31 21:14:43,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5615 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=761, Invalid=21291, Unknown=0, NotChecked=0, Total=22052 [2022-01-31 21:14:43,868 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 255 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 15353 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 15546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 15353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:14:43,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 193 Invalid, 15546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 15353 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-01-31 21:14:43,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1098 states. [2022-01-31 21:14:45,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1098 to 1034. [2022-01-31 21:14:45,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1034 states, 1026 states have (on average 1.0925925925925926) internal successors, (1121), 1027 states have internal predecessors, (1121), 4 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 21:14:45,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1128 transitions. [2022-01-31 21:14:45,461 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1128 transitions. Word has length 149 [2022-01-31 21:14:45,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:14:45,461 INFO L470 AbstractCegarLoop]: Abstraction has 1034 states and 1128 transitions. [2022-01-31 21:14:45,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.45) internal successors, (145), 98 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:45,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1128 transitions. [2022-01-31 21:14:45,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-01-31 21:14:45,462 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:14:45,462 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:14:45,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-01-31 21:14:45,462 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:14:45,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:14:45,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1029558599, now seen corresponding path program 51 times [2022-01-31 21:14:45,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:14:45,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235206173] [2022-01-31 21:14:45,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:14:45,497 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 21:14:45,548 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 21:14:45,549 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:45,592 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:45,627 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:14:45,627 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:14:45,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:14:45,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:45,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:14:45,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:14:45,706 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 21:14:49,315 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:14:49,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235206173] [2022-01-31 21:14:49,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1235206173] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:14:49,315 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:14:49,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2022-01-31 21:14:49,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766387338] [2022-01-31 21:14:49,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:14:49,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-01-31 21:14:49,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:14:49,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-01-31 21:14:49,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=10066, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:14:49,316 INFO L87 Difference]: Start difference. First operand 1034 states and 1128 transitions. Second operand has 102 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:14:58,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:14:58,446 INFO L93 Difference]: Finished difference Result 1248 states and 1373 transitions. [2022-01-31 21:14:58,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2022-01-31 21:14:58,446 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2022-01-31 21:14:58,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:14:58,448 INFO L225 Difference]: With dead ends: 1248 [2022-01-31 21:14:58,448 INFO L226 Difference]: Without dead ends: 1102 [2022-01-31 21:14:58,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5854 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=777, Invalid=22175, Unknown=0, NotChecked=0, Total=22952 [2022-01-31 21:14:58,449 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 191 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 17449 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 17645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 17449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:14:58,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 338 Invalid, 17645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 17449 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-01-31 21:14:58,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1102 states. [2022-01-31 21:15:00,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1102 to 1037. [2022-01-31 21:15:00,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1037 states, 1029 states have (on average 1.0932944606413995) internal successors, (1125), 1030 states have internal predecessors, (1125), 4 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 21:15:00,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1037 states to 1037 states and 1132 transitions. [2022-01-31 21:15:00,058 INFO L78 Accepts]: Start accepts. Automaton has 1037 states and 1132 transitions. Word has length 152 [2022-01-31 21:15:00,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:15:00,058 INFO L470 AbstractCegarLoop]: Abstraction has 1037 states and 1132 transitions. [2022-01-31 21:15:00,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.4509803921568627) internal successors, (148), 100 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:00,059 INFO L276 IsEmpty]: Start isEmpty. Operand 1037 states and 1132 transitions. [2022-01-31 21:15:00,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-01-31 21:15:00,060 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:15:00,060 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 42, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:15:00,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-01-31 21:15:00,060 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:15:00,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:15:00,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1973313346, now seen corresponding path program 21 times [2022-01-31 21:15:00,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:15:00,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823938908] [2022-01-31 21:15:00,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:15:00,077 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 21:15:00,077 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:15:00,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:15:00,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:00,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:15:00,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:00,300 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 21:15:00,941 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:15:00,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823938908] [2022-01-31 21:15:00,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1823938908] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:15:00,942 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:15:00,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:15:00,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680972476] [2022-01-31 21:15:00,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:15:00,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:15:00,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:15:00,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:15:00,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=1801, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:15:00,943 INFO L87 Difference]: Start difference. First operand 1037 states and 1132 transitions. Second operand has 50 states, 50 states have (on average 2.94) internal successors, (147), 49 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:15:03,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:15:03,413 INFO L93 Difference]: Finished difference Result 1383 states and 1535 transitions. [2022-01-31 21:15:03,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-01-31 21:15:03,414 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.94) internal successors, (147), 49 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 155 [2022-01-31 21:15:03,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:15:03,415 INFO L225 Difference]: With dead ends: 1383 [2022-01-31 21:15:03,415 INFO L226 Difference]: Without dead ends: 1229 [2022-01-31 21:15:03,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 31 SyntacticMatches, 31 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=649, Invalid=1801, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:15:03,416 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 183 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1272 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:15:03,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 42 Invalid, 1293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1272 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:15:03,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1229 states. [2022-01-31 21:15:05,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1229 to 1111. [2022-01-31 21:15:05,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1111 states, 1103 states have (on average 1.0888485947416138) internal successors, (1201), 1104 states have internal predecessors, (1201), 4 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 21:15:05,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1111 states to 1111 states and 1208 transitions. [2022-01-31 21:15:05,304 INFO L78 Accepts]: Start accepts. Automaton has 1111 states and 1208 transitions. Word has length 155 [2022-01-31 21:15:05,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:15:05,304 INFO L470 AbstractCegarLoop]: Abstraction has 1111 states and 1208 transitions. [2022-01-31 21:15:05,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.94) internal successors, (147), 49 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:15:05,304 INFO L276 IsEmpty]: Start isEmpty. Operand 1111 states and 1208 transitions. [2022-01-31 21:15:05,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-01-31 21:15:05,306 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:15:05,306 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:15:05,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-01-31 21:15:05,306 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:15:05,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:15:05,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1014258948, now seen corresponding path program 52 times [2022-01-31 21:15:05,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:15:05,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154397242] [2022-01-31 21:15:05,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:15:05,353 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:05,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:05,390 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:05,424 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:05,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:05,460 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:05,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:15:05,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:05,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:15:05,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:05,537 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 21:15:09,497 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:15:09,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154397242] [2022-01-31 21:15:09,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1154397242] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:15:09,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:15:09,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2022-01-31 21:15:09,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103644906] [2022-01-31 21:15:09,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:15:09,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-01-31 21:15:09,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:15:09,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-01-31 21:15:09,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=10471, Unknown=0, NotChecked=0, Total=10920 [2022-01-31 21:15:09,499 INFO L87 Difference]: Start difference. First operand 1111 states and 1208 transitions. Second operand has 104 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:20,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:15:20,139 INFO L93 Difference]: Finished difference Result 1332 states and 1461 transitions. [2022-01-31 21:15:20,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2022-01-31 21:15:20,140 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2022-01-31 21:15:20,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:15:20,141 INFO L225 Difference]: With dead ends: 1332 [2022-01-31 21:15:20,141 INFO L226 Difference]: Without dead ends: 1180 [2022-01-31 21:15:20,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6098 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=793, Invalid=23077, Unknown=0, NotChecked=0, Total=23870 [2022-01-31 21:15:20,143 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 209 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 20470 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 20670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 20470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:15:20,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 383 Invalid, 20670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 20470 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-01-31 21:15:20,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1180 states. [2022-01-31 21:15:22,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1180 to 1114. [2022-01-31 21:15:22,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1114 states, 1106 states have (on average 1.089511754068716) internal successors, (1205), 1107 states have internal predecessors, (1205), 4 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 21:15:22,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1114 states to 1114 states and 1212 transitions. [2022-01-31 21:15:22,110 INFO L78 Accepts]: Start accepts. Automaton has 1114 states and 1212 transitions. Word has length 155 [2022-01-31 21:15:22,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:15:22,111 INFO L470 AbstractCegarLoop]: Abstraction has 1114 states and 1212 transitions. [2022-01-31 21:15:22,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.4519230769230769) internal successors, (151), 102 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:22,111 INFO L276 IsEmpty]: Start isEmpty. Operand 1114 states and 1212 transitions. [2022-01-31 21:15:22,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2022-01-31 21:15:22,113 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:15:22,113 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:15:22,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-01-31 21:15:22,113 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:15:22,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:15:22,114 INFO L85 PathProgramCache]: Analyzing trace with hash 488889383, now seen corresponding path program 53 times [2022-01-31 21:15:22,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:15:22,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [297154762] [2022-01-31 21:15:22,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:15:22,163 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:22,200 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 21:15:22,200 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:22,234 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 21:15:22,272 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 21:15:22,272 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:22,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:15:22,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:22,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:15:22,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:22,368 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 21:15:26,334 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:15:26,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [297154762] [2022-01-31 21:15:26,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [297154762] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:15:26,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:15:26,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2022-01-31 21:15:26,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392981966] [2022-01-31 21:15:26,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:15:26,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-01-31 21:15:26,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:15:26,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-01-31 21:15:26,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=10884, Unknown=0, NotChecked=0, Total=11342 [2022-01-31 21:15:26,336 INFO L87 Difference]: Start difference. First operand 1114 states and 1212 transitions. Second operand has 106 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:36,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:15:36,504 INFO L93 Difference]: Finished difference Result 1336 states and 1466 transitions. [2022-01-31 21:15:36,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2022-01-31 21:15:36,505 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2022-01-31 21:15:36,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:15:36,506 INFO L225 Difference]: With dead ends: 1336 [2022-01-31 21:15:36,506 INFO L226 Difference]: Without dead ends: 1184 [2022-01-31 21:15:36,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6347 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=809, Invalid=23997, Unknown=0, NotChecked=0, Total=24806 [2022-01-31 21:15:36,508 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 249 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 18537 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 18742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 18537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:15:36,508 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 304 Invalid, 18742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 18537 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2022-01-31 21:15:36,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1184 states. [2022-01-31 21:15:38,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1184 to 1117. [2022-01-31 21:15:38,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1117 states, 1109 states have (on average 1.090171325518485) internal successors, (1209), 1110 states have internal predecessors, (1209), 4 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 21:15:38,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1117 states to 1117 states and 1216 transitions. [2022-01-31 21:15:38,424 INFO L78 Accepts]: Start accepts. Automaton has 1117 states and 1216 transitions. Word has length 158 [2022-01-31 21:15:38,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:15:38,424 INFO L470 AbstractCegarLoop]: Abstraction has 1117 states and 1216 transitions. [2022-01-31 21:15:38,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.4528301886792452) internal successors, (154), 104 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:38,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1117 states and 1216 transitions. [2022-01-31 21:15:38,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-01-31 21:15:38,426 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:15:38,426 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 44, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:15:38,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-01-31 21:15:38,426 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:15:38,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:15:38,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1132122918, now seen corresponding path program 22 times [2022-01-31 21:15:38,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:15:38,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85206809] [2022-01-31 21:15:38,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:15:38,452 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:15:38,452 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:15:38,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:15:38,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:38,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:15:38,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:38,686 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 21:15:39,420 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:15:39,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85206809] [2022-01-31 21:15:39,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [85206809] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:15:39,420 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:15:39,420 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:15:39,420 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744845578] [2022-01-31 21:15:39,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:15:39,421 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:15:39,421 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:15:39,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:15:39,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=701, Invalid=1951, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:15:39,421 INFO L87 Difference]: Start difference. First operand 1117 states and 1216 transitions. Second operand has 52 states, 52 states have (on average 2.9423076923076925) internal successors, (153), 51 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:15:42,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:15:42,228 INFO L93 Difference]: Finished difference Result 1477 states and 1635 transitions. [2022-01-31 21:15:42,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:15:42,228 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.9423076923076925) internal successors, (153), 51 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 161 [2022-01-31 21:15:42,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:15:42,230 INFO L225 Difference]: With dead ends: 1477 [2022-01-31 21:15:42,230 INFO L226 Difference]: Without dead ends: 1317 [2022-01-31 21:15:42,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 30 SyntacticMatches, 34 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2747 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=701, Invalid=1951, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:15:42,231 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 173 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1350 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:15:42,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 43 Invalid, 1374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1350 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:15:42,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2022-01-31 21:15:44,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1194. [2022-01-31 21:15:44,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1194 states, 1186 states have (on average 1.0860033726812817) internal successors, (1288), 1187 states have internal predecessors, (1288), 4 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 21:15:44,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1194 states to 1194 states and 1295 transitions. [2022-01-31 21:15:44,333 INFO L78 Accepts]: Start accepts. Automaton has 1194 states and 1295 transitions. Word has length 161 [2022-01-31 21:15:44,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:15:44,333 INFO L470 AbstractCegarLoop]: Abstraction has 1194 states and 1295 transitions. [2022-01-31 21:15:44,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.9423076923076925) internal successors, (153), 51 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:15:44,333 INFO L276 IsEmpty]: Start isEmpty. Operand 1194 states and 1295 transitions. [2022-01-31 21:15:44,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-01-31 21:15:44,335 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:15:44,335 INFO L514 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:15:44,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-01-31 21:15:44,335 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:15:44,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:15:44,335 INFO L85 PathProgramCache]: Analyzing trace with hash 65005092, now seen corresponding path program 54 times [2022-01-31 21:15:44,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:15:44,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1130469937] [2022-01-31 21:15:44,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:15:44,384 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 21:15:44,421 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 21:15:44,421 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:44,455 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 21:15:44,492 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 21:15:44,492 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:15:44,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:15:44,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:44,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:15:44,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:15:44,597 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 21:15:49,596 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:15:49,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1130469937] [2022-01-31 21:15:49,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1130469937] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:15:49,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:15:49,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2022-01-31 21:15:49,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251496103] [2022-01-31 21:15:49,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:15:49,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-01-31 21:15:49,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:15:49,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-01-31 21:15:49,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=11631, Unknown=0, NotChecked=0, Total=12210 [2022-01-31 21:15:49,598 INFO L87 Difference]: Start difference. First operand 1194 states and 1295 transitions. Second operand has 108 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:15:58,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:15:58,533 INFO L93 Difference]: Finished difference Result 1475 states and 1634 transitions. [2022-01-31 21:15:58,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2022-01-31 21:15:58,538 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2022-01-31 21:15:58,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:15:58,539 INFO L225 Difference]: With dead ends: 1475 [2022-01-31 21:15:58,539 INFO L226 Difference]: Without dead ends: 1317 [2022-01-31 21:15:58,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5010 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=802, Invalid=18658, Unknown=0, NotChecked=0, Total=19460 [2022-01-31 21:15:58,541 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 155 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 14591 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 14679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 14591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:15:58,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 93 Invalid, 14679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 14591 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-01-31 21:15:58,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2022-01-31 21:16:00,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1129. [2022-01-31 21:16:00,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1129 states, 1121 states have (on average 1.0909901873327386) internal successors, (1223), 1122 states have internal predecessors, (1223), 4 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 21:16:00,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1129 states to 1129 states and 1230 transitions. [2022-01-31 21:16:00,548 INFO L78 Accepts]: Start accepts. Automaton has 1129 states and 1230 transitions. Word has length 161 [2022-01-31 21:16:00,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:16:00,548 INFO L470 AbstractCegarLoop]: Abstraction has 1129 states and 1230 transitions. [2022-01-31 21:16:00,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.4537037037037037) internal successors, (157), 106 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:00,548 INFO L276 IsEmpty]: Start isEmpty. Operand 1129 states and 1230 transitions. [2022-01-31 21:16:00,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-01-31 21:16:00,550 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:16:00,550 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:16:00,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-01-31 21:16:00,550 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:16:00,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:16:00,551 INFO L85 PathProgramCache]: Analyzing trace with hash -668057849, now seen corresponding path program 55 times [2022-01-31 21:16:00,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:16:00,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190425604] [2022-01-31 21:16:00,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:16:00,597 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 21:16:00,639 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 21:16:00,639 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:00,686 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:00,723 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 21:16:00,723 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:00,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:16:00,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:00,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:16:00,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:00,800 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 21:16:05,103 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:16:05,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190425604] [2022-01-31 21:16:05,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1190425604] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:16:05,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:16:05,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2022-01-31 21:16:05,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150781851] [2022-01-31 21:16:05,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:16:05,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-01-31 21:16:05,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:16:05,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-01-31 21:16:05,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=11734, Unknown=0, NotChecked=0, Total=12210 [2022-01-31 21:16:05,105 INFO L87 Difference]: Start difference. First operand 1129 states and 1230 transitions. Second operand has 110 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:16,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:16:16,578 INFO L93 Difference]: Finished difference Result 1506 states and 1668 transitions. [2022-01-31 21:16:16,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2022-01-31 21:16:16,579 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2022-01-31 21:16:16,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:16:16,580 INFO L225 Difference]: With dead ends: 1506 [2022-01-31 21:16:16,581 INFO L226 Difference]: Without dead ends: 1348 [2022-01-31 21:16:16,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6860 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=841, Invalid=25891, Unknown=0, NotChecked=0, Total=26732 [2022-01-31 21:16:16,582 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 299 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 19669 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 19885 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 19669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:16:16,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 206 Invalid, 19885 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 19669 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2022-01-31 21:16:16,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1348 states. [2022-01-31 21:16:18,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1348 to 1200. [2022-01-31 21:16:18,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1200 states, 1192 states have (on average 1.087248322147651) internal successors, (1296), 1193 states have internal predecessors, (1296), 4 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 21:16:18,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 1303 transitions. [2022-01-31 21:16:18,791 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 1303 transitions. Word has length 164 [2022-01-31 21:16:18,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:16:18,791 INFO L470 AbstractCegarLoop]: Abstraction has 1200 states and 1303 transitions. [2022-01-31 21:16:18,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.4545454545454546) internal successors, (160), 108 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:18,791 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 1303 transitions. [2022-01-31 21:16:18,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-01-31 21:16:18,792 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:16:18,793 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 46, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:16:18,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2022-01-31 21:16:18,793 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:16:18,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:16:18,793 INFO L85 PathProgramCache]: Analyzing trace with hash -278203646, now seen corresponding path program 23 times [2022-01-31 21:16:18,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:16:18,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015280813] [2022-01-31 21:16:18,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:16:18,811 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 21:16:18,812 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:16:18,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:16:18,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:19,075 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:16:19,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:19,077 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 21:16:19,750 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:16:19,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015280813] [2022-01-31 21:16:19,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1015280813] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:16:19,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:16:19,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-01-31 21:16:19,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132278847] [2022-01-31 21:16:19,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:16:19,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-01-31 21:16:19,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:16:19,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-01-31 21:16:19,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:16:19,752 INFO L87 Difference]: Start difference. First operand 1200 states and 1303 transitions. Second operand has 54 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 53 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:16:23,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:16:23,064 INFO L93 Difference]: Finished difference Result 1574 states and 1738 transitions. [2022-01-31 21:16:23,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-01-31 21:16:23,065 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 53 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 167 [2022-01-31 21:16:23,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:16:23,066 INFO L225 Difference]: With dead ends: 1574 [2022-01-31 21:16:23,066 INFO L226 Difference]: Without dead ends: 1408 [2022-01-31 21:16:23,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 37 SyntacticMatches, 29 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2717 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:16:23,067 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 199 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1511 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:16:23,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 47 Invalid, 1532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1511 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:16:23,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1408 states. [2022-01-31 21:16:25,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1408 to 1280. [2022-01-31 21:16:25,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1272 states have (on average 1.0833333333333333) internal successors, (1378), 1273 states have internal predecessors, (1378), 4 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 21:16:25,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 1385 transitions. [2022-01-31 21:16:25,445 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 1385 transitions. Word has length 167 [2022-01-31 21:16:25,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:16:25,445 INFO L470 AbstractCegarLoop]: Abstraction has 1280 states and 1385 transitions. [2022-01-31 21:16:25,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 53 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:16:25,445 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 1385 transitions. [2022-01-31 21:16:25,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-01-31 21:16:25,447 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:16:25,447 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:16:25,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2022-01-31 21:16:25,447 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:16:25,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:16:25,447 INFO L85 PathProgramCache]: Analyzing trace with hash 562566980, now seen corresponding path program 56 times [2022-01-31 21:16:25,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:16:25,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150846041] [2022-01-31 21:16:25,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:16:25,490 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:25,531 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 21:16:25,531 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:25,579 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:25,614 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:25,614 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:25,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:16:25,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:25,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:16:25,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:25,713 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 21:16:31,045 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:16:31,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150846041] [2022-01-31 21:16:31,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [150846041] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:16:31,045 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:16:31,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2022-01-31 21:16:31,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097101634] [2022-01-31 21:16:31,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:16:31,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-01-31 21:16:31,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:16:31,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-01-31 21:16:31,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=12509, Unknown=0, NotChecked=0, Total=13110 [2022-01-31 21:16:31,047 INFO L87 Difference]: Start difference. First operand 1280 states and 1385 transitions. Second operand has 112 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:40,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:16:40,922 INFO L93 Difference]: Finished difference Result 1571 states and 1736 transitions. [2022-01-31 21:16:40,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2022-01-31 21:16:40,923 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2022-01-31 21:16:40,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:16:40,925 INFO L225 Difference]: With dead ends: 1571 [2022-01-31 21:16:40,925 INFO L226 Difference]: Without dead ends: 1407 [2022-01-31 21:16:40,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5378 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=832, Invalid=20048, Unknown=0, NotChecked=0, Total=20880 [2022-01-31 21:16:40,926 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 155 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 15832 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 15922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 15832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:16:40,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 108 Invalid, 15922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 15832 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:16:40,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1407 states. [2022-01-31 21:16:43,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1407 to 1212. [2022-01-31 21:16:43,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1212 states, 1204 states have (on average 1.0880398671096345) internal successors, (1310), 1205 states have internal predecessors, (1310), 4 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 21:16:43,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1212 states to 1212 states and 1317 transitions. [2022-01-31 21:16:43,092 INFO L78 Accepts]: Start accepts. Automaton has 1212 states and 1317 transitions. Word has length 167 [2022-01-31 21:16:43,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:16:43,093 INFO L470 AbstractCegarLoop]: Abstraction has 1212 states and 1317 transitions. [2022-01-31 21:16:43,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.4553571428571428) internal successors, (163), 110 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:43,093 INFO L276 IsEmpty]: Start isEmpty. Operand 1212 states and 1317 transitions. [2022-01-31 21:16:43,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2022-01-31 21:16:43,094 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:16:43,094 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:16:43,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2022-01-31 21:16:43,094 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:16:43,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:16:43,095 INFO L85 PathProgramCache]: Analyzing trace with hash 266009063, now seen corresponding path program 57 times [2022-01-31 21:16:43,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:16:43,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76904975] [2022-01-31 21:16:43,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:16:43,139 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 21:16:43,181 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:43,181 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:43,232 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:43,270 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:16:43,270 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:16:43,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:16:43,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:43,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:16:43,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:16:43,373 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 21:16:47,870 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:16:47,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76904975] [2022-01-31 21:16:47,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [76904975] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:16:47,870 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:16:47,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2022-01-31 21:16:47,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521390582] [2022-01-31 21:16:47,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:16:47,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-01-31 21:16:47,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:16:47,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-01-31 21:16:47,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=12615, Unknown=0, NotChecked=0, Total=13110 [2022-01-31 21:16:47,872 INFO L87 Difference]: Start difference. First operand 1212 states and 1317 transitions. Second operand has 114 states, 114 states have (on average 1.456140350877193) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:16:59,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:16:59,166 INFO L93 Difference]: Finished difference Result 1603 states and 1771 transitions. [2022-01-31 21:16:59,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2022-01-31 21:16:59,166 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.456140350877193) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2022-01-31 21:16:59,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:16:59,168 INFO L225 Difference]: With dead ends: 1603 [2022-01-31 21:16:59,168 INFO L226 Difference]: Without dead ends: 1439 [2022-01-31 21:16:59,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7496 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=874, Invalid=27856, Unknown=0, NotChecked=0, Total=28730 [2022-01-31 21:16:59,170 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 343 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 16944 mSolverCounterSat, 225 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 17169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 225 IncrementalHoareTripleChecker+Valid, 16944 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:16:59,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [345 Valid, 81 Invalid, 17169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [225 Valid, 16944 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-01-31 21:16:59,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1439 states. [2022-01-31 21:17:01,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1439 to 1286. [2022-01-31 21:17:01,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1286 states, 1278 states have (on average 1.0845070422535212) internal successors, (1386), 1279 states have internal predecessors, (1386), 4 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 21:17:01,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1286 states to 1286 states and 1393 transitions. [2022-01-31 21:17:01,657 INFO L78 Accepts]: Start accepts. Automaton has 1286 states and 1393 transitions. Word has length 170 [2022-01-31 21:17:01,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:17:01,658 INFO L470 AbstractCegarLoop]: Abstraction has 1286 states and 1393 transitions. [2022-01-31 21:17:01,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 1.456140350877193) internal successors, (166), 112 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:17:01,658 INFO L276 IsEmpty]: Start isEmpty. Operand 1286 states and 1393 transitions. [2022-01-31 21:17:01,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-01-31 21:17:01,659 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:17:01,659 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 48, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:17:01,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2022-01-31 21:17:01,660 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:17:01,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:17:01,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1108382694, now seen corresponding path program 24 times [2022-01-31 21:17:01,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:17:01,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600203576] [2022-01-31 21:17:01,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:17:01,685 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:01,686 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:17:01,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:17:01,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:01,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:17:01,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:01,934 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 21:17:02,786 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:17:02,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600203576] [2022-01-31 21:17:02,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [600203576] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:17:02,786 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:17:02,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-01-31 21:17:02,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541703048] [2022-01-31 21:17:02,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:17:02,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-01-31 21:17:02,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:17:02,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-01-31 21:17:02,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=811, Invalid=2269, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:17:02,787 INFO L87 Difference]: Start difference. First operand 1286 states and 1393 transitions. Second operand has 56 states, 56 states have (on average 2.9464285714285716) internal successors, (165), 55 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:17:06,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:17:06,486 INFO L93 Difference]: Finished difference Result 1674 states and 1844 transitions. [2022-01-31 21:17:06,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-01-31 21:17:06,487 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.9464285714285716) internal successors, (165), 55 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 173 [2022-01-31 21:17:06,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:17:06,489 INFO L225 Difference]: With dead ends: 1674 [2022-01-31 21:17:06,489 INFO L226 Difference]: Without dead ends: 1502 [2022-01-31 21:17:06,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 30 SyntacticMatches, 38 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3287 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=811, Invalid=2269, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:17:06,490 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 174 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1728 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:17:06,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 59 Invalid, 1738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1728 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:17:06,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2022-01-31 21:17:09,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 1369. [2022-01-31 21:17:09,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1369 states, 1361 states have (on average 1.0808229243203527) internal successors, (1471), 1362 states have internal predecessors, (1471), 4 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 21:17:09,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1369 states to 1369 states and 1478 transitions. [2022-01-31 21:17:09,199 INFO L78 Accepts]: Start accepts. Automaton has 1369 states and 1478 transitions. Word has length 173 [2022-01-31 21:17:09,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:17:09,199 INFO L470 AbstractCegarLoop]: Abstraction has 1369 states and 1478 transitions. [2022-01-31 21:17:09,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.9464285714285716) internal successors, (165), 55 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:17:09,199 INFO L276 IsEmpty]: Start isEmpty. Operand 1369 states and 1478 transitions. [2022-01-31 21:17:09,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-01-31 21:17:09,201 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:17:09,201 INFO L514 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:17:09,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2022-01-31 21:17:09,201 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:17:09,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:17:09,201 INFO L85 PathProgramCache]: Analyzing trace with hash 256831588, now seen corresponding path program 58 times [2022-01-31 21:17:09,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:17:09,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60536818] [2022-01-31 21:17:09,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:17:09,241 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 21:17:09,279 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 21:17:09,279 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:09,313 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:09,350 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:09,350 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:09,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:17:09,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:09,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:17:09,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:09,439 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 21:17:15,222 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:17:15,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60536818] [2022-01-31 21:17:15,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [60536818] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:17:15,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:17:15,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2022-01-31 21:17:15,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64783950] [2022-01-31 21:17:15,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:17:15,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-01-31 21:17:15,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:17:15,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-01-31 21:17:15,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=623, Invalid=13419, Unknown=0, NotChecked=0, Total=14042 [2022-01-31 21:17:15,225 INFO L87 Difference]: Start difference. First operand 1369 states and 1478 transitions. Second operand has 116 states, 116 states have (on average 1.456896551724138) internal successors, (169), 114 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:17:25,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:17:25,763 INFO L93 Difference]: Finished difference Result 1670 states and 1841 transitions. [2022-01-31 21:17:25,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2022-01-31 21:17:25,763 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.456896551724138) internal successors, (169), 114 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2022-01-31 21:17:25,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:17:25,765 INFO L225 Difference]: With dead ends: 1670 [2022-01-31 21:17:25,765 INFO L226 Difference]: Without dead ends: 1500 [2022-01-31 21:17:25,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5759 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=862, Invalid=21488, Unknown=0, NotChecked=0, Total=22350 [2022-01-31 21:17:25,766 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 165 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 17693 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 17787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 17693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:17:25,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 173 Invalid, 17787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 17693 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-01-31 21:17:25,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1500 states. [2022-01-31 21:17:28,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1500 to 1298. [2022-01-31 21:17:28,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1298 states, 1290 states have (on average 1.0852713178294573) internal successors, (1400), 1291 states have internal predecessors, (1400), 4 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 21:17:28,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1298 states to 1298 states and 1407 transitions. [2022-01-31 21:17:28,164 INFO L78 Accepts]: Start accepts. Automaton has 1298 states and 1407 transitions. Word has length 173 [2022-01-31 21:17:28,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:17:28,164 INFO L470 AbstractCegarLoop]: Abstraction has 1298 states and 1407 transitions. [2022-01-31 21:17:28,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.456896551724138) internal successors, (169), 114 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:17:28,164 INFO L276 IsEmpty]: Start isEmpty. Operand 1298 states and 1407 transitions. [2022-01-31 21:17:28,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-01-31 21:17:28,166 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:17:28,166 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:17:28,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2022-01-31 21:17:28,166 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:17:28,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:17:28,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1728580807, now seen corresponding path program 59 times [2022-01-31 21:17:28,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:17:28,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505159666] [2022-01-31 21:17:28,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:17:28,211 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 21:17:28,244 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:28,245 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:28,276 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:28,310 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 21:17:28,310 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:28,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:17:28,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:28,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:17:28,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:28,389 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 21:17:34,030 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:17:34,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505159666] [2022-01-31 21:17:34,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1505159666] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:17:34,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:17:34,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [118] imperfect sequences [] total 118 [2022-01-31 21:17:34,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313288449] [2022-01-31 21:17:34,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:17:34,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-01-31 21:17:34,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:17:34,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-01-31 21:17:34,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=13885, Unknown=0, NotChecked=0, Total=14520 [2022-01-31 21:17:34,032 INFO L87 Difference]: Start difference. First operand 1298 states and 1407 transitions. Second operand has 118 states, 118 states have (on average 1.4576271186440677) internal successors, (172), 116 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:17:44,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:17:44,617 INFO L93 Difference]: Finished difference Result 1674 states and 1846 transitions. [2022-01-31 21:17:44,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-01-31 21:17:44,618 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.4576271186440677) internal successors, (172), 116 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2022-01-31 21:17:44,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:17:44,620 INFO L225 Difference]: With dead ends: 1674 [2022-01-31 21:17:44,620 INFO L226 Difference]: Without dead ends: 1504 [2022-01-31 21:17:44,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5997 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=882, Invalid=22374, Unknown=0, NotChecked=0, Total=23256 [2022-01-31 21:17:44,621 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 162 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 17942 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 18038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 17942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:17:44,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 133 Invalid, 18038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 17942 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-01-31 21:17:44,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1504 states. [2022-01-31 21:17:47,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1504 to 1301. [2022-01-31 21:17:47,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1301 states, 1293 states have (on average 1.0850734725444702) internal successors, (1403), 1294 states have internal predecessors, (1403), 4 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 21:17:47,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1301 states to 1301 states and 1410 transitions. [2022-01-31 21:17:47,070 INFO L78 Accepts]: Start accepts. Automaton has 1301 states and 1410 transitions. Word has length 176 [2022-01-31 21:17:47,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:17:47,070 INFO L470 AbstractCegarLoop]: Abstraction has 1301 states and 1410 transitions. [2022-01-31 21:17:47,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.4576271186440677) internal successors, (172), 116 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:17:47,070 INFO L276 IsEmpty]: Start isEmpty. Operand 1301 states and 1410 transitions. [2022-01-31 21:17:47,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-01-31 21:17:47,072 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:17:47,072 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:17:47,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2022-01-31 21:17:47,072 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:17:47,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:17:47,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1332967549, now seen corresponding path program 60 times [2022-01-31 21:17:47,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:17:47,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107555623] [2022-01-31 21:17:47,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:17:47,105 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:47,138 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:47,138 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:47,182 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:47,216 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:17:47,216 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:17:47,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:17:47,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:47,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:17:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:17:47,296 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 21:17:53,032 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:17:53,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107555623] [2022-01-31 21:17:53,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1107555623] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:17:53,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:17:53,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [119] imperfect sequences [] total 119 [2022-01-31 21:17:53,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063236005] [2022-01-31 21:17:53,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:17:53,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-01-31 21:17:53,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:17:53,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-01-31 21:17:53,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=14115, Unknown=0, NotChecked=0, Total=14762 [2022-01-31 21:17:53,034 INFO L87 Difference]: Start difference. First operand 1301 states and 1410 transitions. Second operand has 119 states, 119 states have (on average 1.4453781512605042) internal successors, (172), 117 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:06,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:06,354 INFO L93 Difference]: Finished difference Result 1701 states and 1874 transitions. [2022-01-31 21:18:06,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 173 states. [2022-01-31 21:18:06,355 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.4453781512605042) internal successors, (172), 117 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2022-01-31 21:18:06,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:06,356 INFO L225 Difference]: With dead ends: 1701 [2022-01-31 21:18:06,357 INFO L226 Difference]: Without dead ends: 1531 [2022-01-31 21:18:06,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8879 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1105, Invalid=31115, Unknown=0, NotChecked=0, Total=32220 [2022-01-31 21:18:06,360 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 185 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 21302 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 21471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 21302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:06,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 129 Invalid, 21471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 21302 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-01-31 21:18:06,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1531 states. [2022-01-31 21:18:08,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1531 to 1301. [2022-01-31 21:18:08,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1301 states, 1293 states have (on average 1.08584686774942) internal successors, (1404), 1294 states have internal predecessors, (1404), 4 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 21:18:08,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1301 states to 1301 states and 1411 transitions. [2022-01-31 21:18:08,884 INFO L78 Accepts]: Start accepts. Automaton has 1301 states and 1411 transitions. Word has length 176 [2022-01-31 21:18:08,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:08,884 INFO L470 AbstractCegarLoop]: Abstraction has 1301 states and 1411 transitions. [2022-01-31 21:18:08,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.4453781512605042) internal successors, (172), 117 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:08,884 INFO L276 IsEmpty]: Start isEmpty. Operand 1301 states and 1411 transitions. [2022-01-31 21:18:08,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2022-01-31 21:18:08,886 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:08,886 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 50, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:08,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2022-01-31 21:18:08,886 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:08,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:08,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1770587842, now seen corresponding path program 25 times [2022-01-31 21:18:08,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:08,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978720695] [2022-01-31 21:18:08,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:08,907 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 4 AssignedVariables, 1 ReadonlyVariables, Eigenvalues: {0={1=2}, 1={1=2, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:08,907 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:18:08,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:08,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:09,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:09,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:09,180 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 21:18:09,980 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:09,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978720695] [2022-01-31 21:18:09,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1978720695] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:09,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:09,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-01-31 21:18:09,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753385590] [2022-01-31 21:18:09,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:09,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-01-31 21:18:09,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:09,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-01-31 21:18:09,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=869, Invalid=2437, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:18:09,982 INFO L87 Difference]: Start difference. First operand 1301 states and 1411 transitions. Second operand has 58 states, 58 states have (on average 2.9482758620689653) internal successors, (171), 57 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:18:13,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:13,927 INFO L93 Difference]: Finished difference Result 1774 states and 1949 transitions. [2022-01-31 21:18:13,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-01-31 21:18:13,927 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.9482758620689653) internal successors, (171), 57 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 179 [2022-01-31 21:18:13,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:13,929 INFO L225 Difference]: With dead ends: 1774 [2022-01-31 21:18:13,929 INFO L226 Difference]: Without dead ends: 1596 [2022-01-31 21:18:13,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 32 SyntacticMatches, 38 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3522 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=869, Invalid=2437, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:18:13,929 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 198 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1794 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:13,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 49 Invalid, 1804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1794 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:18:13,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1596 states. [2022-01-31 21:18:16,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1596 to 1384. [2022-01-31 21:18:16,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1384 states, 1376 states have (on average 1.0821220930232558) internal successors, (1489), 1377 states have internal predecessors, (1489), 4 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 21:18:16,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1384 states to 1384 states and 1496 transitions. [2022-01-31 21:18:16,658 INFO L78 Accepts]: Start accepts. Automaton has 1384 states and 1496 transitions. Word has length 179 [2022-01-31 21:18:16,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:16,659 INFO L470 AbstractCegarLoop]: Abstraction has 1384 states and 1496 transitions. [2022-01-31 21:18:16,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.9482758620689653) internal successors, (171), 57 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:18:16,659 INFO L276 IsEmpty]: Start isEmpty. Operand 1384 states and 1496 transitions. [2022-01-31 21:18:16,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2022-01-31 21:18:16,660 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:16,660 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:16,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2022-01-31 21:18:16,661 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:16,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:16,661 INFO L85 PathProgramCache]: Analyzing trace with hash -711560828, now seen corresponding path program 61 times [2022-01-31 21:18:16,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:16,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451637711] [2022-01-31 21:18:16,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:16,708 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:16,745 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 21:18:16,745 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:16,777 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:16,812 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:16,812 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:16,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:16,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:16,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:16,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:16,899 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 21:18:21,854 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:21,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451637711] [2022-01-31 21:18:21,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [451637711] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:21,854 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:21,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2022-01-31 21:18:21,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371935859] [2022-01-31 21:18:21,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:21,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-01-31 21:18:21,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:21,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-01-31 21:18:21,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=13999, Unknown=0, NotChecked=0, Total=14520 [2022-01-31 21:18:21,856 INFO L87 Difference]: Start difference. First operand 1384 states and 1496 transitions. Second operand has 120 states, 120 states have (on average 1.4583333333333333) internal successors, (175), 118 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:35,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:35,613 INFO L93 Difference]: Finished difference Result 1799 states and 1977 transitions. [2022-01-31 21:18:35,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2022-01-31 21:18:35,613 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.4583333333333333) internal successors, (175), 118 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2022-01-31 21:18:35,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:35,615 INFO L225 Difference]: With dead ends: 1799 [2022-01-31 21:18:35,615 INFO L226 Difference]: Without dead ends: 1623 [2022-01-31 21:18:35,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8230 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=921, Invalid=30941, Unknown=0, NotChecked=0, Total=31862 [2022-01-31 21:18:35,617 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 292 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 23939 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 24174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 23939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:35,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [294 Valid, 283 Invalid, 24174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 23939 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-01-31 21:18:35,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1623 states. [2022-01-31 21:18:38,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1623 to 1464. [2022-01-31 21:18:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1464 states, 1456 states have (on average 1.0789835164835164) internal successors, (1571), 1457 states have internal predecessors, (1571), 4 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 21:18:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1464 states to 1464 states and 1578 transitions. [2022-01-31 21:18:38,661 INFO L78 Accepts]: Start accepts. Automaton has 1464 states and 1578 transitions. Word has length 179 [2022-01-31 21:18:38,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:18:38,661 INFO L470 AbstractCegarLoop]: Abstraction has 1464 states and 1578 transitions. [2022-01-31 21:18:38,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 1.4583333333333333) internal successors, (175), 118 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:38,662 INFO L276 IsEmpty]: Start isEmpty. Operand 1464 states and 1578 transitions. [2022-01-31 21:18:38,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-01-31 21:18:38,663 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:18:38,663 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:18:38,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2022-01-31 21:18:38,663 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:18:38,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:18:38,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1645442983, now seen corresponding path program 62 times [2022-01-31 21:18:38,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:18:38,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031401740] [2022-01-31 21:18:38,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:18:38,709 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:38,743 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 21:18:38,743 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:38,786 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:38,821 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:18:38,822 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:18:38,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:18:38,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:38,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:18:38,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:18:38,925 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 21:18:44,985 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:18:44,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031401740] [2022-01-31 21:18:44,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1031401740] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:18:44,985 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:18:44,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [122] imperfect sequences [] total 122 [2022-01-31 21:18:44,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592938496] [2022-01-31 21:18:44,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:18:44,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2022-01-31 21:18:44,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:18:44,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2022-01-31 21:18:44,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=656, Invalid=14844, Unknown=0, NotChecked=0, Total=15500 [2022-01-31 21:18:44,988 INFO L87 Difference]: Start difference. First operand 1464 states and 1578 transitions. Second operand has 122 states, 122 states have (on average 1.459016393442623) internal successors, (178), 120 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:18:57,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:18:57,327 INFO L93 Difference]: Finished difference Result 1779 states and 1958 transitions. [2022-01-31 21:18:57,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2022-01-31 21:18:57,327 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 1.459016393442623) internal successors, (178), 120 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2022-01-31 21:18:57,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:18:57,329 INFO L225 Difference]: With dead ends: 1779 [2022-01-31 21:18:57,329 INFO L226 Difference]: Without dead ends: 1603 [2022-01-31 21:18:57,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6399 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=911, Invalid=23895, Unknown=0, NotChecked=0, Total=24806 [2022-01-31 21:18:57,330 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 170 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 21632 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 21732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 21632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:18:57,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 358 Invalid, 21732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 21632 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-01-31 21:18:57,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1603 states. [2022-01-31 21:19:00,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1603 to 1390. [2022-01-31 21:19:00,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1390 states, 1382 states have (on average 1.0832127351664256) internal successors, (1497), 1383 states have internal predecessors, (1497), 4 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 21:19:00,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1390 states to 1390 states and 1504 transitions. [2022-01-31 21:19:00,094 INFO L78 Accepts]: Start accepts. Automaton has 1390 states and 1504 transitions. Word has length 182 [2022-01-31 21:19:00,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:00,094 INFO L470 AbstractCegarLoop]: Abstraction has 1390 states and 1504 transitions. [2022-01-31 21:19:00,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 1.459016393442623) internal successors, (178), 120 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:00,094 INFO L276 IsEmpty]: Start isEmpty. Operand 1390 states and 1504 transitions. [2022-01-31 21:19:00,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-01-31 21:19:00,096 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:00,096 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 52, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:00,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2022-01-31 21:19:00,096 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:00,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:00,096 INFO L85 PathProgramCache]: Analyzing trace with hash -35253082, now seen corresponding path program 26 times [2022-01-31 21:19:00,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:00,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141873375] [2022-01-31 21:19:00,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:00,114 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 21:19:00,114 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:19:00,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:00,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:00,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:00,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:00,415 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 21:19:01,230 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:01,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141873375] [2022-01-31 21:19:01,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [141873375] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:01,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:01,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-01-31 21:19:01,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859719547] [2022-01-31 21:19:01,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:01,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-01-31 21:19:01,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:01,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-01-31 21:19:01,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=929, Invalid=2611, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:19:01,232 INFO L87 Difference]: Start difference. First operand 1390 states and 1504 transitions. Second operand has 60 states, 60 states have (on average 2.95) internal successors, (177), 59 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:19:05,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:05,456 INFO L93 Difference]: Finished difference Result 1880 states and 2061 transitions. [2022-01-31 21:19:05,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-01-31 21:19:05,457 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.95) internal successors, (177), 59 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 185 [2022-01-31 21:19:05,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:05,459 INFO L225 Difference]: With dead ends: 1880 [2022-01-31 21:19:05,459 INFO L226 Difference]: Without dead ends: 1696 [2022-01-31 21:19:05,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 37 SyntacticMatches, 35 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3490 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=929, Invalid=2611, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:19:05,460 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 204 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1820 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:05,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 48 Invalid, 1845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1820 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:05,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1696 states. [2022-01-31 21:19:08,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1696 to 1476. [2022-01-31 21:19:08,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1476 states, 1468 states have (on average 1.0797002724795641) internal successors, (1585), 1469 states have internal predecessors, (1585), 4 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 21:19:08,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1476 states to 1476 states and 1592 transitions. [2022-01-31 21:19:08,502 INFO L78 Accepts]: Start accepts. Automaton has 1476 states and 1592 transitions. Word has length 185 [2022-01-31 21:19:08,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:08,502 INFO L470 AbstractCegarLoop]: Abstraction has 1476 states and 1592 transitions. [2022-01-31 21:19:08,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.95) internal successors, (177), 59 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:19:08,502 INFO L276 IsEmpty]: Start isEmpty. Operand 1476 states and 1592 transitions. [2022-01-31 21:19:08,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-01-31 21:19:08,504 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:08,504 INFO L514 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:08,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2022-01-31 21:19:08,504 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:08,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:08,504 INFO L85 PathProgramCache]: Analyzing trace with hash 725654180, now seen corresponding path program 63 times [2022-01-31 21:19:08,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:08,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252362467] [2022-01-31 21:19:08,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:08,550 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,585 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,585 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:08,629 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,663 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:08,664 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:08,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:08,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:08,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:08,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:08,760 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 21:19:14,969 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:14,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252362467] [2022-01-31 21:19:14,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [252362467] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:14,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:14,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2022-01-31 21:19:14,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201401737] [2022-01-31 21:19:14,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:14,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-01-31 21:19:14,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:14,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-01-31 21:19:14,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=15334, Unknown=0, NotChecked=0, Total=16002 [2022-01-31 21:19:14,971 INFO L87 Difference]: Start difference. First operand 1476 states and 1592 transitions. Second operand has 124 states, 124 states have (on average 1.4596774193548387) internal successors, (181), 122 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:27,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:27,627 INFO L93 Difference]: Finished difference Result 1874 states and 2056 transitions. [2022-01-31 21:19:27,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2022-01-31 21:19:27,628 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.4596774193548387) internal successors, (181), 122 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2022-01-31 21:19:27,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:27,630 INFO L225 Difference]: With dead ends: 1874 [2022-01-31 21:19:27,630 INFO L226 Difference]: Without dead ends: 1692 [2022-01-31 21:19:27,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6560 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=923, Invalid=24517, Unknown=0, NotChecked=0, Total=25440 [2022-01-31 21:19:27,631 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 175 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 21752 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 21852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 21752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:27,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 288 Invalid, 21852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 21752 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-01-31 21:19:27,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2022-01-31 21:19:30,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1479. [2022-01-31 21:19:30,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1479 states, 1471 states have (on average 1.079537729435758) internal successors, (1588), 1472 states have internal predecessors, (1588), 4 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 21:19:30,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1479 states to 1479 states and 1595 transitions. [2022-01-31 21:19:30,722 INFO L78 Accepts]: Start accepts. Automaton has 1479 states and 1595 transitions. Word has length 185 [2022-01-31 21:19:30,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:30,723 INFO L470 AbstractCegarLoop]: Abstraction has 1479 states and 1595 transitions. [2022-01-31 21:19:30,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.4596774193548387) internal successors, (181), 122 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,723 INFO L276 IsEmpty]: Start isEmpty. Operand 1479 states and 1595 transitions. [2022-01-31 21:19:30,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-01-31 21:19:30,724 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:30,724 INFO L514 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:30,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2022-01-31 21:19:30,725 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:30,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:30,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1139510424, now seen corresponding path program 64 times [2022-01-31 21:19:30,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:30,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678220081] [2022-01-31 21:19:30,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:30,762 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 21:19:30,800 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,800 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,847 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,881 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 21:19:30,882 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:30,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:30,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:30,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:30,949 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 21:19:36,187 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:36,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678220081] [2022-01-31 21:19:36,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1678220081] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:36,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:36,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [125] imperfect sequences [] total 125 [2022-01-31 21:19:36,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552582746] [2022-01-31 21:19:36,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:36,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-01-31 21:19:36,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:36,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-01-31 21:19:36,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=15199, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:19:36,189 INFO L87 Difference]: Start difference. First operand 1479 states and 1595 transitions. Second operand has 125 states, 125 states have (on average 1.448) internal successors, (181), 123 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:50,440 INFO L93 Difference]: Finished difference Result 1907 states and 2091 transitions. [2022-01-31 21:19:50,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2022-01-31 21:19:50,441 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.448) internal successors, (181), 123 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2022-01-31 21:19:50,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:50,443 INFO L225 Difference]: With dead ends: 1907 [2022-01-31 21:19:50,443 INFO L226 Difference]: Without dead ends: 1725 [2022-01-31 21:19:50,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9428 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1038, Invalid=34118, Unknown=0, NotChecked=0, Total=35156 [2022-01-31 21:19:50,445 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 329 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 22881 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 330 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 23122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 22881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:50,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [330 Valid, 211 Invalid, 23122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 22881 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-01-31 21:19:50,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1725 states. [2022-01-31 21:19:53,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1725 to 1479. [2022-01-31 21:19:53,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1479 states, 1471 states have (on average 1.0802175390890552) internal successors, (1589), 1472 states have internal predecessors, (1589), 4 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 21:19:53,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1479 states to 1479 states and 1596 transitions. [2022-01-31 21:19:53,647 INFO L78 Accepts]: Start accepts. Automaton has 1479 states and 1596 transitions. Word has length 185 [2022-01-31 21:19:53,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:53,647 INFO L470 AbstractCegarLoop]: Abstraction has 1479 states and 1596 transitions. [2022-01-31 21:19:53,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.448) internal successors, (181), 123 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:53,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1479 states and 1596 transitions. [2022-01-31 21:19:53,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-01-31 21:19:53,649 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:53,649 INFO L514 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:53,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2022-01-31 21:19:53,649 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:53,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:53,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1188772487, now seen corresponding path program 65 times [2022-01-31 21:19:53,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:53,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362216355] [2022-01-31 21:19:53,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:53,692 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 21:19:53,732 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:53,733 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:53,768 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 21:19:53,804 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 21:19:53,804 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:53,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:53,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:53,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:53,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:53,888 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 21:19:59,233 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:59,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362216355] [2022-01-31 21:19:59,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [362216355] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:59,234 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:59,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2022-01-31 21:19:59,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037358041] [2022-01-31 21:19:59,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:59,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-01-31 21:19:59,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:59,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-01-31 21:19:59,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=548, Invalid=15454, Unknown=0, NotChecked=0, Total=16002 [2022-01-31 21:19:59,236 INFO L87 Difference]: Start difference. First operand 1479 states and 1596 transitions. Second operand has 126 states, 126 states have (on average 1.4603174603174602) internal successors, (184), 124 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:14,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:14,897 INFO L93 Difference]: Finished difference Result 1912 states and 2098 transitions. [2022-01-31 21:20:14,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2022-01-31 21:20:14,897 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 1.4603174603174602) internal successors, (184), 124 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2022-01-31 21:20:14,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:14,899 INFO L225 Difference]: With dead ends: 1912 [2022-01-31 21:20:14,899 INFO L226 Difference]: Without dead ends: 1730 [2022-01-31 21:20:14,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9112 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=969, Invalid=34187, Unknown=0, NotChecked=0, Total=35156 [2022-01-31 21:20:14,901 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 261 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 26979 mSolverCounterSat, 247 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 27226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 247 IncrementalHoareTripleChecker+Valid, 26979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:14,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 442 Invalid, 27226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [247 Valid, 26979 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2022-01-31 21:20:14,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1730 states. [2022-01-31 21:20:18,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1730 to 1562. [2022-01-31 21:20:18,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1562 states, 1554 states have (on average 1.0772200772200773) internal successors, (1674), 1555 states have internal predecessors, (1674), 4 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 21:20:18,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1562 states to 1562 states and 1681 transitions. [2022-01-31 21:20:18,326 INFO L78 Accepts]: Start accepts. Automaton has 1562 states and 1681 transitions. Word has length 188 [2022-01-31 21:20:18,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:18,326 INFO L470 AbstractCegarLoop]: Abstraction has 1562 states and 1681 transitions. [2022-01-31 21:20:18,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 1.4603174603174602) internal successors, (184), 124 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:18,327 INFO L276 IsEmpty]: Start isEmpty. Operand 1562 states and 1681 transitions. [2022-01-31 21:20:18,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2022-01-31 21:20:18,328 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:18,329 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 54, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:18,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2022-01-31 21:20:18,329 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:18,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:18,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1134519678, now seen corresponding path program 27 times [2022-01-31 21:20:18,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:18,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753128310] [2022-01-31 21:20:18,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:18,345 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 21:20:18,345 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:20:18,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:18,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:18,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:18,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:18,639 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 21:20:19,572 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:19,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753128310] [2022-01-31 21:20:19,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1753128310] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:19,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:19,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-01-31 21:20:19,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958589585] [2022-01-31 21:20:19,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:19,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-01-31 21:20:19,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:19,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-01-31 21:20:19,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=991, Invalid=2791, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:20:19,573 INFO L87 Difference]: Start difference. First operand 1562 states and 1681 transitions. Second operand has 62 states, 62 states have (on average 2.9516129032258065) internal successors, (183), 61 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:20:24,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:24,474 INFO L93 Difference]: Finished difference Result 1992 states and 2180 transitions. [2022-01-31 21:20:24,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-01-31 21:20:24,475 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.9516129032258065) internal successors, (183), 61 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 191 [2022-01-31 21:20:24,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:24,477 INFO L225 Difference]: With dead ends: 1992 [2022-01-31 21:20:24,477 INFO L226 Difference]: Without dead ends: 1802 [2022-01-31 21:20:24,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 35 SyntacticMatches, 39 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3902 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=991, Invalid=2791, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:20:24,477 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 213 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 2141 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 2164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 2141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:24,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 52 Invalid, 2164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 2141 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:20:24,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1802 states. [2022-01-31 21:20:28,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1802 to 1654. [2022-01-31 21:20:28,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1654 states, 1646 states have (on average 1.0741190765492101) internal successors, (1768), 1647 states have internal predecessors, (1768), 4 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 21:20:28,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1654 states to 1654 states and 1775 transitions. [2022-01-31 21:20:28,225 INFO L78 Accepts]: Start accepts. Automaton has 1654 states and 1775 transitions. Word has length 191 [2022-01-31 21:20:28,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:28,226 INFO L470 AbstractCegarLoop]: Abstraction has 1654 states and 1775 transitions. [2022-01-31 21:20:28,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.9516129032258065) internal successors, (183), 61 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:20:28,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1654 states and 1775 transitions. [2022-01-31 21:20:28,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2022-01-31 21:20:28,228 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:28,228 INFO L514 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:28,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2022-01-31 21:20:28,228 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:28,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:28,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1783665724, now seen corresponding path program 66 times [2022-01-31 21:20:28,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:28,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2078770335] [2022-01-31 21:20:28,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:28,277 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,311 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,312 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:28,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:28,390 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:28,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:28,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:28,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:28,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:28,470 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 21:20:34,062 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:34,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2078770335] [2022-01-31 21:20:34,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2078770335] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:34,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:34,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [128] imperfect sequences [] total 128 [2022-01-31 21:20:34,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418911733] [2022-01-31 21:20:34,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:34,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-01-31 21:20:34,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:34,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-01-31 21:20:34,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=15955, Unknown=0, NotChecked=0, Total=16512 [2022-01-31 21:20:34,064 INFO L87 Difference]: Start difference. First operand 1654 states and 1775 transitions. Second operand has 128 states, 128 states have (on average 1.4609375) internal successors, (187), 126 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:48,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:48,884 INFO L93 Difference]: Finished difference Result 1923 states and 2082 transitions. [2022-01-31 21:20:48,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 188 states. [2022-01-31 21:20:48,884 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.4609375) internal successors, (187), 126 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2022-01-31 21:20:48,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:48,887 INFO L225 Difference]: With dead ends: 1923 [2022-01-31 21:20:48,887 INFO L226 Difference]: Without dead ends: 1735 [2022-01-31 21:20:48,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9416 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=985, Invalid=35305, Unknown=0, NotChecked=0, Total=36290 [2022-01-31 21:20:48,889 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 385 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 24441 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 387 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 24691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 24441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:48,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [387 Valid, 64 Invalid, 24691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 24441 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2022-01-31 21:20:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1735 states. [2022-01-31 21:20:52,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1735 to 1657. [2022-01-31 21:20:52,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1657 states, 1649 states have (on average 1.0745906610066707) internal successors, (1772), 1650 states have internal predecessors, (1772), 4 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 21:20:52,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 1779 transitions. [2022-01-31 21:20:52,692 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 1779 transitions. Word has length 191 [2022-01-31 21:20:52,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:52,692 INFO L470 AbstractCegarLoop]: Abstraction has 1657 states and 1779 transitions. [2022-01-31 21:20:52,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.4609375) internal successors, (187), 126 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:52,693 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 1779 transitions. [2022-01-31 21:20:52,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-01-31 21:20:52,695 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:52,695 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:52,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2022-01-31 21:20:52,695 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:52,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:52,695 INFO L85 PathProgramCache]: Analyzing trace with hash -54700697, now seen corresponding path program 67 times [2022-01-31 21:20:52,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:52,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025955695] [2022-01-31 21:20:52,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:52,741 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:52,776 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:52,776 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:52,820 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 21:20:52,855 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 21:20:52,855 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:52,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:52,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:52,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:52,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:52,929 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 21:20:58,603 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:58,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025955695] [2022-01-31 21:20:58,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1025955695] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:58,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:58,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [130] imperfect sequences [] total 130 [2022-01-31 21:20:58,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965858854] [2022-01-31 21:20:58,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:58,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-01-31 21:20:58,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:58,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-01-31 21:20:58,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=16464, Unknown=0, NotChecked=0, Total=17030 [2022-01-31 21:20:58,606 INFO L87 Difference]: Start difference. First operand 1657 states and 1779 transitions. Second operand has 130 states, 130 states have (on average 1.4615384615384615) internal successors, (190), 128 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:13,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:13,757 INFO L93 Difference]: Finished difference Result 1927 states and 2087 transitions. [2022-01-31 21:21:13,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 191 states. [2022-01-31 21:21:13,757 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.4615384615384615) internal successors, (190), 128 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 194 [2022-01-31 21:21:13,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:13,759 INFO L225 Difference]: With dead ends: 1927 [2022-01-31 21:21:13,759 INFO L226 Difference]: Without dead ends: 1739 [2022-01-31 21:21:13,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9725 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=1001, Invalid=36441, Unknown=0, NotChecked=0, Total=37442 [2022-01-31 21:21:13,761 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 361 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 25253 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 25508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 25253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:13,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [363 Valid, 166 Invalid, 25508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 25253 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2022-01-31 21:21:13,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1739 states. [2022-01-31 21:21:17,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1739 to 1660. [2022-01-31 21:21:17,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1652 states have (on average 1.0750605326876512) internal successors, (1776), 1653 states have internal predecessors, (1776), 4 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 21:21:17,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 1783 transitions. [2022-01-31 21:21:17,565 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 1783 transitions. Word has length 194 [2022-01-31 21:21:17,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:17,565 INFO L470 AbstractCegarLoop]: Abstraction has 1660 states and 1783 transitions. [2022-01-31 21:21:17,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 1.4615384615384615) internal successors, (190), 128 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:17,565 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 1783 transitions. [2022-01-31 21:21:17,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-01-31 21:21:17,567 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:17,567 INFO L514 BasicCegarLoop]: trace histogram [58, 58, 56, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:17,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2022-01-31 21:21:17,568 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:17,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:17,568 INFO L85 PathProgramCache]: Analyzing trace with hash 766727526, now seen corresponding path program 28 times [2022-01-31 21:21:17,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:17,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251695800] [2022-01-31 21:21:17,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:17,587 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 21:21:17,588 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:21:17,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:17,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:17,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:17,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:17,913 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 21:21:18,915 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:18,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251695800] [2022-01-31 21:21:18,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1251695800] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:18,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:18,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-01-31 21:21:18,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486580898] [2022-01-31 21:21:18,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:18,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-01-31 21:21:18,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:18,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-01-31 21:21:18,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1055, Invalid=2977, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:21:18,917 INFO L87 Difference]: Start difference. First operand 1660 states and 1783 transitions. Second operand has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:21:24,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:24,236 INFO L93 Difference]: Finished difference Result 2104 states and 2298 transitions. [2022-01-31 21:21:24,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-01-31 21:21:24,236 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 197 [2022-01-31 21:21:24,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:24,238 INFO L225 Difference]: With dead ends: 2104 [2022-01-31 21:21:24,238 INFO L226 Difference]: Without dead ends: 1908 [2022-01-31 21:21:24,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 32 SyntacticMatches, 44 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4393 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1055, Invalid=2977, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:21:24,239 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 221 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 2097 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 2122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2097 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:24,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 48 Invalid, 2122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2097 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:21:24,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1908 states. [2022-01-31 21:21:28,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1908 to 1755. [2022-01-31 21:21:28,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1755 states, 1747 states have (on average 1.072123640526617) internal successors, (1873), 1748 states have internal predecessors, (1873), 4 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 21:21:28,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1755 states to 1755 states and 1880 transitions. [2022-01-31 21:21:28,337 INFO L78 Accepts]: Start accepts. Automaton has 1755 states and 1880 transitions. Word has length 197 [2022-01-31 21:21:28,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:28,337 INFO L470 AbstractCegarLoop]: Abstraction has 1755 states and 1880 transitions. [2022-01-31 21:21:28,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 21:21:28,337 INFO L276 IsEmpty]: Start isEmpty. Operand 1755 states and 1880 transitions. [2022-01-31 21:21:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-01-31 21:21:28,339 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:28,339 INFO L514 BasicCegarLoop]: trace histogram [61, 61, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:28,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2022-01-31 21:21:28,339 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:28,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:28,339 INFO L85 PathProgramCache]: Analyzing trace with hash -2000362268, now seen corresponding path program 68 times [2022-01-31 21:21:28,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:28,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031918674] [2022-01-31 21:21:28,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:28,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,421 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 21:21:28,421 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:28,480 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,521 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,522 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:28,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:28,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:28,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:28,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:28,624 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 21:21:35,580 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:35,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031918674] [2022-01-31 21:21:35,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1031918674] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:35,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:35,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2022-01-31 21:21:35,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112468339] [2022-01-31 21:21:35,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:35,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-01-31 21:21:35,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:35,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-01-31 21:21:35,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=711, Invalid=17379, Unknown=0, NotChecked=0, Total=18090 [2022-01-31 21:21:35,582 INFO L87 Difference]: Start difference. First operand 1755 states and 1880 transitions. Second operand has 132 states, 132 states have (on average 1.4621212121212122) internal successors, (193), 130 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:49,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:49,748 INFO L93 Difference]: Finished difference Result 2096 states and 2291 transitions. [2022-01-31 21:21:49,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2022-01-31 21:21:49,749 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.4621212121212122) internal successors, (193), 130 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 197 [2022-01-31 21:21:49,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:49,750 INFO L225 Difference]: With dead ends: 2096 [2022-01-31 21:21:49,750 INFO L226 Difference]: Without dead ends: 1902 [2022-01-31 21:21:49,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7413 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=982, Invalid=27748, Unknown=0, NotChecked=0, Total=28730 [2022-01-31 21:21:49,752 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 181 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 22133 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 22238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 22133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:49,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 88 Invalid, 22238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 22133 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-01-31 21:21:49,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1902 states. [2022-01-31 21:21:53,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1902 to 1672. [2022-01-31 21:21:53,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1664 states have (on average 1.0757211538461537) internal successors, (1790), 1665 states have internal predecessors, (1790), 4 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 21:21:53,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 1797 transitions. [2022-01-31 21:21:53,649 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 1797 transitions. Word has length 197 [2022-01-31 21:21:53,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:53,649 INFO L470 AbstractCegarLoop]: Abstraction has 1672 states and 1797 transitions. [2022-01-31 21:21:53,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 1.4621212121212122) internal successors, (193), 130 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:53,650 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 1797 transitions. [2022-01-31 21:21:53,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-01-31 21:21:53,651 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:53,651 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:53,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2022-01-31 21:21:53,652 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:53,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:53,652 INFO L85 PathProgramCache]: Analyzing trace with hash -325597113, now seen corresponding path program 69 times [2022-01-31 21:21:53,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:53,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938629908] [2022-01-31 21:21:53,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:53,697 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:53,731 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {0={1=1}, 1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:53,731 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:53,774 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 21:21:53,809 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 21:21:53,810 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:53,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:53,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:53,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:53,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:53,885 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 21:21:59,892 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:59,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938629908] [2022-01-31 21:21:59,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [938629908] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:59,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:59,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [134] imperfect sequences [] total 134 [2022-01-31 21:21:59,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671750454] [2022-01-31 21:21:59,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:59,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-01-31 21:21:59,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:59,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-01-31 21:21:59,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=584, Invalid=17506, Unknown=0, NotChecked=0, Total=18090 [2022-01-31 21:21:59,896 INFO L87 Difference]: Start difference. First operand 1672 states and 1797 transitions. Second operand has 134 states, 134 states have (on average 1.462686567164179) internal successors, (196), 132 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)