/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-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:01:38,971 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:01:38,972 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:01:39,029 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:01:39,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 21:01:39,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 21:01:39,049 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 21:01:39,050 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 21:01:39,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 21:01:39,051 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 21:01:39,052 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 21:01:39,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 21:01:39,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 21:01:39,072 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 21:01:39,073 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 21:01:39,073 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 21:01:39,075 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 21:01:39,093 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:01:39,094 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:01:39,095 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:01:39,098 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 21:01:39,124 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:01:39,125 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:01:39,125 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:01:39,126 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:01:39,127 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:01:39,127 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:01:39,128 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:01:39,128 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:01:39,128 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:01:39,128 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:01:39,128 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:01:39,128 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:01:39,320 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:01:39,347 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:01:39,348 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:01:39,349 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:01:39,351 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:01:39,352 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2022-01-31 21:01:39,397 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf77c353/a542ef02ee024723adc85374e23289fa/FLAG68d6857b4 [2022-01-31 21:01:39,779 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:01:39,780 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2022-01-31 21:01:39,786 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf77c353/a542ef02ee024723adc85374e23289fa/FLAG68d6857b4 [2022-01-31 21:01:39,795 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf77c353/a542ef02ee024723adc85374e23289fa [2022-01-31 21:01:39,797 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:01:39,799 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:01:39,803 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:01:39,803 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:01:39,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:01:39,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:01:39" (1/1) ... [2022-01-31 21:01:39,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39f6dfad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:39, skipping insertion in model container [2022-01-31 21:01:39,809 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:01:39" (1/1) ... [2022-01-31 21:01:39,814 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:01:39,829 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:01:39,976 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-lit/gr2006.i[895,908] [2022-01-31 21:01:39,996 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:01:40,002 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:01:40,011 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-lit/gr2006.i[895,908] [2022-01-31 21:01:40,014 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:01:40,029 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:01:40,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40 WrapperNode [2022-01-31 21:01:40,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:01:40,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:01:40,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:01:40,031 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:01:40,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,039 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,045 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,045 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,054 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,059 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,064 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:01:40,066 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:01:40,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:01:40,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:01:40,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (1/1) ... [2022-01-31 21:01:40,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:01:40,080 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:01:40,091 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 21:01:40,111 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 21:01:40,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:01:40,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:01:40,123 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:01:40,123 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-01-31 21:01:40,124 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:01:40,124 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:01:40,124 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:01:40,124 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:01:40,124 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-31 21:01:40,124 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-31 21:01:40,125 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:01:40,125 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:01:40,125 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-01-31 21:01:40,125 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:01:40,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:01:40,174 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:01:40,175 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:01:40,282 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:01:40,286 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:01:40,286 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-01-31 21:01:40,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:01:40 BoogieIcfgContainer [2022-01-31 21:01:40,288 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:01:40,289 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:01:40,289 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:01:40,291 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:01:40,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:01:39" (1/3) ... [2022-01-31 21:01:40,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76deecd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:01:40, skipping insertion in model container [2022-01-31 21:01:40,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:01:40" (2/3) ... [2022-01-31 21:01:40,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76deecd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:01:40, skipping insertion in model container [2022-01-31 21:01:40,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:01:40" (3/3) ... [2022-01-31 21:01:40,293 INFO L111 eAbstractionObserver]: Analyzing ICFG gr2006.i [2022-01-31 21:01:40,297 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:01:40,297 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:01:40,327 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:01:40,331 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 21:01:40,331 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:01:40,341 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 21:01:40,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:01:40,345 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:40,346 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:40,346 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:40,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:40,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1795296022, now seen corresponding path program 1 times [2022-01-31 21:01:40,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:40,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102845496] [2022-01-31 21:01:40,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:40,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:40,448 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:01:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:40,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:40,554 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:40,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102845496] [2022-01-31 21:01:40,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2102845496] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:40,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:40,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:01:40,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785466650] [2022-01-31 21:01:40,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:40,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:01:40,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:40,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:01:40,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:01:40,583 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 21:01:40,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:40,619 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2022-01-31 21:01:40,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:01:40,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2022-01-31 21:01:40,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:40,625 INFO L225 Difference]: With dead ends: 33 [2022-01-31 21:01:40,626 INFO L226 Difference]: Without dead ends: 14 [2022-01-31 21:01:40,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:01:40,630 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 13 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:40,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 24 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:40,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-01-31 21:01:40,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-01-31 21:01:40,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 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 21:01:40,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-01-31 21:01:40,654 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-01-31 21:01:40,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:40,654 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-01-31 21:01:40,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 21:01:40,655 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-01-31 21:01:40,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 21:01:40,655 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:40,656 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:40,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:01:40,656 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:40,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:40,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1744532035, now seen corresponding path program 1 times [2022-01-31 21:01:40,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:40,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771147788] [2022-01-31 21:01:40,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:40,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:40,663 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:01:40,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:40,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:40,743 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:40,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771147788] [2022-01-31 21:01:40,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [771147788] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:40,743 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:40,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 21:01:40,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283063287] [2022-01-31 21:01:40,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:40,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 21:01:40,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:40,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 21:01:40,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-01-31 21:01:40,745 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 21:01:40,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:40,798 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2022-01-31 21:01:40,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 21:01:40,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2022-01-31 21:01:40,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:40,801 INFO L225 Difference]: With dead ends: 24 [2022-01-31 21:01:40,801 INFO L226 Difference]: Without dead ends: 19 [2022-01-31 21:01:40,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:01:40,805 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:40,805 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 25 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:40,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-01-31 21:01:40,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2022-01-31 21:01:40,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 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 21:01:40,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-01-31 21:01:40,814 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-01-31 21:01:40,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:40,815 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-01-31 21:01:40,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 21:01:40,815 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-01-31 21:01:40,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 21:01:40,816 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:40,816 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:40,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:01:40,819 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:40,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:40,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1801790337, now seen corresponding path program 1 times [2022-01-31 21:01:40,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:40,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41081661] [2022-01-31 21:01:40,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:40,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:40,827 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:01:40,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:40,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:40,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:40,886 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:40,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41081661] [2022-01-31 21:01:40,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [41081661] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:40,886 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:40,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:01:40,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237039193] [2022-01-31 21:01:40,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:40,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:01:40,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:40,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:01:40,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:01:40,887 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 21:01:40,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:40,916 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-01-31 21:01:40,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:01:40,916 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 13 [2022-01-31 21:01:40,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:40,917 INFO L225 Difference]: With dead ends: 28 [2022-01-31 21:01:40,917 INFO L226 Difference]: Without dead ends: 20 [2022-01-31 21:01:40,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-01-31 21:01:40,918 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:40,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 20 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:40,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-01-31 21:01:40,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-01-31 21:01:40,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 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 21:01:40,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-01-31 21:01:40,922 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2022-01-31 21:01:40,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:40,922 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-01-31 21:01:40,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 21:01:40,922 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-01-31 21:01:40,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-01-31 21:01:40,923 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:40,923 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:40,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:01:40,923 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:40,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:40,923 INFO L85 PathProgramCache]: Analyzing trace with hash 799073317, now seen corresponding path program 1 times [2022-01-31 21:01:40,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:40,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418342179] [2022-01-31 21:01:40,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:41,028 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,028 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:01:41,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:41,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:41,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:41,163 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:41,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418342179] [2022-01-31 21:01:41,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1418342179] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:41,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:41,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-01-31 21:01:41,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931999043] [2022-01-31 21:01:41,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:41,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 21:01:41,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:41,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 21:01:41,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:01:41,165 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:01:41,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:41,263 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-01-31 21:01:41,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 21:01:41,263 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-01-31 21:01:41,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:41,264 INFO L225 Difference]: With dead ends: 25 [2022-01-31 21:01:41,264 INFO L226 Difference]: Without dead ends: 20 [2022-01-31 21:01:41,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:01:41,265 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 12 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:41,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 40 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:41,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-01-31 21:01:41,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-01-31 21:01:41,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 3 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 21:01:41,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-01-31 21:01:41,268 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2022-01-31 21:01:41,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:41,269 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-01-31 21:01:41,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:01:41,269 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-01-31 21:01:41,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-31 21:01:41,269 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:41,269 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:41,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:01:41,270 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:41,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:41,270 INFO L85 PathProgramCache]: Analyzing trace with hash 976674245, now seen corresponding path program 2 times [2022-01-31 21:01:41,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:41,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854279383] [2022-01-31 21:01:41,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:41,323 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,375 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,376 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:41,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:41,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:41,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:41,456 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:41,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854279383] [2022-01-31 21:01:41,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [854279383] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:41,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:41,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-01-31 21:01:41,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541741243] [2022-01-31 21:01:41,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:41,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 21:01:41,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:41,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 21:01:41,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:01:41,458 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 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 21:01:41,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:41,523 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2022-01-31 21:01:41,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:01:41,523 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 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 19 [2022-01-31 21:01:41,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:41,524 INFO L225 Difference]: With dead ends: 36 [2022-01-31 21:01:41,524 INFO L226 Difference]: Without dead ends: 27 [2022-01-31 21:01:41,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:01:41,525 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 21 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:41,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 30 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:41,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-31 21:01:41,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2022-01-31 21:01:41,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 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 21:01:41,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-01-31 21:01:41,528 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-01-31 21:01:41,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:41,529 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-01-31 21:01:41,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 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 21:01:41,529 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-01-31 21:01:41,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-01-31 21:01:41,529 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:41,529 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:41,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:01:41,530 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:41,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:41,530 INFO L85 PathProgramCache]: Analyzing trace with hash 965362855, now seen corresponding path program 3 times [2022-01-31 21:01:41,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:41,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625367981] [2022-01-31 21:01:41,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:41,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,625 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,626 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:41,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:41,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:41,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:41,704 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:41,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625367981] [2022-01-31 21:01:41,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [625367981] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:41,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:41,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:01:41,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545628636] [2022-01-31 21:01:41,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:41,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:01:41,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:41,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:01:41,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:01:41,705 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 21:01:41,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:41,775 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-01-31 21:01:41,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 21:01:41,776 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 22 [2022-01-31 21:01:41,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:41,776 INFO L225 Difference]: With dead ends: 39 [2022-01-31 21:01:41,776 INFO L226 Difference]: Without dead ends: 27 [2022-01-31 21:01:41,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:01:41,779 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 17 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:41,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 32 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:01:41,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-31 21:01:41,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-01-31 21:01:41,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 3 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 21:01:41,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-01-31 21:01:41,790 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22 [2022-01-31 21:01:41,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:41,790 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-01-31 21:01:41,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 21:01:41,791 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-01-31 21:01:41,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:01:41,792 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:41,792 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:41,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:01:41,792 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:41,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:41,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1684865917, now seen corresponding path program 4 times [2022-01-31 21:01:41,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:41,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880400551] [2022-01-31 21:01:41,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:41,844 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,888 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:41,888 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:41,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:41,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:41,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:41,925 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 21:01:41,977 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:41,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880400551] [2022-01-31 21:01:41,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1880400551] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:41,977 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:41,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 21:01:41,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56167314] [2022-01-31 21:01:41,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:41,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 21:01:41,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:41,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 21:01:41,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-01-31 21:01:41,978 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 21:01:42,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:42,089 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2022-01-31 21:01:42,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 21:01:42,090 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 25 [2022-01-31 21:01:42,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:42,090 INFO L225 Difference]: With dead ends: 42 [2022-01-31 21:01:42,090 INFO L226 Difference]: Without dead ends: 30 [2022-01-31 21:01:42,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:01:42,091 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 19 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:42,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 43 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:42,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-01-31 21:01:42,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2022-01-31 21:01:42,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 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 21:01:42,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-01-31 21:01:42,096 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-01-31 21:01:42,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:42,097 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-01-31 21:01:42,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 21:01:42,097 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-01-31 21:01:42,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-01-31 21:01:42,097 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:42,098 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:42,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:01:42,098 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:42,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:42,098 INFO L85 PathProgramCache]: Analyzing trace with hash -266410201, now seen corresponding path program 5 times [2022-01-31 21:01:42,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:42,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139074294] [2022-01-31 21:01:42,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:42,162 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:42,227 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:42,228 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:42,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:42,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:42,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:42,336 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:42,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139074294] [2022-01-31 21:01:42,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1139074294] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:42,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:42,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:01:42,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760186842] [2022-01-31 21:01:42,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:42,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:01:42,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:42,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:01:42,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:01:42,338 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 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 21:01:42,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:42,471 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2022-01-31 21:01:42,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-31 21:01:42,471 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 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 28 [2022-01-31 21:01:42,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:42,472 INFO L225 Difference]: With dead ends: 45 [2022-01-31 21:01:42,472 INFO L226 Difference]: Without dead ends: 33 [2022-01-31 21:01:42,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:01:42,473 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 21 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:42,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 49 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:42,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-01-31 21:01:42,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-01-31 21:01:42,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 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 21:01:42,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-01-31 21:01:42,478 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 28 [2022-01-31 21:01:42,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:42,478 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-01-31 21:01:42,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 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 21:01:42,478 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-01-31 21:01:42,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-01-31 21:01:42,479 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:42,479 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:42,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:01:42,479 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:42,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:42,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1235400189, now seen corresponding path program 6 times [2022-01-31 21:01:42,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:42,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561589944] [2022-01-31 21:01:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:42,540 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:42,601 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:42,601 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:42,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:42,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:42,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:42,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:42,639 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 21:01:42,758 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:42,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561589944] [2022-01-31 21:01:42,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1561589944] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:42,758 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:42,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:01:42,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588997753] [2022-01-31 21:01:42,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:42,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:01:42,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:42,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:01:42,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:01:42,759 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 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 21:01:42,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:42,997 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-01-31 21:01:42,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:01:42,997 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 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 31 [2022-01-31 21:01:42,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:42,998 INFO L225 Difference]: With dead ends: 48 [2022-01-31 21:01:42,998 INFO L226 Difference]: Without dead ends: 36 [2022-01-31 21:01:42,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:01:42,999 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:42,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 85 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:42,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-01-31 21:01:43,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-01-31 21:01:43,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 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 21:01:43,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-01-31 21:01:43,004 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-01-31 21:01:43,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:43,004 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-01-31 21:01:43,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 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 21:01:43,004 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-01-31 21:01:43,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-31 21:01:43,005 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:43,005 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:43,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:01:43,005 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:43,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:43,005 INFO L85 PathProgramCache]: Analyzing trace with hash -1940936281, now seen corresponding path program 7 times [2022-01-31 21:01:43,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:43,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628527652] [2022-01-31 21:01:43,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:43,067 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:43,137 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:43,138 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:43,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:43,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:43,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:43,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:43,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:43,323 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:43,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628527652] [2022-01-31 21:01:43,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1628527652] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:43,323 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:43,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:01:43,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906046579] [2022-01-31 21:01:43,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:43,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:01:43,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:43,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:01:43,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:01:43,325 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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 21:01:43,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:43,531 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2022-01-31 21:01:43,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:01:43,531 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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 34 [2022-01-31 21:01:43,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:43,533 INFO L225 Difference]: With dead ends: 51 [2022-01-31 21:01:43,533 INFO L226 Difference]: Without dead ends: 39 [2022-01-31 21:01:43,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:01:43,534 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 25 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:43,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 66 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:43,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-31 21:01:43,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-01-31 21:01:43,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 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 21:01:43,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-01-31 21:01:43,546 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2022-01-31 21:01:43,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:43,546 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-01-31 21:01:43,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 16 states have internal predecessors, (30), 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 21:01:43,547 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-01-31 21:01:43,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:01:43,547 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:43,547 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:43,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:01:43,547 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:43,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:43,548 INFO L85 PathProgramCache]: Analyzing trace with hash -996706429, now seen corresponding path program 8 times [2022-01-31 21:01:43,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:43,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433567672] [2022-01-31 21:01:43,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:43,596 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:43,658 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:43,658 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:43,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:43,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:43,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:43,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:43,896 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:43,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433567672] [2022-01-31 21:01:43,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1433567672] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:43,897 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:43,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:01:43,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753794184] [2022-01-31 21:01:43,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:43,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:01:43,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:43,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:01:43,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:01:43,898 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 20 states, 20 states have (on average 1.65) internal successors, (33), 19 states have internal predecessors, (33), 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 21:01:44,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:44,207 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2022-01-31 21:01:44,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:01:44,208 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 19 states have internal predecessors, (33), 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 37 [2022-01-31 21:01:44,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:44,208 INFO L225 Difference]: With dead ends: 54 [2022-01-31 21:01:44,208 INFO L226 Difference]: Without dead ends: 42 [2022-01-31 21:01:44,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=1179, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:01:44,209 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:44,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 37 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:44,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-01-31 21:01:44,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-01-31 21:01:44,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 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 21:01:44,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-01-31 21:01:44,215 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-01-31 21:01:44,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:44,215 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-01-31 21:01:44,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 19 states have internal predecessors, (33), 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 21:01:44,216 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-01-31 21:01:44,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-31 21:01:44,216 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:44,216 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:44,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:01:44,216 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:44,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:44,217 INFO L85 PathProgramCache]: Analyzing trace with hash 813992999, now seen corresponding path program 9 times [2022-01-31 21:01:44,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:44,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064754975] [2022-01-31 21:01:44,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:44,269 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:44,308 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:44,308 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:44,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:44,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:44,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:44,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:44,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:44,549 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:44,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064754975] [2022-01-31 21:01:44,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1064754975] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:44,550 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:44,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:01:44,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184575964] [2022-01-31 21:01:44,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:44,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:01:44,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:44,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:01:44,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:01:44,551 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 21:01:44,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:44,849 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2022-01-31 21:01:44,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:01:44,850 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 40 [2022-01-31 21:01:44,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:44,850 INFO L225 Difference]: With dead ends: 57 [2022-01-31 21:01:44,850 INFO L226 Difference]: Without dead ends: 45 [2022-01-31 21:01:44,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:01:44,851 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 27 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:44,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 118 Invalid, 633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:01:44,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-31 21:01:44,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2022-01-31 21:01:44,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 3 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 21:01:44,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-01-31 21:01:44,857 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 40 [2022-01-31 21:01:44,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:44,858 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-01-31 21:01:44,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 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 21:01:44,858 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-01-31 21:01:44,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:01:44,858 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:44,858 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:44,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:01:44,859 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:44,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:44,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1428585213, now seen corresponding path program 10 times [2022-01-31 21:01:44,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:44,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213676363] [2022-01-31 21:01:44,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:44,937 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:44,981 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:44,982 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:44,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:44,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:45,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:45,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:45,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:45,205 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:45,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213676363] [2022-01-31 21:01:45,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1213676363] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:45,205 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:45,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:01:45,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498761395] [2022-01-31 21:01:45,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:45,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:01:45,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:45,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:01:45,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:01:45,206 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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 21:01:45,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:45,542 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2022-01-31 21:01:45,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:01:45,542 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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 43 [2022-01-31 21:01:45,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:45,543 INFO L225 Difference]: With dead ends: 60 [2022-01-31 21:01:45,543 INFO L226 Difference]: Without dead ends: 48 [2022-01-31 21:01:45,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=1465, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:01:45,544 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 31 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:45,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 79 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:01:45,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-01-31 21:01:45,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-01-31 21:01:45,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 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 21:01:45,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-01-31 21:01:45,550 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-01-31 21:01:45,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:45,550 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-01-31 21:01:45,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 22 states have internal predecessors, (39), 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 21:01:45,550 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-01-31 21:01:45,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-01-31 21:01:45,551 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:45,551 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:45,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:01:45,551 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:45,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:45,551 INFO L85 PathProgramCache]: Analyzing trace with hash -1859809625, now seen corresponding path program 11 times [2022-01-31 21:01:45,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:45,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473233974] [2022-01-31 21:01:45,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:45,615 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:45,657 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:45,657 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:45,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:45,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:45,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:45,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:45,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:45,899 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:45,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473233974] [2022-01-31 21:01:45,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1473233974] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:45,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:45,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:01:45,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983670007] [2022-01-31 21:01:45,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:45,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:01:45,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:45,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:01:45,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:01:45,900 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 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 21:01:46,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:46,333 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2022-01-31 21:01:46,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:01:46,333 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 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 46 [2022-01-31 21:01:46,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:46,333 INFO L225 Difference]: With dead ends: 63 [2022-01-31 21:01:46,334 INFO L226 Difference]: Without dead ends: 51 [2022-01-31 21:01:46,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=194, Invalid=1786, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:01:46,335 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 33 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:46,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 100 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:01:46,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-01-31 21:01:46,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2022-01-31 21:01:46,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 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 21:01:46,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2022-01-31 21:01:46,341 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 46 [2022-01-31 21:01:46,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:46,341 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2022-01-31 21:01:46,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 24 states have internal predecessors, (42), 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 21:01:46,341 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2022-01-31 21:01:46,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:01:46,342 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:46,342 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:46,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:01:46,342 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:46,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:46,342 INFO L85 PathProgramCache]: Analyzing trace with hash 2075882115, now seen corresponding path program 12 times [2022-01-31 21:01:46,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:46,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948553392] [2022-01-31 21:01:46,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:46,398 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:46,440 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:46,440 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:46,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:46,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:46,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:46,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:46,473 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 21:01:46,723 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:46,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948553392] [2022-01-31 21:01:46,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [948553392] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:46,724 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:46,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:01:46,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348485487] [2022-01-31 21:01:46,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:46,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:01:46,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:46,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:01:46,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=619, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:01:46,725 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 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 21:01:47,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:47,215 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2022-01-31 21:01:47,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:01:47,216 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 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 49 [2022-01-31 21:01:47,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:47,216 INFO L225 Difference]: With dead ends: 66 [2022-01-31 21:01:47,216 INFO L226 Difference]: Without dead ends: 54 [2022-01-31 21:01:47,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=213, Invalid=2139, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:01:47,217 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 35 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 698 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:47,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 41 Invalid, 756 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 698 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:01:47,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-01-31 21:01:47,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2022-01-31 21:01:47,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 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 21:01:47,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-01-31 21:01:47,225 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-01-31 21:01:47,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:47,225 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-01-31 21:01:47,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 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 21:01:47,226 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-01-31 21:01:47,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-31 21:01:47,226 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:47,226 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:47,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:01:47,226 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:47,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:47,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1956294951, now seen corresponding path program 13 times [2022-01-31 21:01:47,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:47,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707247510] [2022-01-31 21:01:47,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:47,293 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:47,359 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:47,359 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:47,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:47,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:47,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:47,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:47,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:47,699 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:47,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707247510] [2022-01-31 21:01:47,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [707247510] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:47,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:47,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:01:47,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276424542] [2022-01-31 21:01:47,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:47,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:01:47,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:47,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:01:47,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=776, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:01:47,701 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 21:01:48,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:48,194 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2022-01-31 21:01:48,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:01:48,195 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 52 [2022-01-31 21:01:48,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:48,195 INFO L225 Difference]: With dead ends: 69 [2022-01-31 21:01:48,195 INFO L226 Difference]: Without dead ends: 57 [2022-01-31 21:01:48,196 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 678 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=237, Invalid=2625, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:01:48,196 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 37 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:48,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 92 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:01:48,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-01-31 21:01:48,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2022-01-31 21:01:48,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 51 states have internal predecessors, (54), 3 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 21:01:48,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2022-01-31 21:01:48,203 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 52 [2022-01-31 21:01:48,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:48,203 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2022-01-31 21:01:48,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 28 states have internal predecessors, (48), 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 21:01:48,203 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2022-01-31 21:01:48,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:01:48,204 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:48,204 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:48,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:01:48,204 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:48,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:48,215 INFO L85 PathProgramCache]: Analyzing trace with hash -137019389, now seen corresponding path program 14 times [2022-01-31 21:01:48,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:48,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080713090] [2022-01-31 21:01:48,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:48,270 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:48,308 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:48,309 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:48,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:48,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:48,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:48,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:48,658 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:48,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080713090] [2022-01-31 21:01:48,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2080713090] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:48,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:48,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:01:48,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784671539] [2022-01-31 21:01:48,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:48,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:01:48,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:48,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:01:48,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=833, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:01:48,660 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 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 21:01:49,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:49,352 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2022-01-31 21:01:49,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:01:49,352 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 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 55 [2022-01-31 21:01:49,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:49,353 INFO L225 Difference]: With dead ends: 72 [2022-01-31 21:01:49,353 INFO L226 Difference]: Without dead ends: 60 [2022-01-31 21:01:49,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=251, Invalid=2941, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:01:49,354 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 39 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1056 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:49,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 128 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1056 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:01:49,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-01-31 21:01:49,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2022-01-31 21:01:49,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 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 21:01:49,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-01-31 21:01:49,365 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-01-31 21:01:49,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:49,365 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-01-31 21:01:49,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 30 states have internal predecessors, (51), 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 21:01:49,365 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-01-31 21:01:49,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-01-31 21:01:49,366 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:49,366 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:49,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:01:49,367 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:49,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:49,367 INFO L85 PathProgramCache]: Analyzing trace with hash 860615591, now seen corresponding path program 15 times [2022-01-31 21:01:49,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:49,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603268615] [2022-01-31 21:01:49,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:49,420 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:49,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:49,460 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:49,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:49,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:49,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:49,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:49,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:49,846 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:49,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603268615] [2022-01-31 21:01:49,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1603268615] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:49,846 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:49,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:01:49,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021129459] [2022-01-31 21:01:49,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:49,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:01:49,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:49,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:01:49,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1014, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:01:49,848 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 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 21:01:50,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:50,375 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-01-31 21:01:50,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:01:50,376 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 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 58 [2022-01-31 21:01:50,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:50,376 INFO L225 Difference]: With dead ends: 75 [2022-01-31 21:01:50,376 INFO L226 Difference]: Without dead ends: 63 [2022-01-31 21:01:50,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=275, Invalid=3507, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:01:50,378 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 41 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 986 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 986 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:50,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 59 Invalid, 1057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 986 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:01:50,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-31 21:01:50,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-01-31 21:01:50,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 3 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 21:01:50,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2022-01-31 21:01:50,385 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 58 [2022-01-31 21:01:50,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:50,385 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2022-01-31 21:01:50,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 32 states have internal predecessors, (54), 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 21:01:50,385 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2022-01-31 21:01:50,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:01:50,385 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:50,385 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:50,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:01:50,386 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:50,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:50,386 INFO L85 PathProgramCache]: Analyzing trace with hash 230616451, now seen corresponding path program 16 times [2022-01-31 21:01:50,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:50,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430903772] [2022-01-31 21:01:50,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:50,481 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:50,556 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:50,556 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:50,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:50,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:50,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:50,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:50,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:51,011 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:51,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430903772] [2022-01-31 21:01:51,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [430903772] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:51,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:51,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:01:51,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579782843] [2022-01-31 21:01:51,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:51,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:01:51,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:51,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:01:51,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1079, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:01:51,012 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 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 21:01:51,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:51,553 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2022-01-31 21:01:51,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:01:51,553 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 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 61 [2022-01-31 21:01:51,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:51,554 INFO L225 Difference]: With dead ends: 78 [2022-01-31 21:01:51,554 INFO L226 Difference]: Without dead ends: 66 [2022-01-31 21:01:51,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=289, Invalid=3871, Unknown=0, NotChecked=0, Total=4160 [2022-01-31 21:01:51,556 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 43 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 1206 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 1277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 1206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:51,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 105 Invalid, 1277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 1206 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:01:51,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-01-31 21:01:51,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-01-31 21:01:51,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 3 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 21:01:51,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-01-31 21:01:51,562 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-01-31 21:01:51,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:51,563 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-01-31 21:01:51,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 34 states have internal predecessors, (57), 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 21:01:51,563 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-01-31 21:01:51,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-01-31 21:01:51,563 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:51,563 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:51,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:01:51,563 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:51,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:51,564 INFO L85 PathProgramCache]: Analyzing trace with hash 933320231, now seen corresponding path program 17 times [2022-01-31 21:01:51,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:51,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646327939] [2022-01-31 21:01:51,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:51,613 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:51,675 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:51,676 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:51,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:51,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:51,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:51,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:51,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:52,144 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:52,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646327939] [2022-01-31 21:01:52,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [646327939] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:52,144 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:52,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:01:52,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064149460] [2022-01-31 21:01:52,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:52,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:01:52,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:52,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:01:52,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1214, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:01:52,146 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 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 21:01:52,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:52,924 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2022-01-31 21:01:52,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:01:52,924 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 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 64 [2022-01-31 21:01:52,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:52,925 INFO L225 Difference]: With dead ends: 81 [2022-01-31 21:01:52,925 INFO L226 Difference]: Without dead ends: 69 [2022-01-31 21:01:52,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=308, Invalid=4384, Unknown=0, NotChecked=0, Total=4692 [2022-01-31 21:01:52,926 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 45 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1280 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 1349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 1280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:52,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 141 Invalid, 1349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 1280 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:01:52,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-01-31 21:01:52,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2022-01-31 21:01:52,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 63 states have internal predecessors, (66), 3 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 21:01:52,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2022-01-31 21:01:52,934 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 64 [2022-01-31 21:01:52,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:52,934 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2022-01-31 21:01:52,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 36 states have internal predecessors, (60), 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 21:01:52,934 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2022-01-31 21:01:52,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:01:52,937 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:52,939 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:52,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:01:52,939 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:52,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:52,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1511029507, now seen corresponding path program 18 times [2022-01-31 21:01:52,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:52,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980177168] [2022-01-31 21:01:52,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:53,004 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:53,039 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:53,039 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:53,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:53,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:53,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:53,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:53,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:53,570 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:53,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980177168] [2022-01-31 21:01:53,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [980177168] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:53,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:53,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:01:53,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048478407] [2022-01-31 21:01:53,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:53,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:01:53,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:53,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:01:53,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1357, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:01:53,572 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 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 21:01:54,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:54,395 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2022-01-31 21:01:54,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:01:54,395 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 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 67 [2022-01-31 21:01:54,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:54,396 INFO L225 Difference]: With dead ends: 84 [2022-01-31 21:01:54,396 INFO L226 Difference]: Without dead ends: 72 [2022-01-31 21:01:54,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=327, Invalid=4929, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:01:54,398 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 47 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 1491 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:54,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 97 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 1491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:01:54,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-01-31 21:01:54,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-01-31 21:01:54,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 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 21:01:54,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-01-31 21:01:54,406 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-01-31 21:01:54,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:54,406 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-01-31 21:01:54,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.6153846153846154) internal successors, (63), 38 states have internal predecessors, (63), 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 21:01:54,407 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-01-31 21:01:54,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-01-31 21:01:54,410 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:54,410 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:54,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:01:54,410 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:54,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:54,411 INFO L85 PathProgramCache]: Analyzing trace with hash 2114115751, now seen corresponding path program 19 times [2022-01-31 21:01:54,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:54,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008154538] [2022-01-31 21:01:54,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:54,456 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:54,503 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:54,504 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:54,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:54,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:54,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:54,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:54,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:55,094 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:55,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008154538] [2022-01-31 21:01:55,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2008154538] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:55,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:55,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:01:55,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589712464] [2022-01-31 21:01:55,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:55,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:01:55,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:55,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:01:55,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1508, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:01:55,096 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 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 21:01:55,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:55,850 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2022-01-31 21:01:55,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:01:55,850 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 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 70 [2022-01-31 21:01:55,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:55,851 INFO L225 Difference]: With dead ends: 87 [2022-01-31 21:01:55,851 INFO L226 Difference]: Without dead ends: 75 [2022-01-31 21:01:55,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1517 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=346, Invalid=5506, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:01:55,854 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 49 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1732 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 1808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 1732 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:55,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 173 Invalid, 1808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 1732 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:01:55,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-01-31 21:01:55,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2022-01-31 21:01:55,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 3 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 21:01:55,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2022-01-31 21:01:55,869 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 70 [2022-01-31 21:01:55,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:55,869 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2022-01-31 21:01:55,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6097560975609757) internal successors, (66), 40 states have internal predecessors, (66), 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 21:01:55,869 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2022-01-31 21:01:55,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:01:55,869 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:55,870 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:55,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:01:55,870 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:55,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:55,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1486755709, now seen corresponding path program 20 times [2022-01-31 21:01:55,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:55,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908438661] [2022-01-31 21:01:55,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:55,925 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:55,994 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:55,994 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:55,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:55,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:56,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:56,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:56,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:56,608 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:56,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908438661] [2022-01-31 21:01:56,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1908438661] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:56,608 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:56,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:01:56,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918228802] [2022-01-31 21:01:56,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:56,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:01:56,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:56,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:01:56,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1667, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:01:56,610 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 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 21:01:57,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:57,720 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2022-01-31 21:01:57,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:01:57,720 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 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 73 [2022-01-31 21:01:57,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:57,721 INFO L225 Difference]: With dead ends: 90 [2022-01-31 21:01:57,721 INFO L226 Difference]: Without dead ends: 78 [2022-01-31 21:01:57,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=365, Invalid=6115, Unknown=0, NotChecked=0, Total=6480 [2022-01-31 21:01:57,723 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 51 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 2058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:57,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 164 Invalid, 2058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 1974 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:01:57,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-01-31 21:01:57,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2022-01-31 21:01:57,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 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 21:01:57,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-01-31 21:01:57,736 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-01-31 21:01:57,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:57,737 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-01-31 21:01:57,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 42 states have internal predecessors, (69), 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 21:01:57,740 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-01-31 21:01:57,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-31 21:01:57,741 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:57,741 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:57,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:01:57,741 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:57,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:57,741 INFO L85 PathProgramCache]: Analyzing trace with hash 349731623, now seen corresponding path program 21 times [2022-01-31 21:01:57,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:57,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774113330] [2022-01-31 21:01:57,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:57,798 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:57,868 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:57,868 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:57,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:57,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:57,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:57,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:57,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:58,547 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:58,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774113330] [2022-01-31 21:01:58,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [774113330] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:58,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:58,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:01:58,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154936824] [2022-01-31 21:01:58,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:58,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:01:58,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:58,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:01:58,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1834, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:01:58,549 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 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 21:01:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:59,621 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2022-01-31 21:01:59,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:01:59,622 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 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 76 [2022-01-31 21:01:59,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:59,622 INFO L225 Difference]: With dead ends: 93 [2022-01-31 21:01:59,622 INFO L226 Difference]: Without dead ends: 81 [2022-01-31 21:01:59,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1885 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=384, Invalid=6756, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:01:59,624 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 53 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1720 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1720 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:59,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 45 Invalid, 1824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 1720 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:01:59,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-31 21:01:59,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2022-01-31 21:01:59,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.04) internal successors, (78), 75 states have internal predecessors, (78), 3 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 21:01:59,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2022-01-31 21:01:59,634 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 76 [2022-01-31 21:01:59,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:59,634 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2022-01-31 21:01:59,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.6) internal successors, (72), 44 states have internal predecessors, (72), 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 21:01:59,634 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2022-01-31 21:01:59,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:01:59,634 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:59,634 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:59,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:01:59,635 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:59,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:59,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1850422787, now seen corresponding path program 22 times [2022-01-31 21:01:59,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:59,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946310123] [2022-01-31 21:01:59,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:59,696 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:59,765 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:59,765 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:59,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:59,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:59,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:59,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:59,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:00,487 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:00,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946310123] [2022-01-31 21:02:00,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1946310123] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:00,487 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:00,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:02:00,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987855029] [2022-01-31 21:02:00,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:00,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:02:00,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:00,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:02:00,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2009, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:02:00,489 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 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 21:02:01,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:01,707 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-01-31 21:02:01,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:02:01,708 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 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 79 [2022-01-31 21:02:01,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:01,708 INFO L225 Difference]: With dead ends: 96 [2022-01-31 21:02:01,708 INFO L226 Difference]: Without dead ends: 84 [2022-01-31 21:02:01,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2084 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=403, Invalid=7429, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:02:01,710 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 55 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 2183 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 2292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 2183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:01,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 46 Invalid, 2292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 2183 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:02:01,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-01-31 21:02:01,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2022-01-31 21:02:01,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 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 21:02:01,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-01-31 21:02:01,720 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-01-31 21:02:01,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:01,720 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-01-31 21:02:01,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 46 states have internal predecessors, (75), 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 21:02:01,720 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-01-31 21:02:01,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-31 21:02:01,721 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:01,721 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:01,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:02:01,721 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:01,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:01,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1668661849, now seen corresponding path program 23 times [2022-01-31 21:02:01,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:01,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775491957] [2022-01-31 21:02:01,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:01,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:01,810 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:01,811 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:01,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:01,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:01,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:01,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:01,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:02,603 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:02,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775491957] [2022-01-31 21:02:02,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [775491957] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:02,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:02,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:02:02,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461928016] [2022-01-31 21:02:02,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:02,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:02:02,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:02,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:02:02,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2192, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:02:02,605 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 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 21:02:03,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:03,940 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2022-01-31 21:02:03,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:02:03,940 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 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 82 [2022-01-31 21:02:03,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:03,941 INFO L225 Difference]: With dead ends: 99 [2022-01-31 21:02:03,941 INFO L226 Difference]: Without dead ends: 87 [2022-01-31 21:02:03,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2293 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=422, Invalid=8134, Unknown=0, NotChecked=0, Total=8556 [2022-01-31 21:02:03,942 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 57 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 2478 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 2581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 2478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:03,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 137 Invalid, 2581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 2478 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:02:03,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-01-31 21:02:03,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2022-01-31 21:02:03,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 3 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 21:02:03,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2022-01-31 21:02:03,954 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 82 [2022-01-31 21:02:03,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:03,954 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2022-01-31 21:02:03,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 48 states have internal predecessors, (78), 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 21:02:03,954 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2022-01-31 21:02:03,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:02:03,954 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:03,955 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:03,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:02:03,955 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:03,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:03,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1432642435, now seen corresponding path program 24 times [2022-01-31 21:02:03,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:03,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583607996] [2022-01-31 21:02:03,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:04,019 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:04,074 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:04,074 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:04,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:04,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:04,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:04,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:04,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:04,797 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:04,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583607996] [2022-01-31 21:02:04,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [583607996] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:04,798 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:04,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:02:04,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020208548] [2022-01-31 21:02:04,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:04,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:02:04,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:04,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:02:04,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:02:04,799 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 52 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 51 states have internal predecessors, (81), 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 21:02:06,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:06,249 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2022-01-31 21:02:06,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-01-31 21:02:06,249 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 51 states have internal predecessors, (81), 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 85 [2022-01-31 21:02:06,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:06,249 INFO L225 Difference]: With dead ends: 102 [2022-01-31 21:02:06,249 INFO L226 Difference]: Without dead ends: 90 [2022-01-31 21:02:06,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1316 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=441, Invalid=9659, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:02:06,251 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 57 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 3508 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 3606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 3508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:06,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 98 Invalid, 3606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 3508 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:02:06,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-01-31 21:02:06,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2022-01-31 21:02:06,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 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 21:02:06,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-01-31 21:02:06,263 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-01-31 21:02:06,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:06,263 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-01-31 21:02:06,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 51 states have internal predecessors, (81), 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 21:02:06,268 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-01-31 21:02:06,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-01-31 21:02:06,268 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:06,268 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:06,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:02:06,269 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:06,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:06,269 INFO L85 PathProgramCache]: Analyzing trace with hash -947904473, now seen corresponding path program 25 times [2022-01-31 21:02:06,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:06,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916940664] [2022-01-31 21:02:06,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:06,327 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:06,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:06,378 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:06,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:06,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:06,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:06,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:06,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:07,247 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:07,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916940664] [2022-01-31 21:02:07,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [916940664] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:07,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:07,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-01-31 21:02:07,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79015309] [2022-01-31 21:02:07,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:07,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-01-31 21:02:07,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:07,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-01-31 21:02:07,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2582, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:02:07,249 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 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 21:02:08,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:08,914 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2022-01-31 21:02:08,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-01-31 21:02:08,914 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 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 88 [2022-01-31 21:02:08,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:08,915 INFO L225 Difference]: With dead ends: 105 [2022-01-31 21:02:08,915 INFO L226 Difference]: Without dead ends: 93 [2022-01-31 21:02:08,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2741 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=460, Invalid=9640, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:02:08,917 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 61 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 3178 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 3291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 3178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:08,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 179 Invalid, 3291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 3178 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:02:08,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-01-31 21:02:08,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2022-01-31 21:02:08,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 3 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 21:02:08,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2022-01-31 21:02:08,930 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 88 [2022-01-31 21:02:08,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:08,930 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2022-01-31 21:02:08,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.5849056603773586) internal successors, (84), 52 states have internal predecessors, (84), 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 21:02:08,930 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2022-01-31 21:02:08,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-01-31 21:02:08,930 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:08,931 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:08,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:02:08,931 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:08,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:08,931 INFO L85 PathProgramCache]: Analyzing trace with hash -1320849149, now seen corresponding path program 26 times [2022-01-31 21:02:08,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:08,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749566901] [2022-01-31 21:02:08,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:08,984 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:09,034 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:09,034 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:09,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:09,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:09,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:09,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:09,072 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 21:02:09,975 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:09,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749566901] [2022-01-31 21:02:09,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1749566901] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:09,975 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:09,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:02:09,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271719404] [2022-01-31 21:02:09,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:09,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:02:09,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:09,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:02:09,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2789, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:02:09,976 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 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 21:02:11,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:11,351 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2022-01-31 21:02:11,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:02:11,352 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 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 91 [2022-01-31 21:02:11,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:11,352 INFO L225 Difference]: With dead ends: 108 [2022-01-31 21:02:11,352 INFO L226 Difference]: Without dead ends: 96 [2022-01-31 21:02:11,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2980 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=479, Invalid=10441, Unknown=0, NotChecked=0, Total=10920 [2022-01-31 21:02:11,353 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 63 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 3000 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 3120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 3000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:11,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 125 Invalid, 3120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 3000 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:02:11,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-01-31 21:02:11,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2022-01-31 21:02:11,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 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 21:02:11,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-01-31 21:02:11,366 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-01-31 21:02:11,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:11,366 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-01-31 21:02:11,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.5818181818181818) internal successors, (87), 54 states have internal predecessors, (87), 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 21:02:11,366 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-01-31 21:02:11,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-01-31 21:02:11,366 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:11,366 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:11,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:02:11,367 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:11,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:11,367 INFO L85 PathProgramCache]: Analyzing trace with hash -635297113, now seen corresponding path program 27 times [2022-01-31 21:02:11,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:11,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927983524] [2022-01-31 21:02:11,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:11,411 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:11,454 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:11,455 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:11,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:11,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:11,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:11,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:12,451 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:12,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927983524] [2022-01-31 21:02:12,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [927983524] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:12,451 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:12,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-01-31 21:02:12,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984584116] [2022-01-31 21:02:12,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:12,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-01-31 21:02:12,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:12,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-01-31 21:02:12,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3004, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:02:12,453 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 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 21:02:14,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:14,159 INFO L93 Difference]: Finished difference Result 111 states and 116 transitions. [2022-01-31 21:02:14,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-01-31 21:02:14,160 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 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 94 [2022-01-31 21:02:14,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:14,160 INFO L225 Difference]: With dead ends: 111 [2022-01-31 21:02:14,161 INFO L226 Difference]: Without dead ends: 99 [2022-01-31 21:02:14,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3229 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=498, Invalid=11274, Unknown=0, NotChecked=0, Total=11772 [2022-01-31 21:02:14,162 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 65 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 3101 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 3226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 3101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:14,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 116 Invalid, 3226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 3101 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:02:14,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-01-31 21:02:14,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2022-01-31 21:02:14,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.032258064516129) internal successors, (96), 93 states have internal predecessors, (96), 3 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 21:02:14,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2022-01-31 21:02:14,176 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 94 [2022-01-31 21:02:14,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:14,176 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2022-01-31 21:02:14,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 56 states have internal predecessors, (90), 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 21:02:14,177 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2022-01-31 21:02:14,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-01-31 21:02:14,177 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:14,177 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:14,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:02:14,177 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:14,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:14,178 INFO L85 PathProgramCache]: Analyzing trace with hash 75914883, now seen corresponding path program 28 times [2022-01-31 21:02:14,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:14,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474940723] [2022-01-31 21:02:14,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:14,242 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:14,294 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:14,294 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:14,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:14,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:14,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:14,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:15,156 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:15,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474940723] [2022-01-31 21:02:15,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [474940723] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:15,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:15,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-01-31 21:02:15,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250338612] [2022-01-31 21:02:15,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:15,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-01-31 21:02:15,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:15,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-01-31 21:02:15,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=3341, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:02:15,158 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 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 21:02:17,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:17,082 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2022-01-31 21:02:17,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-01-31 21:02:17,083 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 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 97 [2022-01-31 21:02:17,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:17,084 INFO L225 Difference]: With dead ends: 114 [2022-01-31 21:02:17,084 INFO L226 Difference]: Without dead ends: 102 [2022-01-31 21:02:17,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3543 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=522, Invalid=12360, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:02:17,086 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 67 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 3666 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 3784 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 3666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:17,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 207 Invalid, 3784 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 3666 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:02:17,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-01-31 21:02:17,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2022-01-31 21:02:17,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 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 21:02:17,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-01-31 21:02:17,107 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-01-31 21:02:17,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:17,108 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-01-31 21:02:17,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.576271186440678) internal successors, (93), 58 states have internal predecessors, (93), 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 21:02:17,108 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-01-31 21:02:17,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-01-31 21:02:17,108 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:17,108 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:17,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:02:17,109 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:17,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:17,109 INFO L85 PathProgramCache]: Analyzing trace with hash 718816551, now seen corresponding path program 29 times [2022-01-31 21:02:17,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:17,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958442376] [2022-01-31 21:02:17,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:17,151 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:17,207 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:17,210 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:17,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:17,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:17,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:17,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:17,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:18,661 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:18,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958442376] [2022-01-31 21:02:18,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [958442376] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:18,662 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:18,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-01-31 21:02:18,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7800825] [2022-01-31 21:02:18,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:18,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-01-31 21:02:18,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:18,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-01-31 21:02:18,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=3723, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:02:18,663 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 62 states, 62 states have (on average 1.5483870967741935) internal successors, (96), 61 states have internal predecessors, (96), 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 21:02:20,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:20,636 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2022-01-31 21:02:20,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-01-31 21:02:20,637 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.5483870967741935) internal successors, (96), 61 states have internal predecessors, (96), 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 100 [2022-01-31 21:02:20,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:20,637 INFO L225 Difference]: With dead ends: 117 [2022-01-31 21:02:20,637 INFO L226 Difference]: Without dead ends: 105 [2022-01-31 21:02:20,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1881 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=531, Invalid=13989, Unknown=0, NotChecked=0, Total=14520 [2022-01-31 21:02:20,639 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 67 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 5261 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 5379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 5261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:20,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 243 Invalid, 5379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 5261 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:02:20,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-01-31 21:02:20,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2022-01-31 21:02:20,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 99 states have internal predecessors, (102), 3 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 21:02:20,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2022-01-31 21:02:20,655 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 100 [2022-01-31 21:02:20,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:20,655 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2022-01-31 21:02:20,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.5483870967741935) internal successors, (96), 61 states have internal predecessors, (96), 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 21:02:20,655 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2022-01-31 21:02:20,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-01-31 21:02:20,656 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:20,656 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:20,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:02:20,656 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:20,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:20,656 INFO L85 PathProgramCache]: Analyzing trace with hash 2143235075, now seen corresponding path program 30 times [2022-01-31 21:02:20,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:20,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541559048] [2022-01-31 21:02:20,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:20,709 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:20,750 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:20,750 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:20,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:20,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:20,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:20,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:20,790 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 21:02:21,691 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:21,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541559048] [2022-01-31 21:02:21,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [541559048] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:21,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:21,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-01-31 21:02:21,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095391927] [2022-01-31 21:02:21,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:21,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-01-31 21:02:21,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:21,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-01-31 21:02:21,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3697, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:02:21,694 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 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 21:02:23,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:23,160 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2022-01-31 21:02:23,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-01-31 21:02:23,161 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 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 103 [2022-01-31 21:02:23,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:23,161 INFO L225 Difference]: With dead ends: 120 [2022-01-31 21:02:23,161 INFO L226 Difference]: Without dead ends: 108 [2022-01-31 21:02:23,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4036 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=555, Invalid=13965, Unknown=0, NotChecked=0, Total=14520 [2022-01-31 21:02:23,167 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 71 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 4909 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 5031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 4909 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:23,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 294 Invalid, 5031 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 4909 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:02:23,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-01-31 21:02:23,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2022-01-31 21:02:23,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 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 21:02:23,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-01-31 21:02:23,181 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-01-31 21:02:23,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:23,181 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-01-31 21:02:23,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.5714285714285714) internal successors, (99), 62 states have internal predecessors, (99), 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 21:02:23,182 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-01-31 21:02:23,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-01-31 21:02:23,182 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:23,182 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:23,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:02:23,182 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:23,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:23,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1576368217, now seen corresponding path program 31 times [2022-01-31 21:02:23,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:23,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826535510] [2022-01-31 21:02:23,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:23,255 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:23,298 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:23,299 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:23,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:23,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:23,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:23,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:23,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:24,330 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:24,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826535510] [2022-01-31 21:02:24,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [826535510] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:24,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:24,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-01-31 21:02:24,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23164561] [2022-01-31 21:02:24,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:24,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-01-31 21:02:24,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:24,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-01-31 21:02:24,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=4070, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 21:02:24,331 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 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 21:02:26,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:26,404 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2022-01-31 21:02:26,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-01-31 21:02:26,405 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 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 106 [2022-01-31 21:02:26,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:26,405 INFO L225 Difference]: With dead ends: 123 [2022-01-31 21:02:26,405 INFO L226 Difference]: Without dead ends: 111 [2022-01-31 21:02:26,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4386 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=579, Invalid=15171, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:02:26,408 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 73 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 4144 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 4276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 4144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:26,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 215 Invalid, 4276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 4144 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:02:26,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-01-31 21:02:26,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2022-01-31 21:02:26,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 105 states have (on average 1.0285714285714285) internal successors, (108), 105 states have internal predecessors, (108), 3 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 21:02:26,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2022-01-31 21:02:26,423 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 106 [2022-01-31 21:02:26,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:26,423 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2022-01-31 21:02:26,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 64 states have internal predecessors, (102), 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 21:02:26,423 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2022-01-31 21:02:26,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-01-31 21:02:26,423 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:26,423 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:26,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:02:26,424 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:26,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:26,424 INFO L85 PathProgramCache]: Analyzing trace with hash -2121803389, now seen corresponding path program 32 times [2022-01-31 21:02:26,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:26,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575198686] [2022-01-31 21:02:26,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:26,462 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:26,502 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:26,503 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:26,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:26,556 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:26,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:26,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:27,825 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:27,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575198686] [2022-01-31 21:02:27,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1575198686] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:27,826 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:27,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-01-31 21:02:27,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231146155] [2022-01-31 21:02:27,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:27,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-01-31 21:02:27,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:27,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-01-31 21:02:27,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=4360, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:02:27,827 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 68 states, 68 states have (on average 1.5441176470588236) internal successors, (105), 67 states have internal predecessors, (105), 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 21:02:30,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:30,182 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2022-01-31 21:02:30,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-01-31 21:02:30,187 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.5441176470588236) internal successors, (105), 67 states have internal predecessors, (105), 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 109 [2022-01-31 21:02:30,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:30,188 INFO L225 Difference]: With dead ends: 126 [2022-01-31 21:02:30,188 INFO L226 Difference]: Without dead ends: 114 [2022-01-31 21:02:30,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2080 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=578, Invalid=16714, Unknown=0, NotChecked=0, Total=17292 [2022-01-31 21:02:30,189 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 73 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 6212 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 6342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 6212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:30,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 126 Invalid, 6342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 6212 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:02:30,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-01-31 21:02:30,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2022-01-31 21:02:30,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 3 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 21:02:30,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2022-01-31 21:02:30,205 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2022-01-31 21:02:30,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:30,205 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2022-01-31 21:02:30,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.5441176470588236) internal successors, (105), 67 states have internal predecessors, (105), 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 21:02:30,205 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2022-01-31 21:02:30,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-01-31 21:02:30,206 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:30,206 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:30,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:02:30,206 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:30,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:30,206 INFO L85 PathProgramCache]: Analyzing trace with hash 975235623, now seen corresponding path program 33 times [2022-01-31 21:02:30,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:30,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256319172] [2022-01-31 21:02:30,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:30,257 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:30,292 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:30,293 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:30,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:30,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:30,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:30,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:30,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:31,750 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:31,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256319172] [2022-01-31 21:02:31,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [256319172] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:31,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:31,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-01-31 21:02:31,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812429999] [2022-01-31 21:02:31,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:31,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-01-31 21:02:31,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:31,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-01-31 21:02:31,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=4563, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:02:31,753 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 70 states, 70 states have (on average 1.542857142857143) internal successors, (108), 69 states have internal predecessors, (108), 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 21:02:34,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:34,712 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2022-01-31 21:02:34,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-01-31 21:02:34,713 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.542857142857143) internal successors, (108), 69 states have internal predecessors, (108), 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 112 [2022-01-31 21:02:34,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:34,713 INFO L225 Difference]: With dead ends: 128 [2022-01-31 21:02:34,713 INFO L226 Difference]: Without dead ends: 116 [2022-01-31 21:02:34,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2405 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=797, Invalid=17835, Unknown=0, NotChecked=0, Total=18632 [2022-01-31 21:02:34,715 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 107 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 6520 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 6726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 6520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:34,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 141 Invalid, 6726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 6520 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:02:34,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-01-31 21:02:34,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2022-01-31 21:02:34,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 states have internal predecessors, (114), 3 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 21:02:34,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2022-01-31 21:02:34,732 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 112 [2022-01-31 21:02:34,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:34,732 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2022-01-31 21:02:34,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.542857142857143) internal successors, (108), 69 states have internal predecessors, (108), 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 21:02:34,732 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2022-01-31 21:02:34,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-01-31 21:02:34,733 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:34,733 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:34,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:02:34,733 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:34,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:34,733 INFO L85 PathProgramCache]: Analyzing trace with hash 376989443, now seen corresponding path program 34 times [2022-01-31 21:02:34,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:34,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612667855] [2022-01-31 21:02:34,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:34,776 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:34,810 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:34,810 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:34,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:34,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:34,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:34,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:34,854 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 21:02:36,124 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:36,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612667855] [2022-01-31 21:02:36,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [612667855] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:36,125 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:36,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2022-01-31 21:02:36,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074289430] [2022-01-31 21:02:36,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:36,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-01-31 21:02:36,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:36,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-01-31 21:02:36,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=4871, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:02:36,126 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 71 states, 71 states have (on average 1.5633802816901408) internal successors, (111), 70 states have internal predecessors, (111), 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 21:02:38,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:38,941 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2022-01-31 21:02:38,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-01-31 21:02:38,941 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.5633802816901408) internal successors, (111), 70 states have internal predecessors, (111), 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 115 [2022-01-31 21:02:38,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:38,942 INFO L225 Difference]: With dead ends: 132 [2022-01-31 21:02:38,942 INFO L226 Difference]: Without dead ends: 120 [2022-01-31 21:02:38,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5319 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=636, Invalid=18270, Unknown=0, NotChecked=0, Total=18906 [2022-01-31 21:02:38,944 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 79 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 5030 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 5187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 5030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:38,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 148 Invalid, 5187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 5030 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-01-31 21:02:38,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-01-31 21:02:38,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2022-01-31 21:02:38,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 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 21:02:38,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2022-01-31 21:02:38,960 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2022-01-31 21:02:38,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:38,960 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2022-01-31 21:02:38,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.5633802816901408) internal successors, (111), 70 states have internal predecessors, (111), 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 21:02:38,961 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2022-01-31 21:02:38,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-01-31 21:02:38,961 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:38,961 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:38,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:02:38,961 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:38,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:38,962 INFO L85 PathProgramCache]: Analyzing trace with hash 2139319463, now seen corresponding path program 35 times [2022-01-31 21:02:38,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:38,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971685967] [2022-01-31 21:02:38,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:39,009 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:39,080 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:39,080 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:39,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:39,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:39,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:39,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:39,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:40,538 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:40,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971685967] [2022-01-31 21:02:40,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1971685967] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:40,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:40,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-01-31 21:02:40,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167589393] [2022-01-31 21:02:40,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:40,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-01-31 21:02:40,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:40,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-01-31 21:02:40,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=5012, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:02:40,540 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 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 21:02:42,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:42,838 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2022-01-31 21:02:42,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-01-31 21:02:42,839 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 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 118 [2022-01-31 21:02:42,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:42,839 INFO L225 Difference]: With dead ends: 135 [2022-01-31 21:02:42,839 INFO L226 Difference]: Without dead ends: 123 [2022-01-31 21:02:42,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5581 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=650, Invalid=19090, Unknown=0, NotChecked=0, Total=19740 [2022-01-31 21:02:42,841 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 81 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 5701 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 5842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 5701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:42,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 304 Invalid, 5842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 5701 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:02:42,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-01-31 21:02:42,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2022-01-31 21:02:42,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 3 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 21:02:42,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2022-01-31 21:02:42,870 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2022-01-31 21:02:42,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:42,870 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2022-01-31 21:02:42,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.5616438356164384) internal successors, (114), 72 states have internal predecessors, (114), 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 21:02:42,870 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2022-01-31 21:02:42,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-01-31 21:02:42,870 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:42,870 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:42,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:02:42,871 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:42,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:42,871 INFO L85 PathProgramCache]: Analyzing trace with hash 2032718979, now seen corresponding path program 36 times [2022-01-31 21:02:42,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:42,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155660601] [2022-01-31 21:02:42,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:42,918 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:42,943 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:42,943 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:42,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:42,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:42,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:42,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:42,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:43,979 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:43,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155660601] [2022-01-31 21:02:43,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [155660601] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:43,979 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:43,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-01-31 21:02:43,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993720742] [2022-01-31 21:02:43,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:43,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-01-31 21:02:43,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:43,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-01-31 21:02:43,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=5299, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:02:43,981 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 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 21:02:46,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:46,038 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2022-01-31 21:02:46,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-01-31 21:02:46,038 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 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 121 [2022-01-31 21:02:46,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:46,039 INFO L225 Difference]: With dead ends: 138 [2022-01-31 21:02:46,039 INFO L226 Difference]: Without dead ends: 126 [2022-01-31 21:02:46,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5920 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=669, Invalid=20211, Unknown=0, NotChecked=0, Total=20880 [2022-01-31 21:02:46,040 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 83 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 5725 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 5897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 5725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:46,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 135 Invalid, 5897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 5725 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:02:46,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-01-31 21:02:46,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2022-01-31 21:02:46,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 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 21:02:46,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2022-01-31 21:02:46,065 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2022-01-31 21:02:46,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:46,065 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2022-01-31 21:02:46,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.56) internal successors, (117), 74 states have internal predecessors, (117), 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 21:02:46,066 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2022-01-31 21:02:46,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-01-31 21:02:46,066 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:46,066 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:46,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:02:46,066 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:46,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:46,067 INFO L85 PathProgramCache]: Analyzing trace with hash 278531879, now seen corresponding path program 37 times [2022-01-31 21:02:46,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:46,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454768623] [2022-01-31 21:02:46,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:46,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:46,143 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:46,143 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:46,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:46,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:46,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:46,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:46,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:47,227 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:47,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454768623] [2022-01-31 21:02:47,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1454768623] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:47,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:47,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2022-01-31 21:02:47,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144504786] [2022-01-31 21:02:47,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:47,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-01-31 21:02:47,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:47,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-01-31 21:02:47,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=5594, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:02:47,229 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 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 21:02:49,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:49,170 INFO L93 Difference]: Finished difference Result 141 states and 146 transitions. [2022-01-31 21:02:49,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-01-31 21:02:49,171 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 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 124 [2022-01-31 21:02:49,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:49,196 INFO L225 Difference]: With dead ends: 141 [2022-01-31 21:02:49,196 INFO L226 Difference]: Without dead ends: 129 [2022-01-31 21:02:49,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6269 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=688, Invalid=21364, Unknown=0, NotChecked=0, Total=22052 [2022-01-31 21:02:49,197 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 85 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 6290 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 6448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 6290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:49,197 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 271 Invalid, 6448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 6290 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:02:49,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-01-31 21:02:49,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2022-01-31 21:02:49,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.024390243902439) internal successors, (126), 123 states have internal predecessors, (126), 3 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 21:02:49,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2022-01-31 21:02:49,232 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 124 [2022-01-31 21:02:49,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:49,232 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2022-01-31 21:02:49,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.5584415584415585) internal successors, (120), 76 states have internal predecessors, (120), 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 21:02:49,233 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2022-01-31 21:02:49,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-01-31 21:02:49,233 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:49,233 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:49,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:02:49,233 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:49,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:49,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1842273789, now seen corresponding path program 38 times [2022-01-31 21:02:49,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:49,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707368640] [2022-01-31 21:02:49,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:49,279 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:49,319 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:49,319 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:49,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:49,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:49,354 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:49,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:49,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:51,070 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:51,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707368640] [2022-01-31 21:02:51,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [707368640] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:51,071 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:51,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2022-01-31 21:02:51,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952035916] [2022-01-31 21:02:51,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:51,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-01-31 21:02:51,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:51,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-01-31 21:02:51,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=5897, Unknown=0, NotChecked=0, Total=6162 [2022-01-31 21:02:51,072 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 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 21:02:54,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:54,175 INFO L93 Difference]: Finished difference Result 144 states and 149 transitions. [2022-01-31 21:02:54,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-01-31 21:02:54,175 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 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 127 [2022-01-31 21:02:54,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:54,176 INFO L225 Difference]: With dead ends: 144 [2022-01-31 21:02:54,176 INFO L226 Difference]: Without dead ends: 132 [2022-01-31 21:02:54,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6628 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=707, Invalid=22549, Unknown=0, NotChecked=0, Total=23256 [2022-01-31 21:02:54,177 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 87 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 6463 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 6625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 6463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:54,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 277 Invalid, 6625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 6463 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:02:54,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-01-31 21:02:54,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2022-01-31 21:02:54,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 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 21:02:54,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2022-01-31 21:02:54,196 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 127 [2022-01-31 21:02:54,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:54,197 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2022-01-31 21:02:54,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.5569620253164558) internal successors, (123), 78 states have internal predecessors, (123), 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 21:02:54,197 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2022-01-31 21:02:54,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-01-31 21:02:54,197 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:54,197 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:54,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:02:54,197 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:54,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:54,198 INFO L85 PathProgramCache]: Analyzing trace with hash 499962279, now seen corresponding path program 39 times [2022-01-31 21:02:54,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:54,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206476809] [2022-01-31 21:02:54,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:54,253 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:54,292 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:54,292 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:54,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:54,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:54,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:54,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:54,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:02:55,728 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:02:55,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206476809] [2022-01-31 21:02:55,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1206476809] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:02:55,728 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:02:55,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2022-01-31 21:02:55,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510192428] [2022-01-31 21:02:55,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:02:55,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-01-31 21:02:55,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:02:55,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-01-31 21:02:55,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=6208, Unknown=0, NotChecked=0, Total=6480 [2022-01-31 21:02:55,730 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 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 21:02:58,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:02:58,439 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2022-01-31 21:02:58,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-01-31 21:02:58,440 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 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 130 [2022-01-31 21:02:58,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:02:58,442 INFO L225 Difference]: With dead ends: 147 [2022-01-31 21:02:58,442 INFO L226 Difference]: Without dead ends: 135 [2022-01-31 21:02:58,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6997 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=726, Invalid=23766, Unknown=0, NotChecked=0, Total=24492 [2022-01-31 21:02:58,446 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 89 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 7797 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 7967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 7797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:02:58,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 298 Invalid, 7967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 7797 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:02:58,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-01-31 21:02:58,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2022-01-31 21:02:58,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 3 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 21:02:58,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2022-01-31 21:02:58,466 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 130 [2022-01-31 21:02:58,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:02:58,466 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2022-01-31 21:02:58,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.5555555555555556) internal successors, (126), 80 states have internal predecessors, (126), 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 21:02:58,466 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2022-01-31 21:02:58,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-01-31 21:02:58,467 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:02:58,467 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:02:58,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:02:58,467 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:02:58,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:02:58,467 INFO L85 PathProgramCache]: Analyzing trace with hash 2015973251, now seen corresponding path program 40 times [2022-01-31 21:02:58,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:02:58,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908781793] [2022-01-31 21:02:58,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:02:58,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:58,566 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:02:58,566 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:02:58,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:02:58,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:58,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:02:58,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:02:58,596 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:00,402 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:00,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908781793] [2022-01-31 21:03:00,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1908781793] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:00,402 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:00,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-01-31 21:03:00,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868989165] [2022-01-31 21:03:00,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:00,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-01-31 21:03:00,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:00,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-01-31 21:03:00,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=6891, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:03:00,403 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 84 states, 84 states have (on average 1.5357142857142858) internal successors, (129), 83 states have internal predecessors, (129), 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 21:03:04,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:04,893 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2022-01-31 21:03:04,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-01-31 21:03:04,894 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.5357142857142858) internal successors, (129), 83 states have internal predecessors, (129), 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 133 [2022-01-31 21:03:04,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:04,895 INFO L225 Difference]: With dead ends: 150 [2022-01-31 21:03:04,895 INFO L226 Difference]: Without dead ends: 138 [2022-01-31 21:03:04,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3476 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=729, Invalid=26331, Unknown=0, NotChecked=0, Total=27060 [2022-01-31 21:03:04,897 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 89 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 9690 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 9852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 9690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:04,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 159 Invalid, 9852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 9690 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-01-31 21:03:04,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-01-31 21:03:04,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2022-01-31 21:03:04,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 3 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 21:03:04,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2022-01-31 21:03:04,927 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 133 [2022-01-31 21:03:04,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:04,927 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2022-01-31 21:03:04,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.5357142857142858) internal successors, (129), 83 states have internal predecessors, (129), 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 21:03:04,928 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2022-01-31 21:03:04,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-01-31 21:03:04,928 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:04,928 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:04,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:03:04,928 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:04,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:04,928 INFO L85 PathProgramCache]: Analyzing trace with hash -377244633, now seen corresponding path program 41 times [2022-01-31 21:03:04,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:04,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102686874] [2022-01-31 21:03:04,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:04,982 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:05,032 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:05,032 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:05,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:05,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:05,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:05,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:06,635 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102686874] [2022-01-31 21:03:06,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [102686874] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:06,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:06,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2022-01-31 21:03:06,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353485313] [2022-01-31 21:03:06,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:06,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-01-31 21:03:06,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:06,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-01-31 21:03:06,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=6854, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:03:06,636 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 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 21:03:08,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:08,955 INFO L93 Difference]: Finished difference Result 153 states and 158 transitions. [2022-01-31 21:03:08,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-01-31 21:03:08,956 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 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 136 [2022-01-31 21:03:08,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:08,956 INFO L225 Difference]: With dead ends: 153 [2022-01-31 21:03:08,956 INFO L226 Difference]: Without dead ends: 141 [2022-01-31 21:03:08,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7765 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=764, Invalid=26296, Unknown=0, NotChecked=0, Total=27060 [2022-01-31 21:03:08,958 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 93 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 7316 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 7514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 7316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:08,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 105 Invalid, 7514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 7316 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:03:08,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-01-31 21:03:08,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2022-01-31 21:03:08,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 135 states have internal predecessors, (138), 3 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 21:03:08,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2022-01-31 21:03:08,981 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 136 [2022-01-31 21:03:08,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:08,981 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2022-01-31 21:03:08,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.5529411764705883) internal successors, (132), 84 states have internal predecessors, (132), 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 21:03:08,982 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2022-01-31 21:03:08,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-01-31 21:03:08,982 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:08,983 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:08,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:03:08,983 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:08,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:08,984 INFO L85 PathProgramCache]: Analyzing trace with hash -274113277, now seen corresponding path program 42 times [2022-01-31 21:03:08,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:08,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730202296] [2022-01-31 21:03:08,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:09,038 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:09,069 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:09,070 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:09,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:09,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:09,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:09,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:09,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:11,133 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:11,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730202296] [2022-01-31 21:03:11,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1730202296] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:11,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:11,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2022-01-31 21:03:11,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275348846] [2022-01-31 21:03:11,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:11,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-01-31 21:03:11,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:11,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-01-31 21:03:11,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=7189, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:03:11,134 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand has 87 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 86 states have internal predecessors, (135), 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 21:03:14,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:14,604 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2022-01-31 21:03:14,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-01-31 21:03:14,605 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 86 states have internal predecessors, (135), 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 139 [2022-01-31 21:03:14,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:14,605 INFO L225 Difference]: With dead ends: 156 [2022-01-31 21:03:14,605 INFO L226 Difference]: Without dead ends: 144 [2022-01-31 21:03:14,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8164 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=783, Invalid=27609, Unknown=0, NotChecked=0, Total=28392 [2022-01-31 21:03:14,607 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 95 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 8030 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 8209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 8030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:14,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 311 Invalid, 8209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 8030 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-01-31 21:03:14,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-01-31 21:03:14,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2022-01-31 21:03:14,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 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 21:03:14,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2022-01-31 21:03:14,630 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2022-01-31 21:03:14,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:14,631 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2022-01-31 21:03:14,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 86 states have internal predecessors, (135), 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 21:03:14,631 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2022-01-31 21:03:14,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-01-31 21:03:14,631 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:14,631 INFO L514 BasicCegarLoop]: trace histogram [44, 43, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:14,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:03:14,632 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:14,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:14,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1210496679, now seen corresponding path program 43 times [2022-01-31 21:03:14,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:14,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930504389] [2022-01-31 21:03:14,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:14,684 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:14,737 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:14,737 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:14,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:14,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:14,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:14,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:14,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:16,206 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:16,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930504389] [2022-01-31 21:03:16,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [930504389] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:16,209 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:16,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2022-01-31 21:03:16,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40785700] [2022-01-31 21:03:16,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:16,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-01-31 21:03:16,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:16,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-01-31 21:03:16,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=7532, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:03:16,210 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 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 21:03:18,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:18,987 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2022-01-31 21:03:18,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-01-31 21:03:18,987 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 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 142 [2022-01-31 21:03:18,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:18,988 INFO L225 Difference]: With dead ends: 159 [2022-01-31 21:03:18,988 INFO L226 Difference]: Without dead ends: 147 [2022-01-31 21:03:18,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8573 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=802, Invalid=28954, Unknown=0, NotChecked=0, Total=29756 [2022-01-31 21:03:18,991 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 97 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 7734 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 7910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 7734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:18,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 327 Invalid, 7910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 7734 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-01-31 21:03:18,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-01-31 21:03:19,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2022-01-31 21:03:19,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.0212765957446808) internal successors, (144), 141 states have internal predecessors, (144), 3 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 21:03:19,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2022-01-31 21:03:19,014 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 142 [2022-01-31 21:03:19,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:19,014 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2022-01-31 21:03:19,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 88 states have internal predecessors, (138), 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 21:03:19,014 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2022-01-31 21:03:19,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-01-31 21:03:19,015 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:19,015 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:19,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:03:19,015 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:19,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:19,015 INFO L85 PathProgramCache]: Analyzing trace with hash -347518333, now seen corresponding path program 44 times [2022-01-31 21:03:19,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:19,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451029441] [2022-01-31 21:03:19,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:19,068 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:19,101 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:19,101 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:19,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:19,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:19,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:19,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:19,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:20,751 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:20,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451029441] [2022-01-31 21:03:20,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1451029441] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:20,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:20,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2022-01-31 21:03:20,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512069440] [2022-01-31 21:03:20,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:20,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-01-31 21:03:20,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:20,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-01-31 21:03:20,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=7883, Unknown=0, NotChecked=0, Total=8190 [2022-01-31 21:03:20,753 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 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 21:03:23,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:23,761 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2022-01-31 21:03:23,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-01-31 21:03:23,761 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 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 145 [2022-01-31 21:03:23,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:23,762 INFO L225 Difference]: With dead ends: 162 [2022-01-31 21:03:23,762 INFO L226 Difference]: Without dead ends: 150 [2022-01-31 21:03:23,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8992 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=821, Invalid=30331, Unknown=0, NotChecked=0, Total=31152 [2022-01-31 21:03:23,764 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 99 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 9185 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 9376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 9185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:23,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 318 Invalid, 9376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 9185 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:03:23,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-01-31 21:03:23,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2022-01-31 21:03:23,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 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 21:03:23,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2022-01-31 21:03:23,810 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2022-01-31 21:03:23,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:23,810 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2022-01-31 21:03:23,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 90 states have internal predecessors, (141), 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 21:03:23,810 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2022-01-31 21:03:23,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2022-01-31 21:03:23,811 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:23,811 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:23,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:03:23,811 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:23,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:23,811 INFO L85 PathProgramCache]: Analyzing trace with hash 538827047, now seen corresponding path program 45 times [2022-01-31 21:03:23,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:23,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843995860] [2022-01-31 21:03:23,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:23,837 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:23,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:23,876 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:23,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:23,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:23,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:23,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:23,913 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 21:03:25,522 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:25,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843995860] [2022-01-31 21:03:25,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1843995860] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:25,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:25,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2022-01-31 21:03:25,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369985891] [2022-01-31 21:03:25,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:25,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-01-31 21:03:25,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:25,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-01-31 21:03:25,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=8242, Unknown=0, NotChecked=0, Total=8556 [2022-01-31 21:03:25,537 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 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 21:03:29,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:29,194 INFO L93 Difference]: Finished difference Result 165 states and 170 transitions. [2022-01-31 21:03:29,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-01-31 21:03:29,194 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 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 148 [2022-01-31 21:03:29,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:29,195 INFO L225 Difference]: With dead ends: 165 [2022-01-31 21:03:29,195 INFO L226 Difference]: Without dead ends: 153 [2022-01-31 21:03:29,196 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9421 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=840, Invalid=31740, Unknown=0, NotChecked=0, Total=32580 [2022-01-31 21:03:29,196 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 101 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 9265 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 9457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 9265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:29,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 324 Invalid, 9457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 9265 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-01-31 21:03:29,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-01-31 21:03:29,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2022-01-31 21:03:29,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 3 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 21:03:29,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2022-01-31 21:03:29,221 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 148 [2022-01-31 21:03:29,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:29,221 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2022-01-31 21:03:29,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.5483870967741935) internal successors, (144), 92 states have internal predecessors, (144), 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 21:03:29,221 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2022-01-31 21:03:29,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-01-31 21:03:29,222 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:29,222 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:29,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:03:29,222 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:29,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:29,222 INFO L85 PathProgramCache]: Analyzing trace with hash 195106819, now seen corresponding path program 46 times [2022-01-31 21:03:29,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:29,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386966530] [2022-01-31 21:03:29,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:29,272 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:29,311 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:29,312 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:29,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:29,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:29,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:29,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:29,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:31,328 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:31,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386966530] [2022-01-31 21:03:31,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [386966530] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:31,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:31,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2022-01-31 21:03:31,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441049432] [2022-01-31 21:03:31,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:31,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-01-31 21:03:31,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:31,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-01-31 21:03:31,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=9027, Unknown=0, NotChecked=0, Total=9312 [2022-01-31 21:03:31,330 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 96 states, 96 states have (on average 1.53125) internal successors, (147), 95 states have internal predecessors, (147), 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 21:03:35,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:35,401 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2022-01-31 21:03:35,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-01-31 21:03:35,401 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.53125) internal successors, (147), 95 states have internal predecessors, (147), 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 151 [2022-01-31 21:03:35,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:35,402 INFO L225 Difference]: With dead ends: 168 [2022-01-31 21:03:35,402 INFO L226 Difference]: Without dead ends: 156 [2022-01-31 21:03:35,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4550 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=837, Invalid=34695, Unknown=0, NotChecked=0, Total=35532 [2022-01-31 21:03:35,403 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 101 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 12990 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 13176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 12990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:35,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 340 Invalid, 13176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 12990 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-01-31 21:03:35,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-01-31 21:03:35,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2022-01-31 21:03:35,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 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 21:03:35,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2022-01-31 21:03:35,429 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 151 [2022-01-31 21:03:35,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:35,430 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2022-01-31 21:03:35,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.53125) internal successors, (147), 95 states have internal predecessors, (147), 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 21:03:35,430 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2022-01-31 21:03:35,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-01-31 21:03:35,430 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:35,430 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:35,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:03:35,432 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:35,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:35,432 INFO L85 PathProgramCache]: Analyzing trace with hash -372171865, now seen corresponding path program 47 times [2022-01-31 21:03:35,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:35,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074166081] [2022-01-31 21:03:35,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:35,465 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:35,489 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:35,490 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:35,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:35,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:35,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:35,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:35,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:37,475 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:37,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074166081] [2022-01-31 21:03:37,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2074166081] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:37,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:37,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2022-01-31 21:03:37,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198751661] [2022-01-31 21:03:37,475 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:37,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-01-31 21:03:37,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:37,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-01-31 21:03:37,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=8984, Unknown=0, NotChecked=0, Total=9312 [2022-01-31 21:03:37,477 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 97 states, 97 states have (on average 1.5463917525773196) internal successors, (150), 96 states have internal predecessors, (150), 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 21:03:40,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:40,432 INFO L93 Difference]: Finished difference Result 171 states and 176 transitions. [2022-01-31 21:03:40,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-01-31 21:03:40,432 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.5463917525773196) internal successors, (150), 96 states have internal predecessors, (150), 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 154 [2022-01-31 21:03:40,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:40,433 INFO L225 Difference]: With dead ends: 171 [2022-01-31 21:03:40,433 INFO L226 Difference]: Without dead ends: 159 [2022-01-31 21:03:40,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10309 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=878, Invalid=34654, Unknown=0, NotChecked=0, Total=35532 [2022-01-31 21:03:40,434 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 105 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 9669 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 9870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 9669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:40,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 326 Invalid, 9870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 9669 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:03:40,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-01-31 21:03:40,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2022-01-31 21:03:40,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 3 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 21:03:40,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 160 transitions. [2022-01-31 21:03:40,461 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 160 transitions. Word has length 154 [2022-01-31 21:03:40,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:40,461 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 160 transitions. [2022-01-31 21:03:40,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.5463917525773196) internal successors, (150), 96 states have internal predecessors, (150), 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 21:03:40,461 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 160 transitions. [2022-01-31 21:03:40,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-01-31 21:03:40,462 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:40,462 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:40,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:03:40,462 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:40,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:40,462 INFO L85 PathProgramCache]: Analyzing trace with hash 524862851, now seen corresponding path program 48 times [2022-01-31 21:03:40,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:40,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487433497] [2022-01-31 21:03:40,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:40,505 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:40,566 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:40,566 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:40,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:40,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:40,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:40,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:40,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:42,427 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:42,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487433497] [2022-01-31 21:03:42,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1487433497] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:42,428 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:42,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2022-01-31 21:03:42,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24635360] [2022-01-31 21:03:42,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:42,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-01-31 21:03:42,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:42,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-01-31 21:03:42,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=9367, Unknown=0, NotChecked=0, Total=9702 [2022-01-31 21:03:42,429 INFO L87 Difference]: Start difference. First operand 158 states and 160 transitions. Second operand has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 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 21:03:45,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:45,589 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2022-01-31 21:03:45,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-01-31 21:03:45,589 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 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 157 [2022-01-31 21:03:45,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:45,590 INFO L225 Difference]: With dead ends: 174 [2022-01-31 21:03:45,590 INFO L226 Difference]: Without dead ends: 162 [2022-01-31 21:03:45,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10768 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=897, Invalid=36159, Unknown=0, NotChecked=0, Total=37056 [2022-01-31 21:03:45,594 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 107 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 10930 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 11159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 10930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:45,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 177 Invalid, 11159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 10930 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:03:45,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-01-31 21:03:45,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2022-01-31 21:03:45,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 3 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 21:03:45,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2022-01-31 21:03:45,621 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 157 [2022-01-31 21:03:45,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:45,621 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2022-01-31 21:03:45,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.5454545454545454) internal successors, (153), 98 states have internal predecessors, (153), 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 21:03:45,622 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2022-01-31 21:03:45,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2022-01-31 21:03:45,622 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:45,622 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:45,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:03:45,622 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:45,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:45,623 INFO L85 PathProgramCache]: Analyzing trace with hash 799571495, now seen corresponding path program 49 times [2022-01-31 21:03:45,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:45,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277692791] [2022-01-31 21:03:45,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:45,651 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:45,684 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:45,684 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:45,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:45,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:45,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:45,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:45,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:48,799 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:48,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277692791] [2022-01-31 21:03:48,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1277692791] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:48,799 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:48,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2022-01-31 21:03:48,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657471485] [2022-01-31 21:03:48,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:48,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-01-31 21:03:48,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:48,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-01-31 21:03:48,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=10203, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:03:48,801 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 102 states, 102 states have (on average 1.5294117647058822) internal successors, (156), 101 states have internal predecessors, (156), 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 21:03:54,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:03:54,973 INFO L93 Difference]: Finished difference Result 179 states and 185 transitions. [2022-01-31 21:03:54,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-01-31 21:03:54,973 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.5294117647058822) internal successors, (156), 101 states have internal predecessors, (156), 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 160 [2022-01-31 21:03:54,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:03:54,974 INFO L225 Difference]: With dead ends: 179 [2022-01-31 21:03:54,974 INFO L226 Difference]: Without dead ends: 167 [2022-01-31 21:03:54,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5335 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=800, Invalid=39802, Unknown=0, NotChecked=0, Total=40602 [2022-01-31 21:03:54,976 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 109 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 14960 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 15164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 14960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:03:54,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 378 Invalid, 15164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 14960 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:03:54,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-01-31 21:03:55,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 164. [2022-01-31 21:03:55,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0188679245283019) internal successors, (162), 159 states have internal predecessors, (162), 3 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 21:03:55,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2022-01-31 21:03:55,004 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2022-01-31 21:03:55,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:03:55,004 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2022-01-31 21:03:55,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.5294117647058822) internal successors, (156), 101 states have internal predecessors, (156), 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 21:03:55,005 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2022-01-31 21:03:55,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2022-01-31 21:03:55,005 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:03:55,005 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:03:55,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:03:55,006 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:03:55,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:03:55,006 INFO L85 PathProgramCache]: Analyzing trace with hash -1562881277, now seen corresponding path program 50 times [2022-01-31 21:03:55,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:03:55,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393081842] [2022-01-31 21:03:55,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:03:55,038 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:55,071 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:03:55,071 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:03:55,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:03:55,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:55,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:03:55,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:03:55,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:03:56,951 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:03:56,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393081842] [2022-01-31 21:03:56,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [393081842] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:03:56,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:03:56,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2022-01-31 21:03:56,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463463519] [2022-01-31 21:03:56,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:03:56,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-01-31 21:03:56,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:03:56,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-01-31 21:03:56,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=10155, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:03:56,953 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand has 103 states, 103 states have (on average 1.5436893203883495) internal successors, (159), 102 states have internal predecessors, (159), 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 21:04:00,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:04:00,271 INFO L93 Difference]: Finished difference Result 183 states and 189 transitions. [2022-01-31 21:04:00,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-01-31 21:04:00,272 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.5436893203883495) internal successors, (159), 102 states have internal predecessors, (159), 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 163 [2022-01-31 21:04:00,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:04:00,272 INFO L225 Difference]: With dead ends: 183 [2022-01-31 21:04:00,272 INFO L226 Difference]: Without dead ends: 171 [2022-01-31 21:04:00,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12154 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=953, Invalid=40053, Unknown=0, NotChecked=0, Total=41006 [2022-01-31 21:04:00,274 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 114 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 11048 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 11285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 11048 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:04:00,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 253 Invalid, 11285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 11048 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:04:00,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-01-31 21:04:00,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 167. [2022-01-31 21:04:00,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0185185185185186) internal successors, (165), 162 states have internal predecessors, (165), 3 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 21:04:00,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2022-01-31 21:04:00,322 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 163 [2022-01-31 21:04:00,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:04:00,322 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2022-01-31 21:04:00,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.5436893203883495) internal successors, (159), 102 states have internal predecessors, (159), 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 21:04:00,322 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2022-01-31 21:04:00,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-01-31 21:04:00,323 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:04:00,323 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:04:00,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:04:00,323 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:04:00,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:04:00,323 INFO L85 PathProgramCache]: Analyzing trace with hash 235667623, now seen corresponding path program 51 times [2022-01-31 21:04:00,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:04:00,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664711245] [2022-01-31 21:04:00,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:04:00,356 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:04:00,403 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:04:00,403 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:04:00,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:04:00,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:04:00,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:04:00,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:04:00,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:04:03,476 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:04:03,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664711245] [2022-01-31 21:04:03,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [664711245] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:04:03,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:04:03,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2022-01-31 21:04:03,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101432372] [2022-01-31 21:04:03,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:04:03,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-01-31 21:04:03,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:04:03,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-01-31 21:04:03,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=10975, Unknown=0, NotChecked=0, Total=11342 [2022-01-31 21:04:03,479 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 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 21:04:08,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:04:08,245 INFO L93 Difference]: Finished difference Result 191 states and 200 transitions. [2022-01-31 21:04:08,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-01-31 21:04:08,246 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 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 166 [2022-01-31 21:04:08,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:04:08,246 INFO L225 Difference]: With dead ends: 191 [2022-01-31 21:04:08,246 INFO L226 Difference]: Without dead ends: 179 [2022-01-31 21:04:08,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13697 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1010, Invalid=43722, Unknown=0, NotChecked=0, Total=44732 [2022-01-31 21:04:08,249 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 119 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 12246 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 12485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 12246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:04:08,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 340 Invalid, 12485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 12246 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-01-31 21:04:08,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-01-31 21:04:08,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 173. [2022-01-31 21:04:08,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 3 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 21:04:08,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2022-01-31 21:04:08,302 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2022-01-31 21:04:08,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:04:08,302 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2022-01-31 21:04:08,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.514018691588785) internal successors, (162), 106 states have internal predecessors, (162), 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 21:04:08,302 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2022-01-31 21:04:08,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-01-31 21:04:08,303 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:04:08,303 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 50, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:04:08,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-01-31 21:04:08,303 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:04:08,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:04:08,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1347095361, now seen corresponding path program 52 times [2022-01-31 21:04:08,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:04:08,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140012996] [2022-01-31 21:04:08,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:04:08,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:04:08,388 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:04:08,388 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:04:08,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:04:08,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:04:08,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:04:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:04:08,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:04:11,754 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:04:11,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140012996] [2022-01-31 21:04:11,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2140012996] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:04:11,754 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:04:11,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2022-01-31 21:04:11,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839199421] [2022-01-31 21:04:11,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:04:11,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-01-31 21:04:11,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:04:11,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-01-31 21:04:11,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=11666, Unknown=0, NotChecked=0, Total=11990 [2022-01-31 21:04:11,755 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 110 states, 110 states have (on average 1.5) internal successors, (165), 109 states have internal predecessors, (165), 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 21:04:16,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:04:16,539 INFO L93 Difference]: Finished difference Result 175 states and 177 transitions. [2022-01-31 21:04:16,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-01-31 21:04:16,539 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.5) internal successors, (165), 109 states have internal predecessors, (165), 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 169 [2022-01-31 21:04:16,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:04:16,539 INFO L225 Difference]: With dead ends: 175 [2022-01-31 21:04:16,540 INFO L226 Difference]: Without dead ends: 0 [2022-01-31 21:04:16,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6956 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=851, Invalid=45159, Unknown=0, NotChecked=0, Total=46010 [2022-01-31 21:04:16,542 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 109 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 15497 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 15708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 15497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:04:16,542 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 131 Invalid, 15708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 15497 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-01-31 21:04:16,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-01-31 21:04:16,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-01-31 21:04:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-31 21:04:16,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-01-31 21:04:16,543 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 169 [2022-01-31 21:04:16,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:04:16,543 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-01-31 21:04:16,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 1.5) internal successors, (165), 109 states have internal predecessors, (165), 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 21:04:16,543 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-01-31 21:04:16,543 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-01-31 21:04:16,545 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-01-31 21:04:16,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-01-31 21:04:16,549 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.