/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:28:37,258 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:28:37,260 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:28:37,297 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:28:37,348 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:28:37,349 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:28:37,349 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:28:37,351 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 21:28:37,358 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:28:37,358 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:28:37,359 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:28:37,359 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:28:37,360 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:28:37,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:28:37,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:28:37,361 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:28:37,362 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:28:37,523 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:28:37,536 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:28:37,537 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:28:37,538 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:28:37,538 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:28:37,539 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c [2022-01-31 21:28:37,584 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359c14859/fc5416a62092461cbb2d64a3c0cf5274/FLAG86738f307 [2022-01-31 21:28:37,924 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:28:37,924 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c [2022-01-31 21:28:37,931 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359c14859/fc5416a62092461cbb2d64a3c0cf5274/FLAG86738f307 [2022-01-31 21:28:37,939 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/359c14859/fc5416a62092461cbb2d64a3c0cf5274 [2022-01-31 21:28:37,941 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:28:37,942 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:28:37,943 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:28:37,943 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:28:37,945 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:28:37,945 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:28:37" (1/1) ... [2022-01-31 21:28:37,946 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@477feda2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:37, skipping insertion in model container [2022-01-31 21:28:37,946 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:28:37" (1/1) ... [2022-01-31 21:28:37,950 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:28:37,957 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:28:38,042 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c[318,331] [2022-01-31 21:28:38,056 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:28:38,070 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:28:38,077 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c[318,331] [2022-01-31 21:28:38,079 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:28:38,087 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:28:38,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38 WrapperNode [2022-01-31 21:28:38,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:28:38,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:28:38,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:28:38,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:28:38,095 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,096 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,101 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,101 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,105 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,106 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,110 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:28:38,110 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:28:38,110 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:28:38,110 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:28:38,111 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (1/1) ... [2022-01-31 21:28:38,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:28:38,123 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:28:38,132 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 21:28:38,138 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 21:28:38,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:28:38,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:28:38,162 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:28:38,162 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:28:38,162 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:28:38,162 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:28:38,162 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:28:38,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:28:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:28:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:28:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:28:38,203 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:28:38,205 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:28:38,279 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:28:38,282 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:28:38,282 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-01-31 21:28:38,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:28:38 BoogieIcfgContainer [2022-01-31 21:28:38,284 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:28:38,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:28:38,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:28:38,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:28:38,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:28:37" (1/3) ... [2022-01-31 21:28:38,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9aeaaa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:28:38, skipping insertion in model container [2022-01-31 21:28:38,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:28:38" (2/3) ... [2022-01-31 21:28:38,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9aeaaa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:28:38, skipping insertion in model container [2022-01-31 21:28:38,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:28:38" (3/3) ... [2022-01-31 21:28:38,301 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_9.c [2022-01-31 21:28:38,304 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:28:38,304 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:28:38,331 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:28:38,350 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 21:28:38,350 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:28:38,367 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 21:28:38,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:28:38,372 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:38,372 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:38,373 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:38,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:38,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1325153485, now seen corresponding path program 1 times [2022-01-31 21:28:38,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:38,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [985413029] [2022-01-31 21:28:38,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:38,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:38,418 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:28:38,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,504 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:38,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:38,513 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:38,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [985413029] [2022-01-31 21:28:38,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [985413029] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:38,514 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:38,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:28:38,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371013088] [2022-01-31 21:28:38,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:38,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:28:38,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:38,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:28:38,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:28:38,537 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 21:28:38,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:38,563 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-01-31 21:28:38,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:28:38,565 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 21:28:38,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:38,568 INFO L225 Difference]: With dead ends: 32 [2022-01-31 21:28:38,569 INFO L226 Difference]: Without dead ends: 13 [2022-01-31 21:28:38,574 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 21:28:38,579 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 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 21:28:38,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:28:38,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-01-31 21:28:38,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-01-31 21:28:38,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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 21:28:38,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-01-31 21:28:38,611 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-01-31 21:28:38,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:38,611 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-01-31 21:28:38,612 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 21:28:38,612 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-01-31 21:28:38,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:28:38,612 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:38,612 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:38,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:28:38,613 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:38,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:38,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2022-01-31 21:28:38,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:38,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801464739] [2022-01-31 21:28:38,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:38,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:38,616 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:28:38,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:38,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,656 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:38,657 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:38,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801464739] [2022-01-31 21:28:38,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [801464739] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:38,657 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:38,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:28:38,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808437897] [2022-01-31 21:28:38,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:38,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:28:38,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:38,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:28:38,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:28:38,659 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 21:28:38,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:38,689 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-01-31 21:28:38,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:28:38,689 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 21:28:38,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:38,690 INFO L225 Difference]: With dead ends: 22 [2022-01-31 21:28:38,690 INFO L226 Difference]: Without dead ends: 15 [2022-01-31 21:28:38,690 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 21:28:38,691 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:38,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:28:38,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-01-31 21:28:38,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-01-31 21:28:38,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 21:28:38,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-01-31 21:28:38,695 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-01-31 21:28:38,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:38,696 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-01-31 21:28:38,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 21:28:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-01-31 21:28:38,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 21:28:38,696 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:38,696 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:38,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:28:38,697 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:38,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:38,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1372110560, now seen corresponding path program 1 times [2022-01-31 21:28:38,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:38,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488722219] [2022-01-31 21:28:38,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:38,761 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:38,766 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:28:38,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:38,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:38,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:38,911 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:38,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488722219] [2022-01-31 21:28:38,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1488722219] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:38,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:38,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 21:28:38,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803674543] [2022-01-31 21:28:38,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:38,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 21:28:38,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:38,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 21:28:38,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:28:38,912 INFO L87 Difference]: Start difference. First operand 15 states and 16 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 21:28:38,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:38,972 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-01-31 21:28:38,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 21:28:38,972 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 21:28:38,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:38,973 INFO L225 Difference]: With dead ends: 22 [2022-01-31 21:28:38,973 INFO L226 Difference]: Without dead ends: 17 [2022-01-31 21:28:38,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:28:38,979 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:38,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:28:38,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-01-31 21:28:38,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-01-31 21:28:38,990 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 21:28:38,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-01-31 21:28:38,991 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-01-31 21:28:38,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:38,991 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-01-31 21:28:38,991 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 21:28:38,991 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-01-31 21:28:38,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 21:28:38,992 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:38,992 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:38,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:28:38,992 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:38,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:38,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1059749499, now seen corresponding path program 1 times [2022-01-31 21:28:38,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:38,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264886239] [2022-01-31 21:28:38,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:39,028 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,028 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:28:39,061 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,139 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,139 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:39,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:39,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:39,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:39,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:39,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:39,365 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:39,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264886239] [2022-01-31 21:28:39,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1264886239] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:39,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:39,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:28:39,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502353189] [2022-01-31 21:28:39,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:39,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:28:39,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:39,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:28:39,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:28:39,368 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:39,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:39,492 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2022-01-31 21:28:39,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 21:28:39,493 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2022-01-31 21:28:39,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:39,495 INFO L225 Difference]: With dead ends: 31 [2022-01-31 21:28:39,495 INFO L226 Difference]: Without dead ends: 21 [2022-01-31 21:28:39,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:28:39,504 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:39,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 36 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:28:39,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-01-31 21:28:39,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-01-31 21:28:39,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 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 21:28:39,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-01-31 21:28:39,513 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2022-01-31 21:28:39,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:39,513 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-01-31 21:28:39,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:39,513 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-01-31 21:28:39,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-31 21:28:39,514 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:39,515 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:39,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:28:39,515 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:39,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:39,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1662437453, now seen corresponding path program 2 times [2022-01-31 21:28:39,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:39,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226250452] [2022-01-31 21:28:39,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:39,582 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,639 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,639 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:39,669 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,727 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:39,728 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:39,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:39,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:39,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:39,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:39,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:39,901 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:39,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226250452] [2022-01-31 21:28:39,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [226250452] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:39,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:39,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-01-31 21:28:39,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635187990] [2022-01-31 21:28:39,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:39,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 21:28:39,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:39,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 21:28:39,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:28:39,903 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 21:28:40,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:40,000 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2022-01-31 21:28:40,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:28:40,001 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 21:28:40,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:40,001 INFO L225 Difference]: With dead ends: 30 [2022-01-31 21:28:40,001 INFO L226 Difference]: Without dead ends: 23 [2022-01-31 21:28:40,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:28:40,002 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:40,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 38 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:28:40,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-01-31 21:28:40,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-01-31 21:28:40,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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 21:28:40,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-01-31 21:28:40,006 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 19 [2022-01-31 21:28:40,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:40,007 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-01-31 21:28:40,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 21:28:40,007 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-01-31 21:28:40,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-01-31 21:28:40,007 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:40,007 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:40,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:28:40,008 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:40,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:40,008 INFO L85 PathProgramCache]: Analyzing trace with hash 361874638, now seen corresponding path program 3 times [2022-01-31 21:28:40,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:40,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498204215] [2022-01-31 21:28:40,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:40,065 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,090 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,091 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:40,115 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,152 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,152 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:40,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:40,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:40,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:40,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:40,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:40,341 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:40,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498204215] [2022-01-31 21:28:40,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1498204215] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:40,341 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:40,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 21:28:40,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688916685] [2022-01-31 21:28:40,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:40,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 21:28:40,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:40,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 21:28:40,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:28:40,342 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:40,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:40,468 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2022-01-31 21:28:40,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 21:28:40,469 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 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 21 [2022-01-31 21:28:40,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:40,469 INFO L225 Difference]: With dead ends: 32 [2022-01-31 21:28:40,469 INFO L226 Difference]: Without dead ends: 25 [2022-01-31 21:28:40,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:28:40,470 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:40,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 43 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:40,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-01-31 21:28:40,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-01-31 21:28:40,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 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 21:28:40,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-01-31 21:28:40,474 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2022-01-31 21:28:40,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:40,474 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-01-31 21:28:40,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-01-31 21:28:40,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 21:28:40,475 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:40,475 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:40,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:28:40,475 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:40,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:40,475 INFO L85 PathProgramCache]: Analyzing trace with hash 105609001, now seen corresponding path program 4 times [2022-01-31 21:28:40,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:40,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151790467] [2022-01-31 21:28:40,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:40,528 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,557 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,558 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:40,586 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,627 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:40,627 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:40,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:40,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:40,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:40,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:40,818 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:40,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151790467] [2022-01-31 21:28:40,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [151790467] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:40,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:40,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-01-31 21:28:40,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113041805] [2022-01-31 21:28:40,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:40,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 21:28:40,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:40,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 21:28:40,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:28:40,820 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:40,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:40,948 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-01-31 21:28:40,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:28:40,948 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-01-31 21:28:40,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:40,949 INFO L225 Difference]: With dead ends: 34 [2022-01-31 21:28:40,949 INFO L226 Difference]: Without dead ends: 27 [2022-01-31 21:28:40,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:28:40,949 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:40,950 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 33 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:40,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-31 21:28:40,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-01-31 21:28:40,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 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 21:28:40,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-01-31 21:28:40,953 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2022-01-31 21:28:40,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:40,953 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-01-31 21:28:40,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:40,954 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-01-31 21:28:40,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:28:40,954 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:40,954 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:40,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:28:40,954 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:40,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:40,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1352532284, now seen corresponding path program 5 times [2022-01-31 21:28:40,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:40,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877656483] [2022-01-31 21:28:40,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:40,992 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,011 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,011 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,029 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,065 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,066 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:41,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:41,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:41,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:41,125 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:41,252 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:41,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877656483] [2022-01-31 21:28:41,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1877656483] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:41,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:41,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:28:41,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442736181] [2022-01-31 21:28:41,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:41,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:28:41,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:41,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:28:41,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:28:41,254 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 21:28:41,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:41,422 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-01-31 21:28:41,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-31 21:28:41,423 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 21:28:41,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:41,423 INFO L225 Difference]: With dead ends: 36 [2022-01-31 21:28:41,423 INFO L226 Difference]: Without dead ends: 29 [2022-01-31 21:28:41,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:28:41,424 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:41,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 48 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:41,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-31 21:28:41,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-01-31 21:28:41,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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 21:28:41,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2022-01-31 21:28:41,428 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2022-01-31 21:28:41,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:41,428 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2022-01-31 21:28:41,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 21:28:41,428 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2022-01-31 21:28:41,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-31 21:28:41,428 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:41,428 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:41,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:28:41,429 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:41,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:41,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1827998623, now seen corresponding path program 6 times [2022-01-31 21:28:41,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:41,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163009315] [2022-01-31 21:28:41,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:41,480 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,505 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,506 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,527 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,579 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:41,580 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:41,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:41,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:41,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:41,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:41,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:41,791 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:41,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163009315] [2022-01-31 21:28:41,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [163009315] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:41,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:41,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:28:41,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090127921] [2022-01-31 21:28:41,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:41,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:28:41,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:41,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:28:41,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:28:41,792 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:41,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:41,980 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2022-01-31 21:28:41,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:28:41,981 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 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 27 [2022-01-31 21:28:41,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:41,981 INFO L225 Difference]: With dead ends: 38 [2022-01-31 21:28:41,981 INFO L226 Difference]: Without dead ends: 31 [2022-01-31 21:28:41,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:28:41,982 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 23 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:41,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 38 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:41,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-01-31 21:28:41,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-01-31 21:28:41,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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 21:28:41,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2022-01-31 21:28:41,986 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 27 [2022-01-31 21:28:41,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:41,986 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2022-01-31 21:28:41,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:41,986 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2022-01-31 21:28:41,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-31 21:28:41,986 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:41,986 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:41,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:28:41,987 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:41,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:41,989 INFO L85 PathProgramCache]: Analyzing trace with hash 301485498, now seen corresponding path program 7 times [2022-01-31 21:28:41,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:41,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724732077] [2022-01-31 21:28:41,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:42,032 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,052 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,052 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:42,070 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,121 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,122 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:42,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:42,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:42,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:42,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:42,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:42,343 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:42,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724732077] [2022-01-31 21:28:42,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [724732077] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:42,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:42,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-01-31 21:28:42,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843310955] [2022-01-31 21:28:42,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:42,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-31 21:28:42,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:42,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-31 21:28:42,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:28:42,344 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:42,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:42,564 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2022-01-31 21:28:42,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-01-31 21:28:42,564 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-01-31 21:28:42,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:42,565 INFO L225 Difference]: With dead ends: 40 [2022-01-31 21:28:42,565 INFO L226 Difference]: Without dead ends: 33 [2022-01-31 21:28:42,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:28:42,566 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:42,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 63 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:42,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-01-31 21:28:42,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-01-31 21:28:42,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 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 21:28:42,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2022-01-31 21:28:42,569 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2022-01-31 21:28:42,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:42,569 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2022-01-31 21:28:42,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:42,569 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2022-01-31 21:28:42,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-01-31 21:28:42,570 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:42,570 INFO L514 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:42,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:28:42,570 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:42,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:42,570 INFO L85 PathProgramCache]: Analyzing trace with hash -2093779691, now seen corresponding path program 8 times [2022-01-31 21:28:42,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:42,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819058980] [2022-01-31 21:28:42,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:42,615 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,636 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,636 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:42,654 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,704 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:42,705 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:42,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:42,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:42,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:42,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:42,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:42,947 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:42,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819058980] [2022-01-31 21:28:42,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1819058980] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:42,947 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:42,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:28:42,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601151214] [2022-01-31 21:28:42,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:42,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:28:42,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:42,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:28:42,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:28:42,948 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 21:28:43,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:43,201 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2022-01-31 21:28:43,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:28:43,201 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 21:28:43,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:43,202 INFO L225 Difference]: With dead ends: 42 [2022-01-31 21:28:43,202 INFO L226 Difference]: Without dead ends: 35 [2022-01-31 21:28:43,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:28:43,202 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:43,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 43 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:43,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-01-31 21:28:43,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-01-31 21:28:43,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 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 21:28:43,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2022-01-31 21:28:43,206 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2022-01-31 21:28:43,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:43,206 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2022-01-31 21:28:43,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 21:28:43,207 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2022-01-31 21:28:43,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-01-31 21:28:43,207 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:43,207 INFO L514 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:43,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:28:43,207 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:43,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:43,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1841155664, now seen corresponding path program 9 times [2022-01-31 21:28:43,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:43,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695068184] [2022-01-31 21:28:43,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:43,255 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,275 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,275 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:43,298 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,346 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:43,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:43,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:43,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:43,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:43,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:43,591 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:43,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695068184] [2022-01-31 21:28:43,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [695068184] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:43,591 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:43,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:28:43,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054307641] [2022-01-31 21:28:43,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:43,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:28:43,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:43,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:28:43,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:28:43,593 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:43,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:43,885 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2022-01-31 21:28:43,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:28:43,886 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 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 33 [2022-01-31 21:28:43,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:43,886 INFO L225 Difference]: With dead ends: 44 [2022-01-31 21:28:43,886 INFO L226 Difference]: Without dead ends: 37 [2022-01-31 21:28:43,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:28:43,887 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:43,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 78 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:28:43,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-01-31 21:28:43,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-01-31 21:28:43,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.125) internal successors, (36), 32 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 21:28:43,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2022-01-31 21:28:43,891 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 33 [2022-01-31 21:28:43,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:43,891 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2022-01-31 21:28:43,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:43,891 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2022-01-31 21:28:43,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-01-31 21:28:43,892 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:43,892 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:43,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:28:43,892 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:43,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:43,892 INFO L85 PathProgramCache]: Analyzing trace with hash 412365707, now seen corresponding path program 10 times [2022-01-31 21:28:43,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:43,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064565056] [2022-01-31 21:28:43,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:43,940 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,957 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:43,958 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:43,982 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,025 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,026 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:44,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:44,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:44,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:44,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:44,085 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 21:28:44,296 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:44,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064565056] [2022-01-31 21:28:44,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1064565056] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:44,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:44,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:28:44,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35039250] [2022-01-31 21:28:44,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:44,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:28:44,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:44,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:28:44,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:28:44,298 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:44,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:44,621 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-01-31 21:28:44,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:28:44,622 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-01-31 21:28:44,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:44,622 INFO L225 Difference]: With dead ends: 46 [2022-01-31 21:28:44,622 INFO L226 Difference]: Without dead ends: 39 [2022-01-31 21:28:44,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:28:44,623 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 31 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:44,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 53 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:44,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-31 21:28:44,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-01-31 21:28:44,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 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 21:28:44,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2022-01-31 21:28:44,628 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2022-01-31 21:28:44,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:44,628 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2022-01-31 21:28:44,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:44,628 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2022-01-31 21:28:44,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:28:44,629 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:44,629 INFO L514 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:44,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:28:44,629 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:44,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:44,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1382886054, now seen corresponding path program 11 times [2022-01-31 21:28:44,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:44,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768285817] [2022-01-31 21:28:44,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:44,665 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,687 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,687 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:44,704 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,739 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:44,740 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:44,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:44,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:44,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:44,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:44,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:45,025 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:45,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768285817] [2022-01-31 21:28:45,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [768285817] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:45,025 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:45,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:28:45,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058315934] [2022-01-31 21:28:45,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:45,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:28:45,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:45,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:28:45,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:28:45,026 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 21:28:45,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:45,358 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-01-31 21:28:45,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:28:45,359 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 21:28:45,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:45,359 INFO L225 Difference]: With dead ends: 48 [2022-01-31 21:28:45,359 INFO L226 Difference]: Without dead ends: 41 [2022-01-31 21:28:45,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=1091, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:28:45,360 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:45,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 63 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:45,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-01-31 21:28:45,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-01-31 21:28:45,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 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 21:28:45,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2022-01-31 21:28:45,364 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 37 [2022-01-31 21:28:45,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:45,364 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2022-01-31 21:28:45,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 21:28:45,364 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2022-01-31 21:28:45,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-01-31 21:28:45,364 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:45,364 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:45,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:28:45,365 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:45,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:45,365 INFO L85 PathProgramCache]: Analyzing trace with hash 2045036289, now seen corresponding path program 12 times [2022-01-31 21:28:45,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:45,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989672001] [2022-01-31 21:28:45,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:45,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:45,413 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:45,413 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:45,431 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:45,463 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:45,463 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:45,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:45,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:45,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:45,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:45,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:45,771 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:45,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989672001] [2022-01-31 21:28:45,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1989672001] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:45,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:45,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:28:45,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933825366] [2022-01-31 21:28:45,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:45,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:28:45,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:45,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:28:45,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:28:45,772 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:46,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:46,139 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2022-01-31 21:28:46,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:28:46,140 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 2 states have call successors, (3), 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 39 [2022-01-31 21:28:46,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:46,140 INFO L225 Difference]: With dead ends: 50 [2022-01-31 21:28:46,140 INFO L226 Difference]: Without dead ends: 43 [2022-01-31 21:28:46,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=1226, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:28:46,141 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:46,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 43 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:46,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-01-31 21:28:46,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-01-31 21:28:46,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 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 21:28:46,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2022-01-31 21:28:46,145 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 39 [2022-01-31 21:28:46,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:46,145 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2022-01-31 21:28:46,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:46,145 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2022-01-31 21:28:46,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-31 21:28:46,145 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:46,145 INFO L514 BasicCegarLoop]: trace histogram [15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:46,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:28:46,146 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:46,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:46,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1578714980, now seen corresponding path program 13 times [2022-01-31 21:28:46,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:46,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988840120] [2022-01-31 21:28:46,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:46,195 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:46,216 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:46,216 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:46,235 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:46,268 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:46,269 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:46,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:46,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:46,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:46,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:46,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:46,594 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:46,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988840120] [2022-01-31 21:28:46,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1988840120] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:46,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:46,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:28:46,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165708065] [2022-01-31 21:28:46,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:46,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:28:46,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:46,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:28:46,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:28:46,595 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:47,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:47,021 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2022-01-31 21:28:47,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:28:47,022 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-01-31 21:28:47,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:47,022 INFO L225 Difference]: With dead ends: 52 [2022-01-31 21:28:47,022 INFO L226 Difference]: Without dead ends: 45 [2022-01-31 21:28:47,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=191, Invalid=1369, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:28:47,023 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:47,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 98 Invalid, 659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:47,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-31 21:28:47,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-01-31 21:28:47,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 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 21:28:47,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2022-01-31 21:28:47,027 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2022-01-31 21:28:47,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:47,027 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2022-01-31 21:28:47,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:47,027 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2022-01-31 21:28:47,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:28:47,028 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:47,028 INFO L514 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:47,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:28:47,028 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:47,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:47,028 INFO L85 PathProgramCache]: Analyzing trace with hash -785207433, now seen corresponding path program 14 times [2022-01-31 21:28:47,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:47,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932607831] [2022-01-31 21:28:47,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:47,072 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:47,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:47,097 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:47,119 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:47,167 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:47,167 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:47,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:47,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:47,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:47,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:47,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:47,534 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:47,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932607831] [2022-01-31 21:28:47,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1932607831] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:47,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:47,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:28:47,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490682882] [2022-01-31 21:28:47,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:47,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:28:47,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:47,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:28:47,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:28:47,535 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 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 21:28:47,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:47,995 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2022-01-31 21:28:47,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:28:47,995 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 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 21:28:47,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:47,996 INFO L225 Difference]: With dead ends: 54 [2022-01-31 21:28:47,996 INFO L226 Difference]: Without dead ends: 47 [2022-01-31 21:28:47,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=1520, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:28:47,997 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 39 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:47,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 88 Invalid, 700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:47,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-01-31 21:28:48,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-01-31 21:28:48,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 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 21:28:48,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2022-01-31 21:28:48,002 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 43 [2022-01-31 21:28:48,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:48,002 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2022-01-31 21:28:48,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 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 21:28:48,003 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2022-01-31 21:28:48,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-01-31 21:28:48,003 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:48,003 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:48,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:28:48,003 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:48,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:48,004 INFO L85 PathProgramCache]: Analyzing trace with hash 1566333842, now seen corresponding path program 15 times [2022-01-31 21:28:48,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:48,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971640283] [2022-01-31 21:28:48,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:48,058 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:48,075 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:48,075 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:48,100 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:48,156 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:48,156 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:48,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:48,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:48,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:48,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:48,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:48,505 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:48,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971640283] [2022-01-31 21:28:48,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1971640283] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:48,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:48,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:28:48,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398385396] [2022-01-31 21:28:48,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:48,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:28:48,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:48,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:28:48,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:28:48,507 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:49,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:49,000 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2022-01-31 21:28:49,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:28:49,001 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 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 45 [2022-01-31 21:28:49,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:49,001 INFO L225 Difference]: With dead ends: 56 [2022-01-31 21:28:49,001 INFO L226 Difference]: Without dead ends: 49 [2022-01-31 21:28:49,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=213, Invalid=1679, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:28:49,002 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 41 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:49,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 88 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 754 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:28:49,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-01-31 21:28:49,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-01-31 21:28:49,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 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 21:28:49,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2022-01-31 21:28:49,006 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 45 [2022-01-31 21:28:49,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:49,006 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2022-01-31 21:28:49,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:49,006 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2022-01-31 21:28:49,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 21:28:49,007 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:49,007 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:49,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:28:49,007 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:49,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:49,007 INFO L85 PathProgramCache]: Analyzing trace with hash -2050265875, now seen corresponding path program 16 times [2022-01-31 21:28:49,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:49,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165771494] [2022-01-31 21:28:49,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:49,051 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:49,069 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:49,070 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:49,090 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:49,122 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:49,123 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:49,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:49,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:49,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:49,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:49,192 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:49,516 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:49,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165771494] [2022-01-31 21:28:49,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [165771494] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:49,516 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:49,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:28:49,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476794127] [2022-01-31 21:28:49,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:49,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:28:49,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:49,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:28:49,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:28:49,517 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:50,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:50,031 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2022-01-31 21:28:50,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:28:50,031 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-01-31 21:28:50,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:50,032 INFO L225 Difference]: With dead ends: 58 [2022-01-31 21:28:50,032 INFO L226 Difference]: Without dead ends: 51 [2022-01-31 21:28:50,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=224, Invalid=1846, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:28:50,033 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 43 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 731 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 731 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:50,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 58 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 731 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:28:50,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-01-31 21:28:50,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-01-31 21:28:50,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 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 21:28:50,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2022-01-31 21:28:50,037 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2022-01-31 21:28:50,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:50,037 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2022-01-31 21:28:50,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:50,037 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2022-01-31 21:28:50,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:28:50,038 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:50,038 INFO L514 BasicCegarLoop]: trace histogram [19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:50,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:28:50,038 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:50,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:50,038 INFO L85 PathProgramCache]: Analyzing trace with hash 1320915848, now seen corresponding path program 17 times [2022-01-31 21:28:50,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:50,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130469510] [2022-01-31 21:28:50,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:50,073 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:50,094 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:50,094 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:50,110 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:50,151 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:50,151 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:50,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:50,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:50,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:50,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:50,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:50,580 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:50,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130469510] [2022-01-31 21:28:50,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2130469510] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:50,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:50,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:28:50,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369776190] [2022-01-31 21:28:50,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:50,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:28:50,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:50,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:28:50,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:28:50,582 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 21:28:51,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:51,201 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2022-01-31 21:28:51,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:28:51,202 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 21:28:51,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:51,202 INFO L225 Difference]: With dead ends: 60 [2022-01-31 21:28:51,202 INFO L226 Difference]: Without dead ends: 53 [2022-01-31 21:28:51,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=235, Invalid=2021, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:28:51,203 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 45 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:51,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 118 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:28:51,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-01-31 21:28:51,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-01-31 21:28:51,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 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 21:28:51,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2022-01-31 21:28:51,207 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2022-01-31 21:28:51,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:51,208 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2022-01-31 21:28:51,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 21:28:51,208 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2022-01-31 21:28:51,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-01-31 21:28:51,208 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:51,208 INFO L514 BasicCegarLoop]: trace histogram [20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:51,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:28:51,208 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:51,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:51,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1673756829, now seen corresponding path program 18 times [2022-01-31 21:28:51,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:51,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738291928] [2022-01-31 21:28:51,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:51,252 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:51,273 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:51,273 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:51,288 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:51,320 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:51,320 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:51,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:51,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:51,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:51,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:51,744 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:51,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738291928] [2022-01-31 21:28:51,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1738291928] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:51,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:51,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:28:51,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372792866] [2022-01-31 21:28:51,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:51,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:28:51,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:51,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:28:51,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:28:51,752 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:52,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:52,356 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2022-01-31 21:28:52,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:28:52,356 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 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 51 [2022-01-31 21:28:52,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:52,356 INFO L225 Difference]: With dead ends: 62 [2022-01-31 21:28:52,356 INFO L226 Difference]: Without dead ends: 55 [2022-01-31 21:28:52,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=246, Invalid=2204, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:28:52,357 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:52,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 58 Invalid, 926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:28:52,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-01-31 21:28:52,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-01-31 21:28:52,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 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 21:28:52,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-01-31 21:28:52,362 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 51 [2022-01-31 21:28:52,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:52,362 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-01-31 21:28:52,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:52,362 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-01-31 21:28:52,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:28:52,362 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:52,362 INFO L514 BasicCegarLoop]: trace histogram [21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:52,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:28:52,363 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:52,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:52,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1926111106, now seen corresponding path program 19 times [2022-01-31 21:28:52,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:52,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876857851] [2022-01-31 21:28:52,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:52,394 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:52,411 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:52,411 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:52,450 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:52,483 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:52,483 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:52,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:52,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:52,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:52,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:52,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:52,930 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:52,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876857851] [2022-01-31 21:28:52,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [876857851] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:52,930 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:52,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:28:52,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779376513] [2022-01-31 21:28:52,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:52,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:28:52,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:52,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:28:52,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=765, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:28:52,931 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:53,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:53,640 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2022-01-31 21:28:53,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:28:53,643 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-01-31 21:28:53,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:53,644 INFO L225 Difference]: With dead ends: 64 [2022-01-31 21:28:53,644 INFO L226 Difference]: Without dead ends: 57 [2022-01-31 21:28:53,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=257, Invalid=2395, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:28:53,645 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 49 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 1073 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 1120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1073 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:53,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 93 Invalid, 1120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1073 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:28:53,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-01-31 21:28:53,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-01-31 21:28:53,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 52 states have internal predecessors, (56), 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 21:28:53,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2022-01-31 21:28:53,649 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 53 [2022-01-31 21:28:53,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:53,649 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2022-01-31 21:28:53,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:53,649 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2022-01-31 21:28:53,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:28:53,649 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:53,650 INFO L514 BasicCegarLoop]: trace histogram [22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:53,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:28:53,650 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:53,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:53,650 INFO L85 PathProgramCache]: Analyzing trace with hash 374564569, now seen corresponding path program 20 times [2022-01-31 21:28:53,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:53,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572983640] [2022-01-31 21:28:53,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:53,687 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:53,702 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:53,702 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:53,724 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:53,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:53,766 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:53,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:53,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:53,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:53,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:53,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:54,236 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:54,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572983640] [2022-01-31 21:28:54,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1572983640] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:54,236 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:54,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:28:54,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297703101] [2022-01-31 21:28:54,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:54,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:28:54,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:54,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:28:54,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:28:54,237 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 21:28:54,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:54,917 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2022-01-31 21:28:54,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:28:54,917 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 21:28:54,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:54,918 INFO L225 Difference]: With dead ends: 66 [2022-01-31 21:28:54,918 INFO L226 Difference]: Without dead ends: 59 [2022-01-31 21:28:54,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=268, Invalid=2594, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:28:54,919 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 51 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 1083 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1083 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:54,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 58 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1083 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:28:54,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-01-31 21:28:54,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-01-31 21:28:54,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 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 21:28:54,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2022-01-31 21:28:54,923 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 55 [2022-01-31 21:28:54,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:54,923 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2022-01-31 21:28:54,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 21:28:54,923 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2022-01-31 21:28:54,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-01-31 21:28:54,924 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:54,924 INFO L514 BasicCegarLoop]: trace histogram [23, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:54,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:28:54,924 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:54,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:54,924 INFO L85 PathProgramCache]: Analyzing trace with hash -584269196, now seen corresponding path program 21 times [2022-01-31 21:28:54,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:54,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52173037] [2022-01-31 21:28:54,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:54,967 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:54,981 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:54,981 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:54,998 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:55,045 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:55,045 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:55,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:55,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:55,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:55,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:55,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:55,531 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:55,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52173037] [2022-01-31 21:28:55,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [52173037] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:55,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:55,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:28:55,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958229551] [2022-01-31 21:28:55,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:55,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:28:55,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:55,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:28:55,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:28:55,532 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:56,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:56,278 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2022-01-31 21:28:56,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:28:56,278 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 states have internal predecessors, (53), 2 states have call successors, (3), 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 57 [2022-01-31 21:28:56,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:56,279 INFO L225 Difference]: With dead ends: 68 [2022-01-31 21:28:56,279 INFO L226 Difference]: Without dead ends: 61 [2022-01-31 21:28:56,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=279, Invalid=2801, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:28:56,280 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 53 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:56,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 113 Invalid, 1308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:28:56,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-01-31 21:28:56,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-01-31 21:28:56,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 56 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 21:28:56,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-01-31 21:28:56,284 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 57 [2022-01-31 21:28:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:56,284 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-01-31 21:28:56,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:56,285 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-01-31 21:28:56,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:28:56,285 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:56,285 INFO L514 BasicCegarLoop]: trace histogram [24, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:56,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:28:56,285 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:56,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:56,285 INFO L85 PathProgramCache]: Analyzing trace with hash 1394451279, now seen corresponding path program 22 times [2022-01-31 21:28:56,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:56,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989316015] [2022-01-31 21:28:56,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:56,353 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:56,370 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:56,370 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:56,422 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:56,465 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:56,465 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:56,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:56,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:56,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:56,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:56,961 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:56,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989316015] [2022-01-31 21:28:56,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [989316015] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:56,961 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:56,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:28:56,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699842825] [2022-01-31 21:28:56,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:56,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:28:56,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:56,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:28:56,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=939, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:28:56,963 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:57,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:57,770 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2022-01-31 21:28:57,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:28:57,770 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2022-01-31 21:28:57,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:57,770 INFO L225 Difference]: With dead ends: 70 [2022-01-31 21:28:57,770 INFO L226 Difference]: Without dead ends: 63 [2022-01-31 21:28:57,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=290, Invalid=3016, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:28:57,772 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 55 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1394 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:57,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 133 Invalid, 1447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1394 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:28:57,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-31 21:28:57,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-01-31 21:28:57,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 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 21:28:57,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2022-01-31 21:28:57,776 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 59 [2022-01-31 21:28:57,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:57,776 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2022-01-31 21:28:57,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:57,776 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2022-01-31 21:28:57,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:28:57,777 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:57,777 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:57,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:28:57,777 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:57,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:57,777 INFO L85 PathProgramCache]: Analyzing trace with hash 274315626, now seen corresponding path program 23 times [2022-01-31 21:28:57,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:57,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657214306] [2022-01-31 21:28:57,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:57,819 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:57,842 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:57,842 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:57,864 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:57,907 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:57,907 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:57,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:57,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:57,961 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:57,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:57,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:58,446 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:58,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657214306] [2022-01-31 21:28:58,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [657214306] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:58,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:58,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:28:58,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772659247] [2022-01-31 21:28:58,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:58,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:28:58,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:58,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:28:58,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1001, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:28:58,447 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 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 21:28:59,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:59,289 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2022-01-31 21:28:59,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:28:59,289 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 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 21:28:59,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:59,290 INFO L225 Difference]: With dead ends: 72 [2022-01-31 21:28:59,290 INFO L226 Difference]: Without dead ends: 65 [2022-01-31 21:28:59,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=301, Invalid=3239, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:28:59,291 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 57 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 1458 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 1513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:59,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 118 Invalid, 1513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1458 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:28:59,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-01-31 21:28:59,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-01-31 21:28:59,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 60 states have internal predecessors, (64), 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 21:28:59,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2022-01-31 21:28:59,296 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 61 [2022-01-31 21:28:59,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:59,296 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2022-01-31 21:28:59,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 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 21:28:59,296 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2022-01-31 21:28:59,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-01-31 21:28:59,297 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:59,297 INFO L514 BasicCegarLoop]: trace histogram [26, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:59,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:28:59,297 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:59,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:59,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1860744389, now seen corresponding path program 24 times [2022-01-31 21:28:59,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:59,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071123074] [2022-01-31 21:28:59,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:59,327 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:59,350 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:59,351 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:59,366 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:59,395 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:59,395 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:59,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:59,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:59,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:59,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:59,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:59,975 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:59,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071123074] [2022-01-31 21:28:59,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2071123074] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:59,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:59,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:28:59,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572893267] [2022-01-31 21:28:59,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:59,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:28:59,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:59,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:28:59,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:28:59,977 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:00,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:00,878 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2022-01-31 21:29:00,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:29:00,879 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 2 states have call successors, (3), 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 63 [2022-01-31 21:29:00,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:00,880 INFO L225 Difference]: With dead ends: 74 [2022-01-31 21:29:00,880 INFO L226 Difference]: Without dead ends: 67 [2022-01-31 21:29:00,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=312, Invalid=3470, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:29:00,881 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 59 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 1548 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 1605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:00,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 93 Invalid, 1605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1548 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:29:00,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-01-31 21:29:00,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-01-31 21:29:00,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.064516129032258) internal successors, (66), 62 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 21:29:00,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2022-01-31 21:29:00,885 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 63 [2022-01-31 21:29:00,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:00,885 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2022-01-31 21:29:00,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:00,886 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2022-01-31 21:29:00,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:29:00,886 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:00,886 INFO L514 BasicCegarLoop]: trace histogram [27, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:00,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:29:00,886 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:00,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:00,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1705395552, now seen corresponding path program 25 times [2022-01-31 21:29:00,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:00,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341485205] [2022-01-31 21:29:00,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:00,918 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:00,938 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:00,938 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:00,954 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:00,995 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:00,996 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:00,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:01,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:01,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:01,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:01,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:01,594 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:01,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341485205] [2022-01-31 21:29:01,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1341485205] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:01,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:01,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:29:01,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855219244] [2022-01-31 21:29:01,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:01,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:29:01,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:01,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:29:01,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1131, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:29:01,596 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:02,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:02,557 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2022-01-31 21:29:02,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:29:02,557 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-01-31 21:29:02,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:02,558 INFO L225 Difference]: With dead ends: 76 [2022-01-31 21:29:02,558 INFO L226 Difference]: Without dead ends: 69 [2022-01-31 21:29:02,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=323, Invalid=3709, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:29:02,559 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 61 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1686 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 1745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:02,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 128 Invalid, 1745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1686 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:29:02,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-01-31 21:29:02,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-01-31 21:29:02,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.0625) internal successors, (68), 64 states have internal predecessors, (68), 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 21:29:02,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2022-01-31 21:29:02,564 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 65 [2022-01-31 21:29:02,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:02,564 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2022-01-31 21:29:02,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:02,564 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2022-01-31 21:29:02,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:29:02,564 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:02,564 INFO L514 BasicCegarLoop]: trace histogram [28, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:02,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:29:02,564 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:02,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:02,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1555948741, now seen corresponding path program 26 times [2022-01-31 21:29:02,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:02,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395496091] [2022-01-31 21:29:02,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:02,606 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:02,627 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:02,627 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:02,648 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:02,679 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:02,679 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:02,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:02,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:02,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:02,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:02,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:03,279 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:03,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395496091] [2022-01-31 21:29:03,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [395496091] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:03,279 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:03,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:29:03,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919695908] [2022-01-31 21:29:03,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:03,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:29:03,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:03,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:29:03,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1199, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:29:03,281 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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 21:29:04,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:04,317 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2022-01-31 21:29:04,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:29:04,317 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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 21:29:04,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:04,318 INFO L225 Difference]: With dead ends: 78 [2022-01-31 21:29:04,318 INFO L226 Difference]: Without dead ends: 71 [2022-01-31 21:29:04,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=334, Invalid=3956, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 21:29:04,319 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 63 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1887 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 1948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:04,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 148 Invalid, 1948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1887 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:29:04,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-01-31 21:29:04,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-01-31 21:29:04,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 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 21:29:04,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2022-01-31 21:29:04,323 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 67 [2022-01-31 21:29:04,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:04,324 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2022-01-31 21:29:04,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 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 21:29:04,325 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2022-01-31 21:29:04,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-01-31 21:29:04,325 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:04,325 INFO L514 BasicCegarLoop]: trace histogram [29, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:04,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:29:04,325 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:04,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:04,325 INFO L85 PathProgramCache]: Analyzing trace with hash -381688234, now seen corresponding path program 27 times [2022-01-31 21:29:04,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:04,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623180343] [2022-01-31 21:29:04,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:04,362 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,386 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:04,405 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,447 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:04,447 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:04,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:04,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:04,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:04,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:05,103 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:05,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623180343] [2022-01-31 21:29:05,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [623180343] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:05,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:05,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:29:05,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874553073] [2022-01-31 21:29:05,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:05,104 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:29:05,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:05,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:29:05,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1269, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:29:05,104 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:06,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:06,221 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2022-01-31 21:29:06,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:29:06,221 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 states have internal predecessors, (65), 2 states have call successors, (3), 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 69 [2022-01-31 21:29:06,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:06,222 INFO L225 Difference]: With dead ends: 80 [2022-01-31 21:29:06,222 INFO L226 Difference]: Without dead ends: 73 [2022-01-31 21:29:06,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=345, Invalid=4211, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:29:06,223 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 65 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1914 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:06,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 108 Invalid, 1977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1914 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:29:06,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-01-31 21:29:06,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-01-31 21:29:06,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 68 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 21:29:06,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2022-01-31 21:29:06,227 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 69 [2022-01-31 21:29:06,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:06,228 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2022-01-31 21:29:06,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:06,228 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2022-01-31 21:29:06,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-31 21:29:06,228 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:06,228 INFO L514 BasicCegarLoop]: trace histogram [30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:06,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:29:06,228 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:06,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:06,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1493739855, now seen corresponding path program 28 times [2022-01-31 21:29:06,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:06,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730299153] [2022-01-31 21:29:06,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:06,273 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:06,292 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:06,293 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:06,308 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:06,338 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:06,338 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:06,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:06,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:06,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:06,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:06,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:07,031 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:07,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730299153] [2022-01-31 21:29:07,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [730299153] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:07,032 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:07,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:29:07,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156270440] [2022-01-31 21:29:07,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:07,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:29:07,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:07,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:29:07,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1341, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:29:07,033 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:08,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:08,144 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2022-01-31 21:29:08,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:29:08,145 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2022-01-31 21:29:08,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:08,145 INFO L225 Difference]: With dead ends: 82 [2022-01-31 21:29:08,145 INFO L226 Difference]: Without dead ends: 75 [2022-01-31 21:29:08,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=356, Invalid=4474, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:29:08,147 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 67 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 1937 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 2002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:08,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 88 Invalid, 2002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1937 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:29:08,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-01-31 21:29:08,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-01-31 21:29:08,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 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 21:29:08,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2022-01-31 21:29:08,151 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 71 [2022-01-31 21:29:08,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:08,151 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2022-01-31 21:29:08,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:08,151 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2022-01-31 21:29:08,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:29:08,152 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:08,152 INFO L514 BasicCegarLoop]: trace histogram [31, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:08,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:29:08,152 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:08,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:08,152 INFO L85 PathProgramCache]: Analyzing trace with hash -728490932, now seen corresponding path program 29 times [2022-01-31 21:29:08,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:08,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878809075] [2022-01-31 21:29:08,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:08,193 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:08,214 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:08,214 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:08,228 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:08,259 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:08,259 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:08,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:08,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:08,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:08,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:08,323 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 21:29:08,950 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:08,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878809075] [2022-01-31 21:29:08,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1878809075] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:08,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:08,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:29:08,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19895523] [2022-01-31 21:29:08,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:08,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:29:08,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:08,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:29:08,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:29:08,952 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 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 21:29:10,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:10,163 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2022-01-31 21:29:10,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:29:10,163 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 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 21:29:10,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:10,164 INFO L225 Difference]: With dead ends: 84 [2022-01-31 21:29:10,164 INFO L226 Difference]: Without dead ends: 77 [2022-01-31 21:29:10,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=367, Invalid=4745, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:29:10,165 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 69 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 2080 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:10,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 98 Invalid, 2147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2080 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:29:10,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-01-31 21:29:10,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-01-31 21:29:10,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 72 states have internal predecessors, (76), 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 21:29:10,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2022-01-31 21:29:10,169 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 73 [2022-01-31 21:29:10,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:10,169 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2022-01-31 21:29:10,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 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 21:29:10,170 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2022-01-31 21:29:10,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-01-31 21:29:10,170 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:10,170 INFO L514 BasicCegarLoop]: trace histogram [32, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:10,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:29:10,170 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:10,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:10,170 INFO L85 PathProgramCache]: Analyzing trace with hash 236316455, now seen corresponding path program 30 times [2022-01-31 21:29:10,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:10,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39737858] [2022-01-31 21:29:10,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:10,220 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:10,235 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:10,235 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:10,253 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:10,285 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:10,286 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:10,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:10,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:10,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:10,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:10,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:11,009 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:11,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39737858] [2022-01-31 21:29:11,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [39737858] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:11,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:11,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:29:11,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953322803] [2022-01-31 21:29:11,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:11,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:29:11,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:11,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:29:11,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1491, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:29:11,011 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:12,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:12,284 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2022-01-31 21:29:12,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:29:12,285 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 2 states have call successors, (3), 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 75 [2022-01-31 21:29:12,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:12,285 INFO L225 Difference]: With dead ends: 86 [2022-01-31 21:29:12,285 INFO L226 Difference]: Without dead ends: 79 [2022-01-31 21:29:12,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=378, Invalid=5024, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:29:12,286 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 71 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2062 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 2131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2062 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:12,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 33 Invalid, 2131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2062 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:29:12,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-01-31 21:29:12,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-01-31 21:29:12,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.054054054054054) internal successors, (78), 74 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 21:29:12,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2022-01-31 21:29:12,292 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 75 [2022-01-31 21:29:12,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:12,292 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2022-01-31 21:29:12,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:12,292 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2022-01-31 21:29:12,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:29:12,292 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:12,292 INFO L514 BasicCegarLoop]: trace histogram [33, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:12,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:29:12,293 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:12,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:12,293 INFO L85 PathProgramCache]: Analyzing trace with hash -296720574, now seen corresponding path program 31 times [2022-01-31 21:29:12,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:12,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895218549] [2022-01-31 21:29:12,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:12,345 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:12,360 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:12,360 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:12,382 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:12,422 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:12,423 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:12,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:12,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:12,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:12,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:12,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:13,159 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:13,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895218549] [2022-01-31 21:29:13,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [895218549] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:13,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:13,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:29:13,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238507443] [2022-01-31 21:29:13,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:13,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:29:13,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:13,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:29:13,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1569, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:29:13,161 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:14,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:14,537 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-01-31 21:29:14,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:29:14,537 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-01-31 21:29:14,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:14,537 INFO L225 Difference]: With dead ends: 88 [2022-01-31 21:29:14,537 INFO L226 Difference]: Without dead ends: 81 [2022-01-31 21:29:14,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=389, Invalid=5311, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:29:14,539 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 73 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 2480 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 2551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:14,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 138 Invalid, 2551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2480 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:29:14,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-31 21:29:14,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-01-31 21:29:14,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 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 21:29:14,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2022-01-31 21:29:14,544 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 77 [2022-01-31 21:29:14,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:14,544 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2022-01-31 21:29:14,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:14,544 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2022-01-31 21:29:14,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:29:14,544 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:14,544 INFO L514 BasicCegarLoop]: trace histogram [34, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:14,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:29:14,544 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:14,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:14,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1444197219, now seen corresponding path program 32 times [2022-01-31 21:29:14,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:14,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914557296] [2022-01-31 21:29:14,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:14,593 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:14,613 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:14,613 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:14,633 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:14,682 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:14,683 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:14,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:14,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:14,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:14,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:14,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:15,507 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:15,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914557296] [2022-01-31 21:29:15,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [914557296] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:15,507 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:15,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:29:15,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182936782] [2022-01-31 21:29:15,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:15,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:29:15,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:15,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:29:15,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1649, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:29:15,508 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 21:29:16,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:16,978 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2022-01-31 21:29:16,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:29:16,978 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 21:29:16,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:16,978 INFO L225 Difference]: With dead ends: 90 [2022-01-31 21:29:16,978 INFO L226 Difference]: Without dead ends: 83 [2022-01-31 21:29:16,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=400, Invalid=5606, Unknown=0, NotChecked=0, Total=6006 [2022-01-31 21:29:16,980 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 75 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2665 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 2738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:16,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 188 Invalid, 2738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2665 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:29:16,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-01-31 21:29:16,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-01-31 21:29:16,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 78 states have internal predecessors, (82), 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 21:29:16,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2022-01-31 21:29:16,985 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 79 [2022-01-31 21:29:16,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:16,985 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2022-01-31 21:29:16,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 21:29:16,985 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2022-01-31 21:29:16,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-01-31 21:29:16,985 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:16,985 INFO L514 BasicCegarLoop]: trace histogram [35, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:16,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:29:16,986 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:16,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:16,986 INFO L85 PathProgramCache]: Analyzing trace with hash -362657992, now seen corresponding path program 33 times [2022-01-31 21:29:16,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:16,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355266978] [2022-01-31 21:29:16,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:17,038 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:17,058 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:17,058 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:17,081 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:17,127 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:17,127 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:17,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:17,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:17,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:17,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:17,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:17,941 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:17,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355266978] [2022-01-31 21:29:17,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1355266978] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:17,942 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:17,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:29:17,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884344202] [2022-01-31 21:29:17,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:17,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:29:17,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:17,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:29:17,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1731, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:29:17,943 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:19,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:19,433 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2022-01-31 21:29:19,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:29:19,433 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 2 states have call successors, (3), 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 81 [2022-01-31 21:29:19,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:19,433 INFO L225 Difference]: With dead ends: 92 [2022-01-31 21:29:19,434 INFO L226 Difference]: Without dead ends: 85 [2022-01-31 21:29:19,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=411, Invalid=5909, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 21:29:19,435 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 77 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 2699 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 2774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 2699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:19,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 113 Invalid, 2774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 2699 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:29:19,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-01-31 21:29:19,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-01-31 21:29:19,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.05) internal successors, (84), 80 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 21:29:19,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2022-01-31 21:29:19,440 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 81 [2022-01-31 21:29:19,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:19,440 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2022-01-31 21:29:19,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:19,440 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2022-01-31 21:29:19,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-01-31 21:29:19,440 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:19,440 INFO L514 BasicCegarLoop]: trace histogram [36, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:19,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:29:19,441 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:19,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:19,441 INFO L85 PathProgramCache]: Analyzing trace with hash -385546477, now seen corresponding path program 34 times [2022-01-31 21:29:19,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:19,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516316734] [2022-01-31 21:29:19,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:19,475 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:19,495 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:19,496 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:19,517 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:19,569 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:19,570 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:19,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:19,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:19,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:19,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:19,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:20,437 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:20,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516316734] [2022-01-31 21:29:20,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [516316734] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:20,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:20,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:29:20,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748078259] [2022-01-31 21:29:20,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:20,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:29:20,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:20,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:29:20,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1815, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:29:20,438 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:22,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:22,022 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-01-31 21:29:22,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:29:22,022 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2022-01-31 21:29:22,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:22,023 INFO L225 Difference]: With dead ends: 94 [2022-01-31 21:29:22,023 INFO L226 Difference]: Without dead ends: 87 [2022-01-31 21:29:22,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=422, Invalid=6220, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:29:22,024 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 79 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2712 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 2789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:22,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 83 Invalid, 2789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2712 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:29:22,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-01-31 21:29:22,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-01-31 21:29:22,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.048780487804878) internal successors, (86), 82 states have internal predecessors, (86), 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 21:29:22,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2022-01-31 21:29:22,035 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 83 [2022-01-31 21:29:22,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:22,035 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2022-01-31 21:29:22,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:22,035 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2022-01-31 21:29:22,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:29:22,036 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:22,036 INFO L514 BasicCegarLoop]: trace histogram [37, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:22,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:29:22,036 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:22,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:22,036 INFO L85 PathProgramCache]: Analyzing trace with hash -906544082, now seen corresponding path program 35 times [2022-01-31 21:29:22,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:22,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62938260] [2022-01-31 21:29:22,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:22,086 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:22,109 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:22,109 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:22,124 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:22,159 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:22,159 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:22,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:22,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:22,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:22,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:22,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:23,069 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:23,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62938260] [2022-01-31 21:29:23,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [62938260] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:23,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:23,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:29:23,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103503711] [2022-01-31 21:29:23,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:23,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:29:23,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:23,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:29:23,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1901, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:29:23,070 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 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 21:29:24,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:24,676 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-01-31 21:29:24,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:29:24,677 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 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 21:29:24,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:24,677 INFO L225 Difference]: With dead ends: 96 [2022-01-31 21:29:24,677 INFO L226 Difference]: Without dead ends: 89 [2022-01-31 21:29:24,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=433, Invalid=6539, Unknown=0, NotChecked=0, Total=6972 [2022-01-31 21:29:24,678 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 81 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 2890 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 2890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:24,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 98 Invalid, 2969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 2890 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:29:24,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-01-31 21:29:24,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-01-31 21:29:24,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 84 states have internal predecessors, (88), 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 21:29:24,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2022-01-31 21:29:24,684 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 85 [2022-01-31 21:29:24,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:24,684 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2022-01-31 21:29:24,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 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 21:29:24,684 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2022-01-31 21:29:24,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-01-31 21:29:24,684 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:24,684 INFO L514 BasicCegarLoop]: trace histogram [38, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:24,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:29:24,684 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:24,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:24,685 INFO L85 PathProgramCache]: Analyzing trace with hash 925931145, now seen corresponding path program 36 times [2022-01-31 21:29:24,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:24,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202367390] [2022-01-31 21:29:24,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:24,726 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:24,747 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:24,747 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:24,762 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:24,813 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:24,813 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:24,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:24,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:24,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:24,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:24,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:25,749 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:25,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202367390] [2022-01-31 21:29:25,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [202367390] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:25,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:25,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:29:25,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690698687] [2022-01-31 21:29:25,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:25,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:29:25,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:25,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:29:25,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1989, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:29:25,751 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:27,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:27,458 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2022-01-31 21:29:27,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:29:27,458 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 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 87 [2022-01-31 21:29:27,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:27,459 INFO L225 Difference]: With dead ends: 98 [2022-01-31 21:29:27,459 INFO L226 Difference]: Without dead ends: 91 [2022-01-31 21:29:27,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2022-01-31 21:29:27,460 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 83 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 3019 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 3019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:27,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 58 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 3019 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:29:27,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-01-31 21:29:27,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-01-31 21:29:27,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 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 21:29:27,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2022-01-31 21:29:27,466 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 87 [2022-01-31 21:29:27,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:27,466 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2022-01-31 21:29:27,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:27,466 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2022-01-31 21:29:27,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:29:27,466 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:27,467 INFO L514 BasicCegarLoop]: trace histogram [39, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:27,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:29:27,467 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:27,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:27,468 INFO L85 PathProgramCache]: Analyzing trace with hash 998032932, now seen corresponding path program 37 times [2022-01-31 21:29:27,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:27,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [234760786] [2022-01-31 21:29:27,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:27,500 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:27,516 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:27,516 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:27,537 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:27,567 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:27,567 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:27,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:27,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:27,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:27,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:27,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:28,522 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:28,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [234760786] [2022-01-31 21:29:28,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [234760786] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:28,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:28,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:29:28,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256702406] [2022-01-31 21:29:28,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:28,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:29:28,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:28,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:29:28,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:29:28,524 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:30,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:30,333 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2022-01-31 21:29:30,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:29:30,334 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-01-31 21:29:30,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:30,334 INFO L225 Difference]: With dead ends: 100 [2022-01-31 21:29:30,334 INFO L226 Difference]: Without dead ends: 93 [2022-01-31 21:29:30,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1133 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=455, Invalid=7201, Unknown=0, NotChecked=0, Total=7656 [2022-01-31 21:29:30,335 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 85 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 3339 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:30,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 133 Invalid, 3422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3339 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:29:30,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-01-31 21:29:30,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-01-31 21:29:30,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0454545454545454) internal successors, (92), 88 states have internal predecessors, (92), 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 21:29:30,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2022-01-31 21:29:30,340 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 89 [2022-01-31 21:29:30,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:30,341 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2022-01-31 21:29:30,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:30,341 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2022-01-31 21:29:30,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-01-31 21:29:30,341 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:30,341 INFO L514 BasicCegarLoop]: trace histogram [40, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:30,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:29:30,341 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:30,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:30,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1568373503, now seen corresponding path program 38 times [2022-01-31 21:29:30,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:30,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650001652] [2022-01-31 21:29:30,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:30,373 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:30,393 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:30,393 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:30,413 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:30,454 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:30,454 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:30,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:30,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:30,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:30,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:30,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:31,437 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:31,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650001652] [2022-01-31 21:29:31,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [650001652] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:31,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:31,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:29:31,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363919635] [2022-01-31 21:29:31,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:31,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:29:31,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:31,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:29:31,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2171, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:29:31,438 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 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 21:29:33,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:33,330 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2022-01-31 21:29:33,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:29:33,331 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 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 21:29:33,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:33,331 INFO L225 Difference]: With dead ends: 102 [2022-01-31 21:29:33,331 INFO L226 Difference]: Without dead ends: 95 [2022-01-31 21:29:33,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=466, Invalid=7544, Unknown=0, NotChecked=0, Total=8010 [2022-01-31 21:29:33,332 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 87 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 3448 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 3533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:33,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 143 Invalid, 3533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3448 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:29:33,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-01-31 21:29:33,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-01-31 21:29:33,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 90 states have internal predecessors, (94), 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 21:29:33,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2022-01-31 21:29:33,338 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 91 [2022-01-31 21:29:33,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:33,339 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2022-01-31 21:29:33,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 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 21:29:33,339 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2022-01-31 21:29:33,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-01-31 21:29:33,339 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:33,339 INFO L514 BasicCegarLoop]: trace histogram [41, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:33,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:29:33,339 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:33,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:33,339 INFO L85 PathProgramCache]: Analyzing trace with hash -90151654, now seen corresponding path program 39 times [2022-01-31 21:29:33,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:33,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942446572] [2022-01-31 21:29:33,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:33,382 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:33,398 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:33,398 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:33,413 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:33,465 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:33,465 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:33,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:33,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:33,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:33,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:34,470 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:34,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942446572] [2022-01-31 21:29:34,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [942446572] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:34,470 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:34,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:29:34,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427431954] [2022-01-31 21:29:34,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:34,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:29:34,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:34,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:29:34,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2265, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:29:34,472 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:36,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:36,446 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2022-01-31 21:29:36,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:29:36,447 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 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 93 [2022-01-31 21:29:36,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:36,447 INFO L225 Difference]: With dead ends: 104 [2022-01-31 21:29:36,447 INFO L226 Difference]: Without dead ends: 97 [2022-01-31 21:29:36,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=477, Invalid=7895, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:29:36,448 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 89 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 3672 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 3759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:36,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 138 Invalid, 3759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3672 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:29:36,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-01-31 21:29:36,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-01-31 21:29:36,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0434782608695652) internal successors, (96), 92 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 21:29:36,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2022-01-31 21:29:36,454 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 93 [2022-01-31 21:29:36,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:36,454 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2022-01-31 21:29:36,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:36,454 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2022-01-31 21:29:36,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-01-31 21:29:36,455 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:36,455 INFO L514 BasicCegarLoop]: trace histogram [42, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:36,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:29:36,455 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:36,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:36,455 INFO L85 PathProgramCache]: Analyzing trace with hash -499960715, now seen corresponding path program 40 times [2022-01-31 21:29:36,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:36,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343311379] [2022-01-31 21:29:36,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:36,487 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:36,507 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:36,507 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:36,522 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:36,563 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:36,563 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:36,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:36,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:36,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:36,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:36,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:37,624 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:37,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343311379] [2022-01-31 21:29:37,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [343311379] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:37,624 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:37,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:29:37,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070941175] [2022-01-31 21:29:37,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:37,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:29:37,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:37,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:29:37,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2361, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:29:37,625 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:39,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:39,643 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2022-01-31 21:29:39,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:29:39,643 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-01-31 21:29:39,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:39,644 INFO L225 Difference]: With dead ends: 106 [2022-01-31 21:29:39,644 INFO L226 Difference]: Without dead ends: 99 [2022-01-31 21:29:39,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=488, Invalid=8254, Unknown=0, NotChecked=0, Total=8742 [2022-01-31 21:29:39,645 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 91 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3642 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 3731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 3642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:39,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 83 Invalid, 3731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 3642 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:29:39,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-01-31 21:29:39,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-01-31 21:29:39,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 states have internal predecessors, (98), 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 21:29:39,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2022-01-31 21:29:39,656 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 95 [2022-01-31 21:29:39,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:39,656 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2022-01-31 21:29:39,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:39,656 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2022-01-31 21:29:39,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-01-31 21:29:39,657 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:39,657 INFO L514 BasicCegarLoop]: trace histogram [43, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:39,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:29:39,657 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:39,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:39,657 INFO L85 PathProgramCache]: Analyzing trace with hash 810522896, now seen corresponding path program 41 times [2022-01-31 21:29:39,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:39,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490026128] [2022-01-31 21:29:39,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:39,703 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:39,718 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:39,718 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:39,740 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:39,781 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:39,781 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:39,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:39,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:39,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:39,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:39,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:40,870 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:40,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490026128] [2022-01-31 21:29:40,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1490026128] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:40,870 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:40,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:29:40,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397903729] [2022-01-31 21:29:40,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:40,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:29:40,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:40,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:29:40,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2459, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:29:40,871 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 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 21:29:43,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:43,040 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2022-01-31 21:29:43,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:29:43,041 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 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 21:29:43,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:43,041 INFO L225 Difference]: With dead ends: 108 [2022-01-31 21:29:43,041 INFO L226 Difference]: Without dead ends: 101 [2022-01-31 21:29:43,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1335 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=499, Invalid=8621, Unknown=0, NotChecked=0, Total=9120 [2022-01-31 21:29:43,043 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 93 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 4153 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 4244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 4153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:43,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 203 Invalid, 4244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 4153 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:29:43,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-01-31 21:29:43,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-01-31 21:29:43,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.0416666666666667) internal successors, (100), 96 states have internal predecessors, (100), 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 21:29:43,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2022-01-31 21:29:43,049 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 97 [2022-01-31 21:29:43,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:43,049 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2022-01-31 21:29:43,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 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 21:29:43,049 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2022-01-31 21:29:43,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-01-31 21:29:43,049 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:43,049 INFO L514 BasicCegarLoop]: trace histogram [44, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:43,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:29:43,050 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:43,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:43,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1759855339, now seen corresponding path program 42 times [2022-01-31 21:29:43,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:43,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296178247] [2022-01-31 21:29:43,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:43,084 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,098 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,099 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:43,118 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,158 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,159 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:43,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:43,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:43,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:43,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:43,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:44,281 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:44,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296178247] [2022-01-31 21:29:44,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [296178247] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:44,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:44,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:29:44,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052321286] [2022-01-31 21:29:44,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:44,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:29:44,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:44,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:29:44,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2559, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:29:44,283 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:46,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:46,466 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2022-01-31 21:29:46,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:29:46,467 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 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 99 [2022-01-31 21:29:46,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:46,467 INFO L225 Difference]: With dead ends: 110 [2022-01-31 21:29:46,467 INFO L226 Difference]: Without dead ends: 103 [2022-01-31 21:29:46,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1388 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=510, Invalid=8996, Unknown=0, NotChecked=0, Total=9506 [2022-01-31 21:29:46,468 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 95 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 3976 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 4069 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 3976 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:46,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 43 Invalid, 4069 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 3976 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:29:46,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-01-31 21:29:46,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-01-31 21:29:46,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 98 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 21:29:46,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2022-01-31 21:29:46,474 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 99 [2022-01-31 21:29:46,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:46,474 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2022-01-31 21:29:46,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:46,475 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2022-01-31 21:29:46,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-01-31 21:29:46,475 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:46,475 INFO L514 BasicCegarLoop]: trace histogram [45, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:46,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:29:46,475 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:46,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:46,475 INFO L85 PathProgramCache]: Analyzing trace with hash -759700986, now seen corresponding path program 43 times [2022-01-31 21:29:46,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:46,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085775044] [2022-01-31 21:29:46,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:46,521 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:46,535 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:46,536 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:46,550 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:46,595 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:46,596 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:46,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:46,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:46,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:46,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:46,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:47,767 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:47,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085775044] [2022-01-31 21:29:47,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1085775044] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:47,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:47,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:29:47,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875501281] [2022-01-31 21:29:47,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:47,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:29:47,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:47,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:29:47,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2661, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:29:47,769 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:50,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:50,092 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2022-01-31 21:29:50,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-01-31 21:29:50,092 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2022-01-31 21:29:50,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:50,093 INFO L225 Difference]: With dead ends: 112 [2022-01-31 21:29:50,093 INFO L226 Difference]: Without dead ends: 105 [2022-01-31 21:29:50,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1442 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=521, Invalid=9379, Unknown=0, NotChecked=0, Total=9900 [2022-01-31 21:29:50,094 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 97 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 4375 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 4470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:50,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 143 Invalid, 4470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4375 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:29:50,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-01-31 21:29:50,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-01-31 21:29:50,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.04) internal successors, (104), 100 states have internal predecessors, (104), 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 21:29:50,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2022-01-31 21:29:50,100 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 101 [2022-01-31 21:29:50,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:50,100 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2022-01-31 21:29:50,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:50,100 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2022-01-31 21:29:50,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-01-31 21:29:50,101 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:50,101 INFO L514 BasicCegarLoop]: trace histogram [46, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:50,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:29:50,101 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:50,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:50,101 INFO L85 PathProgramCache]: Analyzing trace with hash 308225633, now seen corresponding path program 44 times [2022-01-31 21:29:50,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:50,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62943680] [2022-01-31 21:29:50,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:50,136 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:50,155 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:50,155 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:50,170 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:50,203 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:50,204 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:50,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:50,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:50,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:50,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:50,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:51,408 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:51,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62943680] [2022-01-31 21:29:51,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [62943680] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:51,409 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:51,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:29:51,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84874695] [2022-01-31 21:29:51,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:51,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:29:51,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:51,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:29:51,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2765, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:29:51,410 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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 21:29:53,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:53,742 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2022-01-31 21:29:53,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-01-31 21:29:53,742 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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 21:29:53,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:53,743 INFO L225 Difference]: With dead ends: 114 [2022-01-31 21:29:53,743 INFO L226 Difference]: Without dead ends: 107 [2022-01-31 21:29:53,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1497 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=532, Invalid=9770, Unknown=0, NotChecked=0, Total=10302 [2022-01-31 21:29:53,744 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 99 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 4254 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 4351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 4254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:53,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 43 Invalid, 4351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 4254 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:29:53,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-01-31 21:29:53,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-01-31 21:29:53,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0392156862745099) internal successors, (106), 102 states have internal predecessors, (106), 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 21:29:53,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2022-01-31 21:29:53,750 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 103 [2022-01-31 21:29:53,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:53,751 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2022-01-31 21:29:53,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 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 21:29:53,751 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2022-01-31 21:29:53,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-01-31 21:29:53,751 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:53,751 INFO L514 BasicCegarLoop]: trace histogram [47, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:53,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:29:53,751 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:53,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:53,752 INFO L85 PathProgramCache]: Analyzing trace with hash 88522748, now seen corresponding path program 45 times [2022-01-31 21:29:53,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:53,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456963954] [2022-01-31 21:29:53,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:53,792 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:53,813 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:53,814 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:53,833 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:53,864 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:53,864 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:53,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:53,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:53,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:53,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:55,132 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:55,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456963954] [2022-01-31 21:29:55,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1456963954] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:55,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:55,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-01-31 21:29:55,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445105566] [2022-01-31 21:29:55,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:55,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-01-31 21:29:55,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:55,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-01-31 21:29:55,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:29:55,133 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:57,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:57,646 INFO L93 Difference]: Finished difference Result 116 states and 121 transitions. [2022-01-31 21:29:57,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-01-31 21:29:57,647 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 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 105 [2022-01-31 21:29:57,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:57,647 INFO L225 Difference]: With dead ends: 116 [2022-01-31 21:29:57,647 INFO L226 Difference]: Without dead ends: 109 [2022-01-31 21:29:57,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1553 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=543, Invalid=10169, Unknown=0, NotChecked=0, Total=10712 [2022-01-31 21:29:57,648 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 101 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 4712 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 4811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 4712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:57,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 128 Invalid, 4811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 4712 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:29:57,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-01-31 21:29:57,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-01-31 21:29:57,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0384615384615385) internal successors, (108), 104 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 21:29:57,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2022-01-31 21:29:57,655 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 105 [2022-01-31 21:29:57,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:57,655 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2022-01-31 21:29:57,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:57,655 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2022-01-31 21:29:57,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-01-31 21:29:57,655 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:57,655 INFO L514 BasicCegarLoop]: trace histogram [48, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:57,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:29:57,656 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:57,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:57,656 INFO L85 PathProgramCache]: Analyzing trace with hash -592552233, now seen corresponding path program 46 times [2022-01-31 21:29:57,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:57,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042946704] [2022-01-31 21:29:57,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:57,697 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:57,712 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:57,712 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:57,731 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:57,760 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:57,760 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:57,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:57,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:57,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:57,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:57,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:59,054 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:59,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042946704] [2022-01-31 21:29:59,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1042946704] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:59,055 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:59,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-01-31 21:29:59,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386271686] [2022-01-31 21:29:59,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:59,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-01-31 21:29:59,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:59,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-01-31 21:29:59,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2979, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:29:59,056 INFO L87 Difference]: Start difference. First operand 109 states and 112 transitions. Second operand has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:01,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:01,624 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2022-01-31 21:30:01,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:30:01,624 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2022-01-31 21:30:01,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:01,625 INFO L225 Difference]: With dead ends: 118 [2022-01-31 21:30:01,625 INFO L226 Difference]: Without dead ends: 111 [2022-01-31 21:30:01,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1610 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=554, Invalid=10576, Unknown=0, NotChecked=0, Total=11130 [2022-01-31 21:30:01,626 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 103 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 4760 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 4861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 4760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:01,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 63 Invalid, 4861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 4760 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-01-31 21:30:01,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-01-31 21:30:01,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-01-31 21:30:01,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 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 21:30:01,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2022-01-31 21:30:01,632 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 107 [2022-01-31 21:30:01,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:01,633 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2022-01-31 21:30:01,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:01,633 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2022-01-31 21:30:01,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-01-31 21:30:01,633 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:01,633 INFO L514 BasicCegarLoop]: trace histogram [49, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:01,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:30:01,633 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:01,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:01,634 INFO L85 PathProgramCache]: Analyzing trace with hash 2024387314, now seen corresponding path program 47 times [2022-01-31 21:30:01,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:01,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998602840] [2022-01-31 21:30:01,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:01,677 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:01,692 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:01,692 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:01,713 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:01,744 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:01,745 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:01,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:01,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:01,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:01,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:01,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:03,097 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:03,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998602840] [2022-01-31 21:30:03,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1998602840] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:03,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:03,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:30:03,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558731231] [2022-01-31 21:30:03,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:03,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:30:03,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:03,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:30:03,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=3089, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:30:03,099 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 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 21:30:05,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:05,952 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2022-01-31 21:30:05,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:30:05,953 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 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 21:30:05,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:05,953 INFO L225 Difference]: With dead ends: 120 [2022-01-31 21:30:05,953 INFO L226 Difference]: Without dead ends: 113 [2022-01-31 21:30:05,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1668 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=565, Invalid=10991, Unknown=0, NotChecked=0, Total=11556 [2022-01-31 21:30:05,954 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 105 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 5096 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 5199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 5096 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:05,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 168 Invalid, 5199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 5096 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:30:05,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-01-31 21:30:05,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-01-31 21:30:05,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.037037037037037) internal successors, (112), 108 states have internal predecessors, (112), 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 21:30:05,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2022-01-31 21:30:05,961 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 109 [2022-01-31 21:30:05,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:05,961 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2022-01-31 21:30:05,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 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 21:30:05,961 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2022-01-31 21:30:05,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-01-31 21:30:05,962 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:05,962 INFO L514 BasicCegarLoop]: trace histogram [50, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:05,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:30:05,962 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:05,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:05,962 INFO L85 PathProgramCache]: Analyzing trace with hash 52456525, now seen corresponding path program 48 times [2022-01-31 21:30:05,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:05,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517904087] [2022-01-31 21:30:05,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:05,994 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:06,017 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:06,017 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:06,040 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:06,086 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:06,086 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:06,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:06,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:06,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:06,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:06,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:07,605 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:07,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517904087] [2022-01-31 21:30:07,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1517904087] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:07,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:07,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-01-31 21:30:07,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444972088] [2022-01-31 21:30:07,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:07,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-01-31 21:30:07,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:07,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-01-31 21:30:07,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=3201, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:30:07,606 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:10,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:10,720 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2022-01-31 21:30:10,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-01-31 21:30:10,720 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 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 111 [2022-01-31 21:30:10,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:10,720 INFO L225 Difference]: With dead ends: 122 [2022-01-31 21:30:10,721 INFO L226 Difference]: Without dead ends: 115 [2022-01-31 21:30:10,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=576, Invalid=11414, Unknown=0, NotChecked=0, Total=11990 [2022-01-31 21:30:10,722 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 107 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 5095 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 5200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 5095 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:10,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 78 Invalid, 5200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 5095 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:30:10,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-01-31 21:30:10,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-01-31 21:30:10,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0363636363636364) internal successors, (114), 110 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 21:30:10,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 118 transitions. [2022-01-31 21:30:10,736 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 118 transitions. Word has length 111 [2022-01-31 21:30:10,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:10,737 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 118 transitions. [2022-01-31 21:30:10,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:10,737 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 118 transitions. [2022-01-31 21:30:10,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-01-31 21:30:10,738 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:10,738 INFO L514 BasicCegarLoop]: trace histogram [51, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:10,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:30:10,738 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:10,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:10,738 INFO L85 PathProgramCache]: Analyzing trace with hash -892454168, now seen corresponding path program 49 times [2022-01-31 21:30:10,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:10,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899348862] [2022-01-31 21:30:10,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:10,773 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:10,794 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:10,794 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:10,816 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:10,860 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:10,860 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:10,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:10,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:10,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:10,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:10,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:12,463 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:12,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899348862] [2022-01-31 21:30:12,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1899348862] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:12,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:12,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-01-31 21:30:12,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970451966] [2022-01-31 21:30:12,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:12,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-01-31 21:30:12,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:12,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-01-31 21:30:12,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=3315, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:30:12,465 INFO L87 Difference]: Start difference. First operand 115 states and 118 transitions. Second operand has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:15,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:15,538 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2022-01-31 21:30:15,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-01-31 21:30:15,538 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2022-01-31 21:30:15,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:15,539 INFO L225 Difference]: With dead ends: 124 [2022-01-31 21:30:15,539 INFO L226 Difference]: Without dead ends: 117 [2022-01-31 21:30:15,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1787 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=587, Invalid=11845, Unknown=0, NotChecked=0, Total=12432 [2022-01-31 21:30:15,540 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 109 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 5692 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 5799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 5692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:15,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 258 Invalid, 5799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 5692 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:30:15,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-01-31 21:30:15,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2022-01-31 21:30:15,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0357142857142858) internal successors, (116), 112 states have internal predecessors, (116), 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 21:30:15,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 120 transitions. [2022-01-31 21:30:15,547 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 120 transitions. Word has length 113 [2022-01-31 21:30:15,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:15,547 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 120 transitions. [2022-01-31 21:30:15,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:15,547 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 120 transitions. [2022-01-31 21:30:15,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-01-31 21:30:15,548 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:15,548 INFO L514 BasicCegarLoop]: trace histogram [52, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:15,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:30:15,548 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:15,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:15,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1581436611, now seen corresponding path program 50 times [2022-01-31 21:30:15,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:15,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652047760] [2022-01-31 21:30:15,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:15,582 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:15,602 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:15,602 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:15,622 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:15,664 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:15,664 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:15,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:15,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:15,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:15,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:15,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:17,104 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:17,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652047760] [2022-01-31 21:30:17,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1652047760] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:17,104 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:17,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-01-31 21:30:17,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30665647] [2022-01-31 21:30:17,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:17,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-01-31 21:30:17,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:17,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-01-31 21:30:17,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=3431, Unknown=0, NotChecked=0, Total=3660 [2022-01-31 21:30:17,105 INFO L87 Difference]: Start difference. First operand 117 states and 120 transitions. Second operand has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 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 21:30:20,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:20,088 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2022-01-31 21:30:20,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-01-31 21:30:20,089 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 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 21:30:20,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:20,089 INFO L225 Difference]: With dead ends: 126 [2022-01-31 21:30:20,089 INFO L226 Difference]: Without dead ends: 119 [2022-01-31 21:30:20,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1848 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=598, Invalid=12284, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:30:20,090 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 111 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 5663 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 5772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 5663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:20,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 108 Invalid, 5772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 5663 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-01-31 21:30:20,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-01-31 21:30:20,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2022-01-31 21:30:20,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0350877192982457) internal successors, (118), 114 states have internal predecessors, (118), 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 21:30:20,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 122 transitions. [2022-01-31 21:30:20,098 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 122 transitions. Word has length 115 [2022-01-31 21:30:20,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:20,098 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 122 transitions. [2022-01-31 21:30:20,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 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 21:30:20,098 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 122 transitions. [2022-01-31 21:30:20,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-01-31 21:30:20,098 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:20,098 INFO L514 BasicCegarLoop]: trace histogram [53, 51, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:20,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:30:20,099 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:20,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:20,099 INFO L85 PathProgramCache]: Analyzing trace with hash -421406754, now seen corresponding path program 51 times [2022-01-31 21:30:20,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:20,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576675528] [2022-01-31 21:30:20,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:20,139 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:20,155 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:20,155 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:20,171 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:20,214 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:20,215 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:20,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:20,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:20,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:20,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:21,713 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:21,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576675528] [2022-01-31 21:30:21,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1576675528] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:21,714 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:21,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-01-31 21:30:21,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669794732] [2022-01-31 21:30:21,714 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:21,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-01-31 21:30:21,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:21,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-01-31 21:30:21,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:30:21,715 INFO L87 Difference]: Start difference. First operand 119 states and 122 transitions. Second operand has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:24,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:24,828 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2022-01-31 21:30:24,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-01-31 21:30:24,829 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 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 117 [2022-01-31 21:30:24,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:24,829 INFO L225 Difference]: With dead ends: 128 [2022-01-31 21:30:24,829 INFO L226 Difference]: Without dead ends: 121 [2022-01-31 21:30:24,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=609, Invalid=12731, Unknown=0, NotChecked=0, Total=13340 [2022-01-31 21:30:24,832 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 113 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 5996 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 6107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 5996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:24,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 208 Invalid, 6107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 5996 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:30:24,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-01-31 21:30:24,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-01-31 21:30:24,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 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 21:30:24,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 124 transitions. [2022-01-31 21:30:24,839 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 124 transitions. Word has length 117 [2022-01-31 21:30:24,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:24,839 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 124 transitions. [2022-01-31 21:30:24,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:24,839 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 124 transitions. [2022-01-31 21:30:24,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-01-31 21:30:24,840 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:24,840 INFO L514 BasicCegarLoop]: trace histogram [54, 52, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:24,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-01-31 21:30:24,840 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:24,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:24,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1008531911, now seen corresponding path program 52 times [2022-01-31 21:30:24,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:24,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407292989] [2022-01-31 21:30:24,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:24,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:24,896 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:24,896 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:24,918 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:24,950 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:24,950 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:24,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:24,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:25,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:25,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:25,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:26,507 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:26,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407292989] [2022-01-31 21:30:26,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407292989] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:26,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:26,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-01-31 21:30:26,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93485813] [2022-01-31 21:30:26,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:26,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-01-31 21:30:26,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:26,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-01-31 21:30:26,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=3669, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:30:26,509 INFO L87 Difference]: Start difference. First operand 121 states and 124 transitions. Second operand has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:29,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:29,728 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2022-01-31 21:30:29,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-01-31 21:30:29,729 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2022-01-31 21:30:29,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:29,729 INFO L225 Difference]: With dead ends: 130 [2022-01-31 21:30:29,729 INFO L226 Difference]: Without dead ends: 123 [2022-01-31 21:30:29,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=620, Invalid=13186, Unknown=0, NotChecked=0, Total=13806 [2022-01-31 21:30:29,730 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 115 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 6045 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 6158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 6045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:29,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 88 Invalid, 6158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 6045 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:30:29,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-01-31 21:30:29,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2022-01-31 21:30:29,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0338983050847457) internal successors, (122), 118 states have internal predecessors, (122), 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 21:30:29,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 126 transitions. [2022-01-31 21:30:29,737 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 126 transitions. Word has length 119 [2022-01-31 21:30:29,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:29,738 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 126 transitions. [2022-01-31 21:30:29,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:29,738 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 126 transitions. [2022-01-31 21:30:29,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-01-31 21:30:29,738 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:29,738 INFO L514 BasicCegarLoop]: trace histogram [55, 53, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:29,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-01-31 21:30:29,738 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:29,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:29,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1699875284, now seen corresponding path program 53 times [2022-01-31 21:30:29,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:29,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794245593] [2022-01-31 21:30:29,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:29,795 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:29,813 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:29,814 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:29,828 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:29,867 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:29,867 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:29,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:29,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:29,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:29,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:29,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:31,462 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:31,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794245593] [2022-01-31 21:30:31,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1794245593] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:31,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:31,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-01-31 21:30:31,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202230361] [2022-01-31 21:30:31,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:31,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-01-31 21:30:31,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:31,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-01-31 21:30:31,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=3791, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:30:31,472 INFO L87 Difference]: Start difference. First operand 123 states and 126 transitions. Second operand has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 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 21:30:34,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:34,798 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2022-01-31 21:30:34,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-01-31 21:30:34,798 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 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 21:30:34,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:34,799 INFO L225 Difference]: With dead ends: 132 [2022-01-31 21:30:34,799 INFO L226 Difference]: Without dead ends: 125 [2022-01-31 21:30:34,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2037 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=631, Invalid=13649, Unknown=0, NotChecked=0, Total=14280 [2022-01-31 21:30:34,800 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 117 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 6393 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 6508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 6393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:34,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 193 Invalid, 6508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 6393 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-01-31 21:30:34,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-01-31 21:30:34,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2022-01-31 21:30:34,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.0333333333333334) internal successors, (124), 120 states have internal predecessors, (124), 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 21:30:34,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 128 transitions. [2022-01-31 21:30:34,807 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 128 transitions. Word has length 121 [2022-01-31 21:30:34,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:34,807 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 128 transitions. [2022-01-31 21:30:34,807 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 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 21:30:34,807 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 128 transitions. [2022-01-31 21:30:34,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-01-31 21:30:34,808 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:34,808 INFO L514 BasicCegarLoop]: trace histogram [56, 54, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:34,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-01-31 21:30:34,808 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:34,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:34,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1729008303, now seen corresponding path program 54 times [2022-01-31 21:30:34,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:34,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954608971] [2022-01-31 21:30:34,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:34,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:34,903 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:34,903 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:34,920 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:34,952 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:34,952 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:34,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:34,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:35,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:35,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:36,598 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:36,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954608971] [2022-01-31 21:30:36,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [954608971] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:36,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:36,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-01-31 21:30:36,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619775020] [2022-01-31 21:30:36,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:36,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-01-31 21:30:36,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:36,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-01-31 21:30:36,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3915, Unknown=0, NotChecked=0, Total=4160 [2022-01-31 21:30:36,600 INFO L87 Difference]: Start difference. First operand 125 states and 128 transitions. Second operand has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:40,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:40,134 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2022-01-31 21:30:40,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-01-31 21:30:40,135 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 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 123 [2022-01-31 21:30:40,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:40,135 INFO L225 Difference]: With dead ends: 134 [2022-01-31 21:30:40,135 INFO L226 Difference]: Without dead ends: 127 [2022-01-31 21:30:40,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2102 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=642, Invalid=14120, Unknown=0, NotChecked=0, Total=14762 [2022-01-31 21:30:40,136 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 119 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 6927 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 7044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 6927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:40,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 288 Invalid, 7044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 6927 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-01-31 21:30:40,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-01-31 21:30:40,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2022-01-31 21:30:40,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0327868852459017) internal successors, (126), 122 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 21:30:40,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2022-01-31 21:30:40,144 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 123 [2022-01-31 21:30:40,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:40,144 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2022-01-31 21:30:40,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:40,144 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2022-01-31 21:30:40,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-01-31 21:30:40,145 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:40,145 INFO L514 BasicCegarLoop]: trace histogram [57, 55, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:40,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-01-31 21:30:40,145 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:40,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:40,145 INFO L85 PathProgramCache]: Analyzing trace with hash -338931510, now seen corresponding path program 55 times [2022-01-31 21:30:40,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:40,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126602172] [2022-01-31 21:30:40,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:40,174 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:40,189 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:40,189 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:40,208 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:40,248 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:40,248 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:40,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:40,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:40,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:40,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:40,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:41,935 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:41,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126602172] [2022-01-31 21:30:41,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126602172] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:41,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:41,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-01-31 21:30:41,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669010191] [2022-01-31 21:30:41,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:41,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-01-31 21:30:41,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:41,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-01-31 21:30:41,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4041, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 21:30:41,937 INFO L87 Difference]: Start difference. First operand 127 states and 130 transitions. Second operand has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:45,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:45,565 INFO L93 Difference]: Finished difference Result 136 states and 141 transitions. [2022-01-31 21:30:45,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-01-31 21:30:45,565 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2022-01-31 21:30:45,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:45,566 INFO L225 Difference]: With dead ends: 136 [2022-01-31 21:30:45,566 INFO L226 Difference]: Without dead ends: 129 [2022-01-31 21:30:45,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2168 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=653, Invalid=14599, Unknown=0, NotChecked=0, Total=15252 [2022-01-31 21:30:45,567 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 121 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 6912 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 7031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 6912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:45,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 178 Invalid, 7031 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 6912 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-01-31 21:30:45,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-01-31 21:30:45,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2022-01-31 21:30:45,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.032258064516129) internal successors, (128), 124 states have internal predecessors, (128), 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 21:30:45,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 132 transitions. [2022-01-31 21:30:45,574 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 132 transitions. Word has length 125 [2022-01-31 21:30:45,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:45,574 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 132 transitions. [2022-01-31 21:30:45,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:45,574 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 132 transitions. [2022-01-31 21:30:45,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-01-31 21:30:45,575 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:45,575 INFO L514 BasicCegarLoop]: trace histogram [58, 56, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:45,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-01-31 21:30:45,575 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:45,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:45,575 INFO L85 PathProgramCache]: Analyzing trace with hash 940766245, now seen corresponding path program 56 times [2022-01-31 21:30:45,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:45,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341440613] [2022-01-31 21:30:45,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:45,606 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:45,626 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:45,627 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:45,642 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:45,682 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:45,683 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:45,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:45,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:45,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:45,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:45,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:47,433 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:47,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341440613] [2022-01-31 21:30:47,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1341440613] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:47,434 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:47,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-01-31 21:30:47,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078530080] [2022-01-31 21:30:47,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:47,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-01-31 21:30:47,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:47,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-01-31 21:30:47,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=4169, Unknown=0, NotChecked=0, Total=4422 [2022-01-31 21:30:47,435 INFO L87 Difference]: Start difference. First operand 129 states and 132 transitions. Second operand has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 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 21:30:51,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:51,127 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2022-01-31 21:30:51,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-01-31 21:30:51,128 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 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 21:30:51,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:51,128 INFO L225 Difference]: With dead ends: 138 [2022-01-31 21:30:51,128 INFO L226 Difference]: Without dead ends: 131 [2022-01-31 21:30:51,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2235 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=664, Invalid=15086, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 21:30:51,130 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 123 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 6967 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 7088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 6967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:51,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 98 Invalid, 7088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 6967 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-01-31 21:30:51,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-01-31 21:30:51,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-01-31 21:30:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 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 21:30:51,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 134 transitions. [2022-01-31 21:30:51,142 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 134 transitions. Word has length 127 [2022-01-31 21:30:51,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:51,142 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 134 transitions. [2022-01-31 21:30:51,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 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 21:30:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 134 transitions. [2022-01-31 21:30:51,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-01-31 21:30:51,142 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:51,142 INFO L514 BasicCegarLoop]: trace histogram [59, 57, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:51,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-01-31 21:30:51,143 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:51,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:51,143 INFO L85 PathProgramCache]: Analyzing trace with hash -1925305152, now seen corresponding path program 57 times [2022-01-31 21:30:51,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:51,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634813451] [2022-01-31 21:30:51,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:51,187 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,208 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,208 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:51,223 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,254 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:51,254 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:51,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:51,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:51,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:51,323 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 21:30:53,065 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:53,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634813451] [2022-01-31 21:30:53,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1634813451] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:53,065 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:53,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-01-31 21:30:53,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385373857] [2022-01-31 21:30:53,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:53,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-01-31 21:30:53,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:53,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-01-31 21:30:53,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=4299, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:30:53,066 INFO L87 Difference]: Start difference. First operand 131 states and 134 transitions. Second operand has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:56,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:56,875 INFO L93 Difference]: Finished difference Result 140 states and 145 transitions. [2022-01-31 21:30:56,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-01-31 21:30:56,875 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 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 129 [2022-01-31 21:30:56,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:56,876 INFO L225 Difference]: With dead ends: 140 [2022-01-31 21:30:56,876 INFO L226 Difference]: Without dead ends: 133 [2022-01-31 21:30:56,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2303 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=675, Invalid=15581, Unknown=0, NotChecked=0, Total=16256 [2022-01-31 21:30:56,877 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 125 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 7301 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 7424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 7301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:56,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 193 Invalid, 7424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 7301 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-01-31 21:30:56,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-01-31 21:30:56,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2022-01-31 21:30:56,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.03125) internal successors, (132), 128 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 21:30:56,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 136 transitions. [2022-01-31 21:30:56,885 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 136 transitions. Word has length 129 [2022-01-31 21:30:56,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:56,885 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 136 transitions. [2022-01-31 21:30:56,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:56,885 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 136 transitions. [2022-01-31 21:30:56,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-01-31 21:30:56,886 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:56,886 INFO L514 BasicCegarLoop]: trace histogram [60, 58, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:56,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-01-31 21:30:56,886 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:56,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:56,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1149086363, now seen corresponding path program 58 times [2022-01-31 21:30:56,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:56,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801546168] [2022-01-31 21:30:56,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:56,927 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,944 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,944 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:56,960 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,993 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:56,993 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:56,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:57,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:57,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:57,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:57,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:58,843 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:58,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801546168] [2022-01-31 21:30:58,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [801546168] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:58,844 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:58,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-01-31 21:30:58,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177456880] [2022-01-31 21:30:58,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:58,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-01-31 21:30:58,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:58,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-01-31 21:30:58,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=4431, Unknown=0, NotChecked=0, Total=4692 [2022-01-31 21:30:58,845 INFO L87 Difference]: Start difference. First operand 133 states and 136 transitions. Second operand has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:02,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:02,839 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2022-01-31 21:31:02,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-01-31 21:31:02,839 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2022-01-31 21:31:02,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:02,840 INFO L225 Difference]: With dead ends: 142 [2022-01-31 21:31:02,840 INFO L226 Difference]: Without dead ends: 135 [2022-01-31 21:31:02,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2372 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=686, Invalid=16084, Unknown=0, NotChecked=0, Total=16770 [2022-01-31 21:31:02,841 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 127 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 7802 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 7927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 7802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:02,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 313 Invalid, 7927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 7802 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-01-31 21:31:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-01-31 21:31:02,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2022-01-31 21:31:02,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.0307692307692307) internal successors, (134), 130 states have internal predecessors, (134), 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 21:31:02,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 138 transitions. [2022-01-31 21:31:02,849 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 138 transitions. Word has length 131 [2022-01-31 21:31:02,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:02,849 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 138 transitions. [2022-01-31 21:31:02,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:02,849 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 138 transitions. [2022-01-31 21:31:02,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-01-31 21:31:02,850 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:02,850 INFO L514 BasicCegarLoop]: trace histogram [61, 59, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:02,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-01-31 21:31:02,850 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:02,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:02,850 INFO L85 PathProgramCache]: Analyzing trace with hash 701832630, now seen corresponding path program 59 times [2022-01-31 21:31:02,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:02,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349157879] [2022-01-31 21:31:02,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:02,891 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,912 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,912 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,927 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,967 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:02,967 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:02,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:02,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:03,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:03,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:03,072 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 21:31:04,877 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:04,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349157879] [2022-01-31 21:31:04,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1349157879] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:04,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:04,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2022-01-31 21:31:04,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474227779] [2022-01-31 21:31:04,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:04,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-01-31 21:31:04,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:04,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-01-31 21:31:04,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:31:04,879 INFO L87 Difference]: Start difference. First operand 135 states and 138 transitions. Second operand has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 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 21:31:09,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:09,003 INFO L93 Difference]: Finished difference Result 144 states and 149 transitions. [2022-01-31 21:31:09,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-01-31 21:31:09,004 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 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 21:31:09,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:09,004 INFO L225 Difference]: With dead ends: 144 [2022-01-31 21:31:09,004 INFO L226 Difference]: Without dead ends: 137 [2022-01-31 21:31:09,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=697, Invalid=16595, Unknown=0, NotChecked=0, Total=17292 [2022-01-31 21:31:09,006 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 129 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 8058 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 8185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 8058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:09,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 268 Invalid, 8185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 8058 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-01-31 21:31:09,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-01-31 21:31:09,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2022-01-31 21:31:09,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0303030303030303) internal successors, (136), 132 states have internal predecessors, (136), 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 21:31:09,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 140 transitions. [2022-01-31 21:31:09,014 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 140 transitions. Word has length 133 [2022-01-31 21:31:09,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:09,014 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 140 transitions. [2022-01-31 21:31:09,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 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 21:31:09,014 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 140 transitions. [2022-01-31 21:31:09,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-01-31 21:31:09,014 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:09,015 INFO L514 BasicCegarLoop]: trace histogram [62, 60, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:09,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-01-31 21:31:09,015 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:09,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:09,015 INFO L85 PathProgramCache]: Analyzing trace with hash 387724817, now seen corresponding path program 60 times [2022-01-31 21:31:09,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:09,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308691009] [2022-01-31 21:31:09,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:09,050 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,072 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,072 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:09,086 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,126 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:09,126 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:09,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:09,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:09,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:09,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:09,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:11,122 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:11,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308691009] [2022-01-31 21:31:11,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1308691009] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:11,122 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:11,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-01-31 21:31:11,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563960979] [2022-01-31 21:31:11,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:11,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-01-31 21:31:11,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:11,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-01-31 21:31:11,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=4701, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:31:11,123 INFO L87 Difference]: Start difference. First operand 137 states and 140 transitions. Second operand has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:15,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:15,387 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2022-01-31 21:31:15,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-01-31 21:31:15,388 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 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 135 [2022-01-31 21:31:15,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:15,388 INFO L225 Difference]: With dead ends: 146 [2022-01-31 21:31:15,388 INFO L226 Difference]: Without dead ends: 139 [2022-01-31 21:31:15,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2513 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=708, Invalid=17114, Unknown=0, NotChecked=0, Total=17822 [2022-01-31 21:31:15,389 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 131 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 8360 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 8489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 8360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:15,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 293 Invalid, 8489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 8360 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-01-31 21:31:15,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-01-31 21:31:15,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-01-31 21:31:15,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0298507462686568) internal successors, (138), 134 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 21:31:15,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 142 transitions. [2022-01-31 21:31:15,397 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 142 transitions. Word has length 135 [2022-01-31 21:31:15,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:15,397 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 142 transitions. [2022-01-31 21:31:15,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:15,397 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 142 transitions. [2022-01-31 21:31:15,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:31:15,397 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:15,398 INFO L514 BasicCegarLoop]: trace histogram [63, 61, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:15,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-01-31 21:31:15,398 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:15,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:15,398 INFO L85 PathProgramCache]: Analyzing trace with hash -822172756, now seen corresponding path program 61 times [2022-01-31 21:31:15,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:15,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232158554] [2022-01-31 21:31:15,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:15,429 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:15,443 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:15,443 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:15,458 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:15,488 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:15,488 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:15,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:15,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:15,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:15,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:15,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:17,465 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:17,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232158554] [2022-01-31 21:31:17,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [232158554] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:17,465 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:17,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2022-01-31 21:31:17,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503447035] [2022-01-31 21:31:17,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:17,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-01-31 21:31:17,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:17,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-01-31 21:31:17,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=4839, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:31:17,466 INFO L87 Difference]: Start difference. First operand 139 states and 142 transitions. Second operand has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:21,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:21,980 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2022-01-31 21:31:21,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-01-31 21:31:21,981 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2022-01-31 21:31:21,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:21,981 INFO L225 Difference]: With dead ends: 148 [2022-01-31 21:31:21,981 INFO L226 Difference]: Without dead ends: 141 [2022-01-31 21:31:21,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2585 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=719, Invalid=17641, Unknown=0, NotChecked=0, Total=18360 [2022-01-31 21:31:21,982 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 133 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 8721 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 8852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 8721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:21,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 343 Invalid, 8852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 8721 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-01-31 21:31:21,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-01-31 21:31:21,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2022-01-31 21:31:21,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0294117647058822) internal successors, (140), 136 states have internal predecessors, (140), 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 21:31:21,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 144 transitions. [2022-01-31 21:31:21,991 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 144 transitions. Word has length 137 [2022-01-31 21:31:21,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:21,991 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 144 transitions. [2022-01-31 21:31:21,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:21,991 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 144 transitions. [2022-01-31 21:31:21,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-01-31 21:31:21,991 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:21,991 INFO L514 BasicCegarLoop]: trace histogram [64, 62, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:21,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-01-31 21:31:21,992 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:21,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:21,992 INFO L85 PathProgramCache]: Analyzing trace with hash 402396807, now seen corresponding path program 62 times [2022-01-31 21:31:21,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:21,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011954805] [2022-01-31 21:31:21,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:22,154 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:22,176 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:22,176 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:22,196 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:22,228 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:22,228 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:22,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:22,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:22,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:22,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:24,285 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:24,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011954805] [2022-01-31 21:31:24,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1011954805] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:24,285 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:24,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-01-31 21:31:24,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348630945] [2022-01-31 21:31:24,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:24,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-01-31 21:31:24,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:24,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-01-31 21:31:24,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=4979, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:31:24,286 INFO L87 Difference]: Start difference. First operand 141 states and 144 transitions. Second operand has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 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 21:31:28,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:28,660 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2022-01-31 21:31:28,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-01-31 21:31:28,660 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 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 21:31:28,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:28,661 INFO L225 Difference]: With dead ends: 150 [2022-01-31 21:31:28,661 INFO L226 Difference]: Without dead ends: 143 [2022-01-31 21:31:28,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2658 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=730, Invalid=18176, Unknown=0, NotChecked=0, Total=18906 [2022-01-31 21:31:28,662 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 135 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 8427 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 8560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 8427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:28,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 148 Invalid, 8560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 8427 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-01-31 21:31:28,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-01-31 21:31:28,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2022-01-31 21:31:28,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0289855072463767) internal successors, (142), 138 states have internal predecessors, (142), 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 21:31:28,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 146 transitions. [2022-01-31 21:31:28,670 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 146 transitions. Word has length 139 [2022-01-31 21:31:28,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:28,670 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 146 transitions. [2022-01-31 21:31:28,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 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 21:31:28,670 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 146 transitions. [2022-01-31 21:31:28,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-01-31 21:31:28,671 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:28,671 INFO L514 BasicCegarLoop]: trace histogram [65, 63, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:28,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-01-31 21:31:28,671 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:28,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:28,671 INFO L85 PathProgramCache]: Analyzing trace with hash 392707746, now seen corresponding path program 63 times [2022-01-31 21:31:28,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:28,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517320267] [2022-01-31 21:31:28,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:28,703 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,717 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,717 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:28,731 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,762 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:28,763 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:28,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:28,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:28,834 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:28,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:28,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:30,877 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:30,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517320267] [2022-01-31 21:31:30,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1517320267] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:30,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:30,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2022-01-31 21:31:30,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527569958] [2022-01-31 21:31:30,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:30,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-01-31 21:31:30,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:30,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-01-31 21:31:30,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=5121, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:31:30,879 INFO L87 Difference]: Start difference. First operand 143 states and 146 transitions. Second operand has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:35,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:35,431 INFO L93 Difference]: Finished difference Result 152 states and 157 transitions. [2022-01-31 21:31:35,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-01-31 21:31:35,432 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 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 141 [2022-01-31 21:31:35,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:35,435 INFO L225 Difference]: With dead ends: 152 [2022-01-31 21:31:35,435 INFO L226 Difference]: Without dead ends: 145 [2022-01-31 21:31:35,436 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=741, Invalid=18719, Unknown=0, NotChecked=0, Total=19460 [2022-01-31 21:31:35,437 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 137 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 8784 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 8919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 8784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:35,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 138 Invalid, 8919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 8784 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-01-31 21:31:35,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-01-31 21:31:35,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2022-01-31 21:31:35,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0285714285714285) internal successors, (144), 140 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 21:31:35,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 148 transitions. [2022-01-31 21:31:35,450 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 148 transitions. Word has length 141 [2022-01-31 21:31:35,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:35,450 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 148 transitions. [2022-01-31 21:31:35,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:35,450 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 148 transitions. [2022-01-31 21:31:35,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-01-31 21:31:35,451 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:35,451 INFO L514 BasicCegarLoop]: trace histogram [66, 64, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:35,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-01-31 21:31:35,451 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:35,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:35,451 INFO L85 PathProgramCache]: Analyzing trace with hash -328545283, now seen corresponding path program 64 times [2022-01-31 21:31:35,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:35,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584987495] [2022-01-31 21:31:35,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:35,495 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,511 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,511 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:35,531 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:35,578 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:35,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:35,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:35,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:35,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:37,692 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:37,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584987495] [2022-01-31 21:31:37,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1584987495] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:37,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:37,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2022-01-31 21:31:37,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135573319] [2022-01-31 21:31:37,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:37,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-01-31 21:31:37,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:37,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-01-31 21:31:37,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=5265, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:31:37,694 INFO L87 Difference]: Start difference. First operand 145 states and 148 transitions. Second operand has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:42,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:42,472 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2022-01-31 21:31:42,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-01-31 21:31:42,472 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2022-01-31 21:31:42,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:42,483 INFO L225 Difference]: With dead ends: 154 [2022-01-31 21:31:42,483 INFO L226 Difference]: Without dead ends: 147 [2022-01-31 21:31:42,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2807 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=752, Invalid=19270, Unknown=0, NotChecked=0, Total=20022 [2022-01-31 21:31:42,486 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 139 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 9476 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 9613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 9476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:42,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 333 Invalid, 9613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 9476 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-01-31 21:31:42,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-01-31 21:31:42,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-01-31 21:31:42,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.028169014084507) internal successors, (146), 142 states have internal predecessors, (146), 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 21:31:42,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 150 transitions. [2022-01-31 21:31:42,495 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 150 transitions. Word has length 143 [2022-01-31 21:31:42,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:42,495 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 150 transitions. [2022-01-31 21:31:42,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:42,495 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 150 transitions. [2022-01-31 21:31:42,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-01-31 21:31:42,496 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:42,496 INFO L514 BasicCegarLoop]: trace histogram [67, 65, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:42,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-01-31 21:31:42,496 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:42,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:42,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1962971496, now seen corresponding path program 65 times [2022-01-31 21:31:42,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:42,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792596893] [2022-01-31 21:31:42,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:42,537 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:42,557 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:42,557 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:42,576 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:42,618 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:42,618 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:42,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:42,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:42,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:42,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:44,807 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:44,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792596893] [2022-01-31 21:31:44,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1792596893] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:44,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:44,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-01-31 21:31:44,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674856628] [2022-01-31 21:31:44,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:44,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-01-31 21:31:44,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:44,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-01-31 21:31:44,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5411, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:31:44,808 INFO L87 Difference]: Start difference. First operand 147 states and 150 transitions. Second operand has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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 21:31:49,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:49,566 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2022-01-31 21:31:49,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-01-31 21:31:49,567 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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 21:31:49,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:49,567 INFO L225 Difference]: With dead ends: 156 [2022-01-31 21:31:49,567 INFO L226 Difference]: Without dead ends: 149 [2022-01-31 21:31:49,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2883 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=763, Invalid=19829, Unknown=0, NotChecked=0, Total=20592 [2022-01-31 21:31:49,568 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 141 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 9116 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 9255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 9116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:49,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 48 Invalid, 9255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 9116 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-01-31 21:31:49,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-01-31 21:31:49,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2022-01-31 21:31:49,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0277777777777777) internal successors, (148), 144 states have internal predecessors, (148), 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 21:31:49,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 152 transitions. [2022-01-31 21:31:49,585 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 152 transitions. Word has length 145 [2022-01-31 21:31:49,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:49,585 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 152 transitions. [2022-01-31 21:31:49,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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 21:31:49,585 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 152 transitions. [2022-01-31 21:31:49,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-01-31 21:31:49,586 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:49,586 INFO L514 BasicCegarLoop]: trace histogram [68, 66, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:49,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-01-31 21:31:49,586 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:49,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:49,586 INFO L85 PathProgramCache]: Analyzing trace with hash -688531853, now seen corresponding path program 66 times [2022-01-31 21:31:49,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:49,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668516619] [2022-01-31 21:31:49,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:49,626 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:49,641 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:49,641 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:49,662 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:49,701 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:49,702 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:49,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:49,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:49,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:49,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:49,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:51,969 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:51,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668516619] [2022-01-31 21:31:51,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1668516619] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:51,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:51,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2022-01-31 21:31:51,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747434178] [2022-01-31 21:31:51,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:51,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-01-31 21:31:51,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:51,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-01-31 21:31:51,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=5559, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:31:51,970 INFO L87 Difference]: Start difference. First operand 149 states and 152 transitions. Second operand has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:56,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:31:56,835 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2022-01-31 21:31:56,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-01-31 21:31:56,836 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 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 147 [2022-01-31 21:31:56,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:31:56,837 INFO L225 Difference]: With dead ends: 158 [2022-01-31 21:31:56,837 INFO L226 Difference]: Without dead ends: 151 [2022-01-31 21:31:56,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2960 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=774, Invalid=20396, Unknown=0, NotChecked=0, Total=21170 [2022-01-31 21:31:56,838 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 143 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 9281 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 9422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 9281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:31:56,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 58 Invalid, 9422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 9281 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-01-31 21:31:56,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-01-31 21:31:56,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2022-01-31 21:31:56,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0273972602739727) internal successors, (150), 146 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 21:31:56,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 154 transitions. [2022-01-31 21:31:56,847 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 154 transitions. Word has length 147 [2022-01-31 21:31:56,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:31:56,847 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 154 transitions. [2022-01-31 21:31:56,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:31:56,847 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 154 transitions. [2022-01-31 21:31:56,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-01-31 21:31:56,847 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:31:56,847 INFO L514 BasicCegarLoop]: trace histogram [69, 67, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:31:56,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-01-31 21:31:56,848 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:31:56,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:31:56,848 INFO L85 PathProgramCache]: Analyzing trace with hash -17714290, now seen corresponding path program 67 times [2022-01-31 21:31:56,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:31:56,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824325944] [2022-01-31 21:31:56,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:31:56,892 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:56,908 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:56,908 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:56,923 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:56,954 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:31:56,954 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:31:56,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:31:56,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:57,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:31:57,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:31:57,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:31:59,259 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:31:59,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824325944] [2022-01-31 21:31:59,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1824325944] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:31:59,260 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:31:59,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-01-31 21:31:59,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561966723] [2022-01-31 21:31:59,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:31:59,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-01-31 21:31:59,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:31:59,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-01-31 21:31:59,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=5709, Unknown=0, NotChecked=0, Total=6006 [2022-01-31 21:31:59,261 INFO L87 Difference]: Start difference. First operand 151 states and 154 transitions. Second operand has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:04,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:04,246 INFO L93 Difference]: Finished difference Result 160 states and 165 transitions. [2022-01-31 21:32:04,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-01-31 21:32:04,247 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2022-01-31 21:32:04,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:04,247 INFO L225 Difference]: With dead ends: 160 [2022-01-31 21:32:04,247 INFO L226 Difference]: Without dead ends: 153 [2022-01-31 21:32:04,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3038 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=785, Invalid=20971, Unknown=0, NotChecked=0, Total=21756 [2022-01-31 21:32:04,248 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 145 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 9565 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 9708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 9565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:04,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 63 Invalid, 9708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 9565 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-01-31 21:32:04,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-01-31 21:32:04,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2022-01-31 21:32:04,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.027027027027027) internal successors, (152), 148 states have internal predecessors, (152), 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 21:32:04,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 156 transitions. [2022-01-31 21:32:04,257 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 156 transitions. Word has length 149 [2022-01-31 21:32:04,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:04,257 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 156 transitions. [2022-01-31 21:32:04,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:04,257 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 156 transitions. [2022-01-31 21:32:04,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-01-31 21:32:04,258 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:04,258 INFO L514 BasicCegarLoop]: trace histogram [70, 68, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:04,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-01-31 21:32:04,258 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:04,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:04,258 INFO L85 PathProgramCache]: Analyzing trace with hash 392869353, now seen corresponding path program 68 times [2022-01-31 21:32:04,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:04,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883458047] [2022-01-31 21:32:04,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:04,300 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,321 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,321 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:04,341 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,381 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:04,382 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:04,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:04,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:04,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:04,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:06,818 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:06,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883458047] [2022-01-31 21:32:06,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1883458047] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:06,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:06,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2022-01-31 21:32:06,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036351583] [2022-01-31 21:32:06,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:06,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-01-31 21:32:06,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:06,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-01-31 21:32:06,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=5861, Unknown=0, NotChecked=0, Total=6162 [2022-01-31 21:32:06,820 INFO L87 Difference]: Start difference. First operand 153 states and 156 transitions. Second operand has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 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 21:32:12,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:12,062 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2022-01-31 21:32:12,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-01-31 21:32:12,062 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 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 21:32:12,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:12,071 INFO L225 Difference]: With dead ends: 162 [2022-01-31 21:32:12,071 INFO L226 Difference]: Without dead ends: 155 [2022-01-31 21:32:12,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3117 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=796, Invalid=21554, Unknown=0, NotChecked=0, Total=22350 [2022-01-31 21:32:12,072 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 147 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 10271 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 10416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 10271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:12,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 198 Invalid, 10416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 10271 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:32:12,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-01-31 21:32:12,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2022-01-31 21:32:12,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.0266666666666666) internal successors, (154), 150 states have internal predecessors, (154), 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 21:32:12,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 158 transitions. [2022-01-31 21:32:12,081 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 158 transitions. Word has length 151 [2022-01-31 21:32:12,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:12,081 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 158 transitions. [2022-01-31 21:32:12,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 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 21:32:12,082 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 158 transitions. [2022-01-31 21:32:12,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2022-01-31 21:32:12,082 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:12,082 INFO L514 BasicCegarLoop]: trace histogram [71, 69, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:12,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-01-31 21:32:12,083 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:12,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:12,083 INFO L85 PathProgramCache]: Analyzing trace with hash -173240956, now seen corresponding path program 69 times [2022-01-31 21:32:12,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:12,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869005302] [2022-01-31 21:32:12,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:12,111 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,131 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,131 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:12,185 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,236 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:12,236 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:12,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:12,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:12,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:12,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:14,697 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:14,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869005302] [2022-01-31 21:32:14,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [869005302] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:14,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:14,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2022-01-31 21:32:14,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641240208] [2022-01-31 21:32:14,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:14,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-01-31 21:32:14,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:14,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-01-31 21:32:14,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=6015, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 21:32:14,699 INFO L87 Difference]: Start difference. First operand 155 states and 158 transitions. Second operand has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:20,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:20,095 INFO L93 Difference]: Finished difference Result 164 states and 169 transitions. [2022-01-31 21:32:20,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-01-31 21:32:20,095 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 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 153 [2022-01-31 21:32:20,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:20,096 INFO L225 Difference]: With dead ends: 164 [2022-01-31 21:32:20,096 INFO L226 Difference]: Without dead ends: 157 [2022-01-31 21:32:20,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3197 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=807, Invalid=22145, Unknown=0, NotChecked=0, Total=22952 [2022-01-31 21:32:20,097 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 149 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 10477 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 10624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 10477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:20,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 163 Invalid, 10624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 10477 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:32:20,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-01-31 21:32:20,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2022-01-31 21:32:20,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.0263157894736843) internal successors, (156), 152 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 21:32:20,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 160 transitions. [2022-01-31 21:32:20,106 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 160 transitions. Word has length 153 [2022-01-31 21:32:20,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:20,106 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 160 transitions. [2022-01-31 21:32:20,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:20,106 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 160 transitions. [2022-01-31 21:32:20,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-01-31 21:32:20,106 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:20,107 INFO L514 BasicCegarLoop]: trace histogram [72, 70, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:20,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-01-31 21:32:20,107 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:20,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:20,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1255598687, now seen corresponding path program 70 times [2022-01-31 21:32:20,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:20,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525178680] [2022-01-31 21:32:20,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:20,138 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,153 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,154 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:20,168 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,210 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:20,210 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:20,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:20,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:20,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:20,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:20,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:22,714 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:22,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525178680] [2022-01-31 21:32:22,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1525178680] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:22,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:22,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2022-01-31 21:32:22,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702297594] [2022-01-31 21:32:22,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:22,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-01-31 21:32:22,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:22,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-01-31 21:32:22,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=6171, Unknown=0, NotChecked=0, Total=6480 [2022-01-31 21:32:22,716 INFO L87 Difference]: Start difference. First operand 157 states and 160 transitions. Second operand has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:28,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:28,139 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2022-01-31 21:32:28,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-01-31 21:32:28,140 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2022-01-31 21:32:28,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:28,140 INFO L225 Difference]: With dead ends: 166 [2022-01-31 21:32:28,140 INFO L226 Difference]: Without dead ends: 159 [2022-01-31 21:32:28,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3278 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=818, Invalid=22744, Unknown=0, NotChecked=0, Total=23562 [2022-01-31 21:32:28,141 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 151 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 10474 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 10623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 10474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:28,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 93 Invalid, 10623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 10474 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:32:28,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-01-31 21:32:28,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2022-01-31 21:32:28,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.025974025974026) internal successors, (158), 154 states have internal predecessors, (158), 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 21:32:28,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 162 transitions. [2022-01-31 21:32:28,150 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 162 transitions. Word has length 155 [2022-01-31 21:32:28,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:28,152 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 162 transitions. [2022-01-31 21:32:28,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:28,152 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 162 transitions. [2022-01-31 21:32:28,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-01-31 21:32:28,152 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:28,152 INFO L514 BasicCegarLoop]: trace histogram [73, 71, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:28,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-01-31 21:32:28,153 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:28,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:28,153 INFO L85 PathProgramCache]: Analyzing trace with hash -19039110, now seen corresponding path program 71 times [2022-01-31 21:32:28,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:28,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602530268] [2022-01-31 21:32:28,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:28,194 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,215 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,215 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:28,234 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:28,274 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:28,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:28,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:28,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:28,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:28,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:30,809 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:30,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602530268] [2022-01-31 21:32:30,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1602530268] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:30,809 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:30,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2022-01-31 21:32:30,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490473069] [2022-01-31 21:32:30,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:30,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-01-31 21:32:30,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:30,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-01-31 21:32:30,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=6329, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:32:30,810 INFO L87 Difference]: Start difference. First operand 159 states and 162 transitions. Second operand has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 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 21:32:36,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:36,490 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2022-01-31 21:32:36,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-01-31 21:32:36,490 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 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 21:32:36,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:36,491 INFO L225 Difference]: With dead ends: 168 [2022-01-31 21:32:36,491 INFO L226 Difference]: Without dead ends: 161 [2022-01-31 21:32:36,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3360 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=829, Invalid=23351, Unknown=0, NotChecked=0, Total=24180 [2022-01-31 21:32:36,492 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 153 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 11049 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 11200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 11049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:36,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 223 Invalid, 11200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 11049 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-01-31 21:32:36,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-01-31 21:32:36,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2022-01-31 21:32:36,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 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 21:32:36,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 164 transitions. [2022-01-31 21:32:36,501 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 164 transitions. Word has length 157 [2022-01-31 21:32:36,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:36,502 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 164 transitions. [2022-01-31 21:32:36,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 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 21:32:36,502 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 164 transitions. [2022-01-31 21:32:36,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-01-31 21:32:36,502 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:36,502 INFO L514 BasicCegarLoop]: trace histogram [74, 72, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:36,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-01-31 21:32:36,503 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:36,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:36,503 INFO L85 PathProgramCache]: Analyzing trace with hash -880282667, now seen corresponding path program 72 times [2022-01-31 21:32:36,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:36,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346655221] [2022-01-31 21:32:36,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:36,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:36,553 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:36,553 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:36,567 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:36,608 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:36,608 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:36,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:36,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:36,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:36,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:36,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:39,180 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:39,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346655221] [2022-01-31 21:32:39,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1346655221] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:39,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:39,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2022-01-31 21:32:39,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126223630] [2022-01-31 21:32:39,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:39,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-01-31 21:32:39,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:39,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-01-31 21:32:39,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=6489, Unknown=0, NotChecked=0, Total=6806 [2022-01-31 21:32:39,182 INFO L87 Difference]: Start difference. First operand 161 states and 164 transitions. Second operand has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:45,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:45,105 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2022-01-31 21:32:45,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-01-31 21:32:45,105 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 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 159 [2022-01-31 21:32:45,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:45,106 INFO L225 Difference]: With dead ends: 170 [2022-01-31 21:32:45,106 INFO L226 Difference]: Without dead ends: 163 [2022-01-31 21:32:45,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3443 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=840, Invalid=23966, Unknown=0, NotChecked=0, Total=24806 [2022-01-31 21:32:45,107 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 155 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 11584 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 11737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 11584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:45,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 333 Invalid, 11737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 11584 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-01-31 21:32:45,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-01-31 21:32:45,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-01-31 21:32:45,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0253164556962024) internal successors, (162), 158 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 21:32:45,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 166 transitions. [2022-01-31 21:32:45,123 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 166 transitions. Word has length 159 [2022-01-31 21:32:45,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:45,124 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 166 transitions. [2022-01-31 21:32:45,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:45,124 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 166 transitions. [2022-01-31 21:32:45,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-01-31 21:32:45,124 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:45,124 INFO L514 BasicCegarLoop]: trace histogram [75, 73, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:45,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-01-31 21:32:45,125 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:45,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:45,125 INFO L85 PathProgramCache]: Analyzing trace with hash 393347184, now seen corresponding path program 73 times [2022-01-31 21:32:45,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:45,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801930692] [2022-01-31 21:32:45,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:45,160 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,177 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,178 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:45,196 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,232 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:45,232 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:45,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:45,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:45,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:45,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:45,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:47,905 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:47,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801930692] [2022-01-31 21:32:47,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [801930692] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:47,905 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:47,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2022-01-31 21:32:47,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394528278] [2022-01-31 21:32:47,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:47,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-01-31 21:32:47,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:47,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-01-31 21:32:47,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=6651, Unknown=0, NotChecked=0, Total=6972 [2022-01-31 21:32:47,906 INFO L87 Difference]: Start difference. First operand 163 states and 166 transitions. Second operand has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:53,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:32:53,796 INFO L93 Difference]: Finished difference Result 172 states and 177 transitions. [2022-01-31 21:32:53,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-01-31 21:32:53,797 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2022-01-31 21:32:53,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:32:53,797 INFO L225 Difference]: With dead ends: 172 [2022-01-31 21:32:53,797 INFO L226 Difference]: Without dead ends: 165 [2022-01-31 21:32:53,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3527 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=851, Invalid=24589, Unknown=0, NotChecked=0, Total=25440 [2022-01-31 21:32:53,799 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 157 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 11287 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 11442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 11287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:32:53,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 63 Invalid, 11442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 11287 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-01-31 21:32:53,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-01-31 21:32:53,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2022-01-31 21:32:53,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.025) internal successors, (164), 160 states have internal predecessors, (164), 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 21:32:53,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 168 transitions. [2022-01-31 21:32:53,808 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 168 transitions. Word has length 161 [2022-01-31 21:32:53,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:32:53,808 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 168 transitions. [2022-01-31 21:32:53,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:32:53,809 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 168 transitions. [2022-01-31 21:32:53,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2022-01-31 21:32:53,809 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:32:53,809 INFO L514 BasicCegarLoop]: trace histogram [76, 74, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:32:53,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-01-31 21:32:53,809 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:32:53,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:32:53,810 INFO L85 PathProgramCache]: Analyzing trace with hash 285954635, now seen corresponding path program 74 times [2022-01-31 21:32:53,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:32:53,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533433485] [2022-01-31 21:32:53,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:32:53,847 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,875 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,875 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:53,890 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,931 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:32:53,931 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:32:53,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:32:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:54,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:32:54,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:32:54,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:32:56,663 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:32:56,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533433485] [2022-01-31 21:32:56,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [533433485] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:32:56,663 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:32:56,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2022-01-31 21:32:56,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114537130] [2022-01-31 21:32:56,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:32:56,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-01-31 21:32:56,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:32:56,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-01-31 21:32:56,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=6815, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:32:56,665 INFO L87 Difference]: Start difference. First operand 165 states and 168 transitions. Second operand has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 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 21:33:02,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:02,844 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2022-01-31 21:33:02,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-01-31 21:33:02,844 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 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 21:33:02,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:02,845 INFO L225 Difference]: With dead ends: 174 [2022-01-31 21:33:02,845 INFO L226 Difference]: Without dead ends: 167 [2022-01-31 21:33:02,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3612 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=862, Invalid=25220, Unknown=0, NotChecked=0, Total=26082 [2022-01-31 21:33:02,846 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 159 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 12073 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 12230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 12073 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:02,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 218 Invalid, 12230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 12073 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-01-31 21:33:02,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-01-31 21:33:02,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2022-01-31 21:33:02,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0246913580246915) internal successors, (166), 162 states have internal predecessors, (166), 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 21:33:02,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 170 transitions. [2022-01-31 21:33:02,856 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 170 transitions. Word has length 163 [2022-01-31 21:33:02,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:02,856 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 170 transitions. [2022-01-31 21:33:02,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 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 21:33:02,856 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 170 transitions. [2022-01-31 21:33:02,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-01-31 21:33:02,857 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:02,857 INFO L514 BasicCegarLoop]: trace histogram [77, 75, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:02,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-01-31 21:33:02,857 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:02,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:02,857 INFO L85 PathProgramCache]: Analyzing trace with hash 160930150, now seen corresponding path program 75 times [2022-01-31 21:33:02,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:02,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115811280] [2022-01-31 21:33:02,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:02,889 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:02,908 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:02,909 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:02,929 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:02,960 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:02,960 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:02,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:02,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:03,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:03,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:03,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:05,703 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:05,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115811280] [2022-01-31 21:33:05,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [115811280] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:05,703 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:05,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2022-01-31 21:33:05,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294734685] [2022-01-31 21:33:05,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:05,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-01-31 21:33:05,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:05,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-01-31 21:33:05,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=6981, Unknown=0, NotChecked=0, Total=7310 [2022-01-31 21:33:05,705 INFO L87 Difference]: Start difference. First operand 167 states and 170 transitions. Second operand has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:11,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:11,874 INFO L93 Difference]: Finished difference Result 176 states and 181 transitions. [2022-01-31 21:33:11,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-01-31 21:33:11,874 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 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 165 [2022-01-31 21:33:11,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:11,875 INFO L225 Difference]: With dead ends: 176 [2022-01-31 21:33:11,875 INFO L226 Difference]: Without dead ends: 169 [2022-01-31 21:33:11,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3698 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=873, Invalid=25859, Unknown=0, NotChecked=0, Total=26732 [2022-01-31 21:33:11,877 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 161 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 11904 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 12063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 11904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:11,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 68 Invalid, 12063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 11904 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-01-31 21:33:11,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-01-31 21:33:11,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2022-01-31 21:33:11,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.024390243902439) internal successors, (168), 164 states have internal predecessors, (168), 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 21:33:11,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 172 transitions. [2022-01-31 21:33:11,886 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 172 transitions. Word has length 165 [2022-01-31 21:33:11,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:11,886 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 172 transitions. [2022-01-31 21:33:11,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:11,886 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 172 transitions. [2022-01-31 21:33:11,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-01-31 21:33:11,887 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:11,887 INFO L514 BasicCegarLoop]: trace histogram [78, 76, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:11,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-01-31 21:33:11,887 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:11,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:11,887 INFO L85 PathProgramCache]: Analyzing trace with hash 271484353, now seen corresponding path program 76 times [2022-01-31 21:33:11,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:11,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460940230] [2022-01-31 21:33:11,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:11,929 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,950 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:11,950 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:11,977 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:12,019 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:12,020 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:12,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:12,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:12,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:12,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:12,113 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 21:33:14,902 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:14,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460940230] [2022-01-31 21:33:14,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [460940230] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:14,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:14,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-01-31 21:33:14,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446295260] [2022-01-31 21:33:14,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:14,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-01-31 21:33:14,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:14,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-01-31 21:33:14,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=7149, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:33:14,904 INFO L87 Difference]: Start difference. First operand 169 states and 172 transitions. Second operand has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:21,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:21,419 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2022-01-31 21:33:21,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-01-31 21:33:21,423 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2022-01-31 21:33:21,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:21,423 INFO L225 Difference]: With dead ends: 178 [2022-01-31 21:33:21,424 INFO L226 Difference]: Without dead ends: 171 [2022-01-31 21:33:21,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3785 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=884, Invalid=26506, Unknown=0, NotChecked=0, Total=27390 [2022-01-31 21:33:21,426 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 163 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 12812 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 12973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 12812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:21,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 273 Invalid, 12973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 12812 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-01-31 21:33:21,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-01-31 21:33:21,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2022-01-31 21:33:21,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.0240963855421688) internal successors, (170), 166 states have internal predecessors, (170), 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 21:33:21,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 174 transitions. [2022-01-31 21:33:21,435 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 174 transitions. Word has length 167 [2022-01-31 21:33:21,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:21,435 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 174 transitions. [2022-01-31 21:33:21,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:21,436 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 174 transitions. [2022-01-31 21:33:21,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-01-31 21:33:21,436 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:21,436 INFO L514 BasicCegarLoop]: trace histogram [79, 77, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:21,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-01-31 21:33:21,436 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:21,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:21,437 INFO L85 PathProgramCache]: Analyzing trace with hash -860108964, now seen corresponding path program 77 times [2022-01-31 21:33:21,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:21,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077592958] [2022-01-31 21:33:21,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:21,483 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:21,503 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:21,503 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:21,519 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:21,548 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:21,548 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:21,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:21,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:21,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:21,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:21,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:24,528 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:24,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077592958] [2022-01-31 21:33:24,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1077592958] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:24,529 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:24,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2022-01-31 21:33:24,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633400051] [2022-01-31 21:33:24,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:24,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-01-31 21:33:24,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:24,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-01-31 21:33:24,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=7319, Unknown=0, NotChecked=0, Total=7656 [2022-01-31 21:33:24,530 INFO L87 Difference]: Start difference. First operand 171 states and 174 transitions. Second operand has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 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 21:33:31,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:31,234 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2022-01-31 21:33:31,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-01-31 21:33:31,234 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 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 21:33:31,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:31,235 INFO L225 Difference]: With dead ends: 180 [2022-01-31 21:33:31,235 INFO L226 Difference]: Without dead ends: 173 [2022-01-31 21:33:31,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3873 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=895, Invalid=27161, Unknown=0, NotChecked=0, Total=28056 [2022-01-31 21:33:31,236 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 165 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 13076 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 13239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 13076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:31,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 318 Invalid, 13239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 13076 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-01-31 21:33:31,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-01-31 21:33:31,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2022-01-31 21:33:31,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0238095238095237) internal successors, (172), 168 states have internal predecessors, (172), 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 21:33:31,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 176 transitions. [2022-01-31 21:33:31,246 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 176 transitions. Word has length 169 [2022-01-31 21:33:31,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:31,246 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 176 transitions. [2022-01-31 21:33:31,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 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 21:33:31,246 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 176 transitions. [2022-01-31 21:33:31,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2022-01-31 21:33:31,247 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:31,247 INFO L514 BasicCegarLoop]: trace histogram [80, 78, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:31,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-01-31 21:33:31,247 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:31,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:31,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1694560713, now seen corresponding path program 78 times [2022-01-31 21:33:31,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:31,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752017638] [2022-01-31 21:33:31,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:31,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:31,302 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:31,302 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:31,318 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:31,350 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:31,350 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:31,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:31,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:31,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:31,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:34,295 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:34,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752017638] [2022-01-31 21:33:34,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1752017638] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:34,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:34,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2022-01-31 21:33:34,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463713846] [2022-01-31 21:33:34,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:34,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-01-31 21:33:34,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:34,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-01-31 21:33:34,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=7491, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:33:34,297 INFO L87 Difference]: Start difference. First operand 173 states and 176 transitions. Second operand has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:41,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:41,190 INFO L93 Difference]: Finished difference Result 182 states and 187 transitions. [2022-01-31 21:33:41,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-01-31 21:33:41,190 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 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 171 [2022-01-31 21:33:41,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:41,191 INFO L225 Difference]: With dead ends: 182 [2022-01-31 21:33:41,191 INFO L226 Difference]: Without dead ends: 175 [2022-01-31 21:33:41,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3962 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=906, Invalid=27824, Unknown=0, NotChecked=0, Total=28730 [2022-01-31 21:33:41,192 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 167 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 13754 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 13919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 13754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:41,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 413 Invalid, 13919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 13754 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-01-31 21:33:41,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-01-31 21:33:41,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-01-31 21:33:41,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0235294117647058) internal successors, (174), 170 states have internal predecessors, (174), 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 21:33:41,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 178 transitions. [2022-01-31 21:33:41,202 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 178 transitions. Word has length 171 [2022-01-31 21:33:41,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:41,202 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 178 transitions. [2022-01-31 21:33:41,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:41,202 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 178 transitions. [2022-01-31 21:33:41,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-01-31 21:33:41,203 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:41,203 INFO L514 BasicCegarLoop]: trace histogram [81, 79, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:41,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-01-31 21:33:41,203 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:41,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:41,203 INFO L85 PathProgramCache]: Analyzing trace with hash -443807150, now seen corresponding path program 79 times [2022-01-31 21:33:41,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:41,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156465402] [2022-01-31 21:33:41,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:41,234 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:41,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:41,262 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:41,278 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:41,308 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:41,308 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:41,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:41,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:41,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:41,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:41,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:33:44,303 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:44,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156465402] [2022-01-31 21:33:44,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1156465402] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:44,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:44,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2022-01-31 21:33:44,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350645392] [2022-01-31 21:33:44,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:44,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-01-31 21:33:44,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:44,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-01-31 21:33:44,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=7665, Unknown=0, NotChecked=0, Total=8010 [2022-01-31 21:33:44,305 INFO L87 Difference]: Start difference. First operand 175 states and 178 transitions. Second operand has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:51,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:33:51,219 INFO L93 Difference]: Finished difference Result 184 states and 189 transitions. [2022-01-31 21:33:51,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-01-31 21:33:51,219 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2022-01-31 21:33:51,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:33:51,220 INFO L225 Difference]: With dead ends: 184 [2022-01-31 21:33:51,220 INFO L226 Difference]: Without dead ends: 177 [2022-01-31 21:33:51,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4052 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=917, Invalid=28495, Unknown=0, NotChecked=0, Total=29412 [2022-01-31 21:33:51,221 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 169 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 13637 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 13804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 13637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:33:51,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 283 Invalid, 13804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 13637 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-01-31 21:33:51,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-01-31 21:33:51,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2022-01-31 21:33:51,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0232558139534884) internal successors, (176), 172 states have internal predecessors, (176), 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 21:33:51,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 180 transitions. [2022-01-31 21:33:51,231 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 180 transitions. Word has length 173 [2022-01-31 21:33:51,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:33:51,231 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 180 transitions. [2022-01-31 21:33:51,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:33:51,231 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 180 transitions. [2022-01-31 21:33:51,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2022-01-31 21:33:51,231 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:33:51,231 INFO L514 BasicCegarLoop]: trace histogram [82, 80, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:33:51,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2022-01-31 21:33:51,232 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:33:51,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:33:51,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1060475987, now seen corresponding path program 80 times [2022-01-31 21:33:51,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:33:51,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315653092] [2022-01-31 21:33:51,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:33:51,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:51,299 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:51,299 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:51,321 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:51,351 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:33:51,351 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:33:51,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:33:51,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:51,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:33:51,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:33:51,399 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 21:33:54,415 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:33:54,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315653092] [2022-01-31 21:33:54,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [315653092] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:33:54,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:33:54,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2022-01-31 21:33:54,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565168051] [2022-01-31 21:33:54,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:33:54,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-01-31 21:33:54,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:33:54,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-01-31 21:33:54,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=7841, Unknown=0, NotChecked=0, Total=8190 [2022-01-31 21:33:54,417 INFO L87 Difference]: Start difference. First operand 177 states and 180 transitions. Second operand has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:01,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:01,535 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2022-01-31 21:34:01,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-01-31 21:34:01,536 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 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 175 [2022-01-31 21:34:01,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:01,536 INFO L225 Difference]: With dead ends: 186 [2022-01-31 21:34:01,537 INFO L226 Difference]: Without dead ends: 179 [2022-01-31 21:34:01,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4143 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=928, Invalid=29174, Unknown=0, NotChecked=0, Total=30102 [2022-01-31 21:34:01,538 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 171 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 14096 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 14265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 14096 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:01,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 273 Invalid, 14265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 14096 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-01-31 21:34:01,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-01-31 21:34:01,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2022-01-31 21:34:01,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 174 states have (on average 1.0229885057471264) internal successors, (178), 174 states have internal predecessors, (178), 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 21:34:01,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 182 transitions. [2022-01-31 21:34:01,548 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 182 transitions. Word has length 175 [2022-01-31 21:34:01,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:01,548 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 182 transitions. [2022-01-31 21:34:01,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:01,548 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 182 transitions. [2022-01-31 21:34:01,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2022-01-31 21:34:01,549 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:01,549 INFO L514 BasicCegarLoop]: trace histogram [83, 81, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:01,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2022-01-31 21:34:01,549 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:01,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:01,549 INFO L85 PathProgramCache]: Analyzing trace with hash -973741496, now seen corresponding path program 81 times [2022-01-31 21:34:01,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:01,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947143707] [2022-01-31 21:34:01,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:01,580 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,601 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,601 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:01,616 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,645 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:01,646 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:01,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:01,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:01,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:01,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:01,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:04,781 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:04,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947143707] [2022-01-31 21:34:04,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1947143707] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:04,781 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:04,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2022-01-31 21:34:04,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055816758] [2022-01-31 21:34:04,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:04,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-01-31 21:34:04,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:04,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-01-31 21:34:04,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=8019, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:34:04,782 INFO L87 Difference]: Start difference. First operand 179 states and 182 transitions. Second operand has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:11,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:11,991 INFO L93 Difference]: Finished difference Result 188 states and 193 transitions. [2022-01-31 21:34:11,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-01-31 21:34:11,992 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 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 177 [2022-01-31 21:34:11,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:11,992 INFO L225 Difference]: With dead ends: 188 [2022-01-31 21:34:11,992 INFO L226 Difference]: Without dead ends: 181 [2022-01-31 21:34:11,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4235 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=939, Invalid=29861, Unknown=0, NotChecked=0, Total=30800 [2022-01-31 21:34:11,994 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 173 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 14335 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 14506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 14335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:11,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 303 Invalid, 14506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 14335 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-01-31 21:34:11,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-01-31 21:34:12,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2022-01-31 21:34:12,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0227272727272727) internal successors, (180), 176 states have internal predecessors, (180), 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 21:34:12,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 184 transitions. [2022-01-31 21:34:12,004 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 184 transitions. Word has length 177 [2022-01-31 21:34:12,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:12,004 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 184 transitions. [2022-01-31 21:34:12,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:12,004 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 184 transitions. [2022-01-31 21:34:12,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2022-01-31 21:34:12,004 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:12,004 INFO L514 BasicCegarLoop]: trace histogram [84, 82, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:12,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2022-01-31 21:34:12,005 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:12,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:12,005 INFO L85 PathProgramCache]: Analyzing trace with hash 773725731, now seen corresponding path program 82 times [2022-01-31 21:34:12,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:12,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517413012] [2022-01-31 21:34:12,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:12,047 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:12,066 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:12,067 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:12,086 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:12,116 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:12,116 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:12,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:12,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:12,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:12,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:12,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:15,329 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:15,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517413012] [2022-01-31 21:34:15,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1517413012] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:15,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:15,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2022-01-31 21:34:15,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128747508] [2022-01-31 21:34:15,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:15,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2022-01-31 21:34:15,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:15,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2022-01-31 21:34:15,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=8199, Unknown=0, NotChecked=0, Total=8556 [2022-01-31 21:34:15,331 INFO L87 Difference]: Start difference. First operand 181 states and 184 transitions. Second operand has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:22,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:22,674 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2022-01-31 21:34:22,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-01-31 21:34:22,674 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2022-01-31 21:34:22,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:22,675 INFO L225 Difference]: With dead ends: 190 [2022-01-31 21:34:22,675 INFO L226 Difference]: Without dead ends: 183 [2022-01-31 21:34:22,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=950, Invalid=30556, Unknown=0, NotChecked=0, Total=31506 [2022-01-31 21:34:22,676 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 175 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 14602 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 14775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 14602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:22,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 273 Invalid, 14775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 14602 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-01-31 21:34:22,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-01-31 21:34:22,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2022-01-31 21:34:22,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0224719101123596) internal successors, (182), 178 states have internal predecessors, (182), 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 21:34:22,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 186 transitions. [2022-01-31 21:34:22,687 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 186 transitions. Word has length 179 [2022-01-31 21:34:22,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:22,687 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 186 transitions. [2022-01-31 21:34:22,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:22,687 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 186 transitions. [2022-01-31 21:34:22,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-01-31 21:34:22,687 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:22,688 INFO L514 BasicCegarLoop]: trace histogram [85, 83, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:22,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2022-01-31 21:34:22,688 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:22,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:22,688 INFO L85 PathProgramCache]: Analyzing trace with hash 757518142, now seen corresponding path program 83 times [2022-01-31 21:34:22,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:22,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074717425] [2022-01-31 21:34:22,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:22,729 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,748 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,749 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:22,763 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,805 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:22,805 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:22,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:22,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:22,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:22,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:26,059 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:26,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074717425] [2022-01-31 21:34:26,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2074717425] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:26,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:26,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2022-01-31 21:34:26,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743313466] [2022-01-31 21:34:26,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:26,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-01-31 21:34:26,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:26,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-01-31 21:34:26,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=8381, Unknown=0, NotChecked=0, Total=8742 [2022-01-31 21:34:26,061 INFO L87 Difference]: Start difference. First operand 183 states and 186 transitions. Second operand has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:33,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:33,731 INFO L93 Difference]: Finished difference Result 192 states and 197 transitions. [2022-01-31 21:34:33,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-01-31 21:34:33,732 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 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 181 [2022-01-31 21:34:33,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:33,732 INFO L225 Difference]: With dead ends: 192 [2022-01-31 21:34:33,732 INFO L226 Difference]: Without dead ends: 185 [2022-01-31 21:34:33,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4422 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=961, Invalid=31259, Unknown=0, NotChecked=0, Total=32220 [2022-01-31 21:34:33,734 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 177 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 15464 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 15639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 15464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:33,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 438 Invalid, 15639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 15464 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-01-31 21:34:33,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-01-31 21:34:33,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2022-01-31 21:34:33,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.0222222222222221) internal successors, (184), 180 states have internal predecessors, (184), 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 21:34:33,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 188 transitions. [2022-01-31 21:34:33,745 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 188 transitions. Word has length 181 [2022-01-31 21:34:33,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:33,745 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 188 transitions. [2022-01-31 21:34:33,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:33,745 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 188 transitions. [2022-01-31 21:34:33,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2022-01-31 21:34:33,746 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:33,746 INFO L514 BasicCegarLoop]: trace histogram [86, 84, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:33,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2022-01-31 21:34:33,746 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:33,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:33,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1933072999, now seen corresponding path program 84 times [2022-01-31 21:34:33,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:33,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852485283] [2022-01-31 21:34:33,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:33,778 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:33,793 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:33,794 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:33,814 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:33,857 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:33,857 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:33,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:33,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:33,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:33,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:33,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:37,164 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:37,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852485283] [2022-01-31 21:34:37,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [852485283] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:37,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:37,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2022-01-31 21:34:37,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474556489] [2022-01-31 21:34:37,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:37,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-01-31 21:34:37,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:37,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-01-31 21:34:37,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=8565, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:34:37,166 INFO L87 Difference]: Start difference. First operand 185 states and 188 transitions. Second operand has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:44,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:44,847 INFO L93 Difference]: Finished difference Result 194 states and 199 transitions. [2022-01-31 21:34:44,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-01-31 21:34:44,848 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 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 183 [2022-01-31 21:34:44,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:44,848 INFO L225 Difference]: With dead ends: 194 [2022-01-31 21:34:44,848 INFO L226 Difference]: Without dead ends: 187 [2022-01-31 21:34:44,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4517 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=972, Invalid=31970, Unknown=0, NotChecked=0, Total=32942 [2022-01-31 21:34:44,850 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 179 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 15203 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 15380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 15203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:44,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 238 Invalid, 15380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 15203 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-01-31 21:34:44,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-01-31 21:34:44,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2022-01-31 21:34:44,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.021978021978022) internal successors, (186), 182 states have internal predecessors, (186), 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 21:34:44,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 190 transitions. [2022-01-31 21:34:44,867 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 190 transitions. Word has length 183 [2022-01-31 21:34:44,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:44,867 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 190 transitions. [2022-01-31 21:34:44,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:44,867 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 190 transitions. [2022-01-31 21:34:44,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2022-01-31 21:34:44,868 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:44,868 INFO L514 BasicCegarLoop]: trace histogram [87, 85, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:44,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2022-01-31 21:34:44,869 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:44,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:44,869 INFO L85 PathProgramCache]: Analyzing trace with hash -2020847308, now seen corresponding path program 85 times [2022-01-31 21:34:44,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:44,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747013610] [2022-01-31 21:34:44,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:44,900 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,925 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,925 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:44,942 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,984 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:44,985 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:44,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:44,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:45,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:45,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:45,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:48,388 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:48,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747013610] [2022-01-31 21:34:48,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1747013610] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:48,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:48,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2022-01-31 21:34:48,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337721317] [2022-01-31 21:34:48,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:48,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-01-31 21:34:48,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:48,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-01-31 21:34:48,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=8751, Unknown=0, NotChecked=0, Total=9120 [2022-01-31 21:34:48,390 INFO L87 Difference]: Start difference. First operand 187 states and 190 transitions. Second operand has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:56,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:34:56,144 INFO L93 Difference]: Finished difference Result 196 states and 201 transitions. [2022-01-31 21:34:56,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-01-31 21:34:56,145 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2022-01-31 21:34:56,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:34:56,145 INFO L225 Difference]: With dead ends: 196 [2022-01-31 21:34:56,145 INFO L226 Difference]: Without dead ends: 189 [2022-01-31 21:34:56,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4613 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=983, Invalid=32689, Unknown=0, NotChecked=0, Total=33672 [2022-01-31 21:34:56,147 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 181 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 15306 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 15485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 15306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:34:56,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 128 Invalid, 15485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 15306 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-01-31 21:34:56,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2022-01-31 21:34:56,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2022-01-31 21:34:56,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 184 states have (on average 1.0217391304347827) internal successors, (188), 184 states have internal predecessors, (188), 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 21:34:56,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 192 transitions. [2022-01-31 21:34:56,157 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 192 transitions. Word has length 185 [2022-01-31 21:34:56,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:34:56,157 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 192 transitions. [2022-01-31 21:34:56,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:34:56,157 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 192 transitions. [2022-01-31 21:34:56,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-01-31 21:34:56,158 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:34:56,158 INFO L514 BasicCegarLoop]: trace histogram [88, 86, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:34:56,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2022-01-31 21:34:56,158 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:34:56,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:34:56,158 INFO L85 PathProgramCache]: Analyzing trace with hash -472612337, now seen corresponding path program 86 times [2022-01-31 21:34:56,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:34:56,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481994669] [2022-01-31 21:34:56,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:34:56,196 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,210 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,211 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:56,237 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,276 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:34:56,276 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:34:56,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:34:56,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:56,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:34:56,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:34:56,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:34:59,710 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:34:59,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481994669] [2022-01-31 21:34:59,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [481994669] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:34:59,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:34:59,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2022-01-31 21:34:59,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213089697] [2022-01-31 21:34:59,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:34:59,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-01-31 21:34:59,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:34:59,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-01-31 21:34:59,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=8939, Unknown=0, NotChecked=0, Total=9312 [2022-01-31 21:34:59,712 INFO L87 Difference]: Start difference. First operand 189 states and 192 transitions. Second operand has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:07,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:07,673 INFO L93 Difference]: Finished difference Result 198 states and 203 transitions. [2022-01-31 21:35:07,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-01-31 21:35:07,674 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 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 187 [2022-01-31 21:35:07,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:07,674 INFO L225 Difference]: With dead ends: 198 [2022-01-31 21:35:07,674 INFO L226 Difference]: Without dead ends: 191 [2022-01-31 21:35:07,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4710 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=994, Invalid=33416, Unknown=0, NotChecked=0, Total=34410 [2022-01-31 21:35:07,676 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 183 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 15941 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 16122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 15941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:07,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 258 Invalid, 16122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 15941 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-01-31 21:35:07,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-01-31 21:35:07,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2022-01-31 21:35:07,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 186 states have (on average 1.021505376344086) internal successors, (190), 186 states have internal predecessors, (190), 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 21:35:07,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 194 transitions. [2022-01-31 21:35:07,687 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 194 transitions. Word has length 187 [2022-01-31 21:35:07,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:07,687 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 194 transitions. [2022-01-31 21:35:07,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:07,687 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 194 transitions. [2022-01-31 21:35:07,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-01-31 21:35:07,687 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:07,687 INFO L514 BasicCegarLoop]: trace histogram [89, 87, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:07,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2022-01-31 21:35:07,688 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:07,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:07,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1322510378, now seen corresponding path program 87 times [2022-01-31 21:35:07,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:07,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847336876] [2022-01-31 21:35:07,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:07,722 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:07,751 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:07,751 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:07,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:07,795 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:07,795 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:07,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:07,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:07,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:07,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:07,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:11,308 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:11,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847336876] [2022-01-31 21:35:11,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [847336876] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:11,308 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:11,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2022-01-31 21:35:11,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181014778] [2022-01-31 21:35:11,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:11,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-01-31 21:35:11,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:11,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-01-31 21:35:11,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=9129, Unknown=0, NotChecked=0, Total=9506 [2022-01-31 21:35:11,309 INFO L87 Difference]: Start difference. First operand 191 states and 194 transitions. Second operand has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:19,660 INFO L93 Difference]: Finished difference Result 200 states and 205 transitions. [2022-01-31 21:35:19,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-01-31 21:35:19,660 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 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 189 [2022-01-31 21:35:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:19,661 INFO L225 Difference]: With dead ends: 200 [2022-01-31 21:35:19,661 INFO L226 Difference]: Without dead ends: 193 [2022-01-31 21:35:19,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4808 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1005, Invalid=34151, Unknown=0, NotChecked=0, Total=35156 [2022-01-31 21:35:19,662 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 185 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 16838 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 17021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 16838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:19,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 428 Invalid, 17021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 16838 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2022-01-31 21:35:19,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2022-01-31 21:35:19,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2022-01-31 21:35:19,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0212765957446808) internal successors, (192), 188 states have internal predecessors, (192), 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 21:35:19,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 196 transitions. [2022-01-31 21:35:19,673 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 196 transitions. Word has length 189 [2022-01-31 21:35:19,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:19,673 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 196 transitions. [2022-01-31 21:35:19,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:19,673 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 196 transitions. [2022-01-31 21:35:19,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2022-01-31 21:35:19,674 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:19,674 INFO L514 BasicCegarLoop]: trace histogram [90, 88, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:19,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2022-01-31 21:35:19,674 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:19,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:19,674 INFO L85 PathProgramCache]: Analyzing trace with hash -141413499, now seen corresponding path program 88 times [2022-01-31 21:35:19,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:19,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825218584] [2022-01-31 21:35:19,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:19,705 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:19,719 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:19,720 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:19,734 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:19,774 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:19,775 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:19,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:19,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:19,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:19,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:19,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:23,384 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:23,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825218584] [2022-01-31 21:35:23,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1825218584] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:23,385 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:23,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2022-01-31 21:35:23,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949219260] [2022-01-31 21:35:23,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:23,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-01-31 21:35:23,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:23,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-01-31 21:35:23,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=9321, Unknown=0, NotChecked=0, Total=9702 [2022-01-31 21:35:23,386 INFO L87 Difference]: Start difference. First operand 193 states and 196 transitions. Second operand has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:31,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:31,794 INFO L93 Difference]: Finished difference Result 202 states and 207 transitions. [2022-01-31 21:35:31,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-01-31 21:35:31,794 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2022-01-31 21:35:31,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:31,795 INFO L225 Difference]: With dead ends: 202 [2022-01-31 21:35:31,795 INFO L226 Difference]: Without dead ends: 195 [2022-01-31 21:35:31,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1016, Invalid=34894, Unknown=0, NotChecked=0, Total=35910 [2022-01-31 21:35:31,796 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 187 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 16889 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 17074 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 16889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:31,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 288 Invalid, 17074 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 16889 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2022-01-31 21:35:31,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-01-31 21:35:31,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-01-31 21:35:31,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.0210526315789474) internal successors, (194), 190 states have internal predecessors, (194), 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 21:35:31,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 198 transitions. [2022-01-31 21:35:31,807 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 198 transitions. Word has length 191 [2022-01-31 21:35:31,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:31,807 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 198 transitions. [2022-01-31 21:35:31,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:31,808 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 198 transitions. [2022-01-31 21:35:31,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2022-01-31 21:35:31,808 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:31,808 INFO L514 BasicCegarLoop]: trace histogram [91, 89, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:31,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2022-01-31 21:35:31,808 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:31,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:31,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1777013792, now seen corresponding path program 89 times [2022-01-31 21:35:31,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:31,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689883151] [2022-01-31 21:35:31,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:31,840 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,861 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,861 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:31,876 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,916 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:31,916 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:31,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:31,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:31,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:31,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:31,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:35,572 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:35,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689883151] [2022-01-31 21:35:35,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [689883151] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:35,572 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:35,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2022-01-31 21:35:35,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816949245] [2022-01-31 21:35:35,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:35,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-01-31 21:35:35,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:35,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-01-31 21:35:35,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=9515, Unknown=0, NotChecked=0, Total=9900 [2022-01-31 21:35:35,574 INFO L87 Difference]: Start difference. First operand 195 states and 198 transitions. Second operand has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:44,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:44,214 INFO L93 Difference]: Finished difference Result 204 states and 209 transitions. [2022-01-31 21:35:44,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-01-31 21:35:44,214 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 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 193 [2022-01-31 21:35:44,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:44,215 INFO L225 Difference]: With dead ends: 204 [2022-01-31 21:35:44,215 INFO L226 Difference]: Without dead ends: 197 [2022-01-31 21:35:44,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5007 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1027, Invalid=35645, Unknown=0, NotChecked=0, Total=36672 [2022-01-31 21:35:44,217 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 189 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 17450 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 17637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 17450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:44,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 378 Invalid, 17637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 17450 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-01-31 21:35:44,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-01-31 21:35:44,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2022-01-31 21:35:44,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.0208333333333333) internal successors, (196), 192 states have internal predecessors, (196), 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 21:35:44,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 200 transitions. [2022-01-31 21:35:44,234 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 200 transitions. Word has length 193 [2022-01-31 21:35:44,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:44,234 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 200 transitions. [2022-01-31 21:35:44,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:44,234 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 200 transitions. [2022-01-31 21:35:44,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2022-01-31 21:35:44,235 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:44,235 INFO L514 BasicCegarLoop]: trace histogram [92, 90, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:44,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2022-01-31 21:35:44,235 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:44,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:44,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1450296837, now seen corresponding path program 90 times [2022-01-31 21:35:44,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:44,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211583309] [2022-01-31 21:35:44,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:44,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:44,305 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:44,305 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:44,328 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:44,358 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:44,358 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:44,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:44,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:44,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:44,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:44,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:35:48,150 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:35:48,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211583309] [2022-01-31 21:35:48,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211583309] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:35:48,150 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:35:48,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2022-01-31 21:35:48,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703069799] [2022-01-31 21:35:48,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:35:48,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-01-31 21:35:48,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:35:48,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-01-31 21:35:48,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=9711, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:35:48,151 INFO L87 Difference]: Start difference. First operand 197 states and 200 transitions. Second operand has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:56,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:35:56,953 INFO L93 Difference]: Finished difference Result 206 states and 211 transitions. [2022-01-31 21:35:56,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-01-31 21:35:56,954 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 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 195 [2022-01-31 21:35:56,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:35:56,954 INFO L225 Difference]: With dead ends: 206 [2022-01-31 21:35:56,954 INFO L226 Difference]: Without dead ends: 199 [2022-01-31 21:35:56,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5108 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1038, Invalid=36404, Unknown=0, NotChecked=0, Total=37442 [2022-01-31 21:35:56,956 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 191 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 17795 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 17984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 17795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:35:56,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 448 Invalid, 17984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 17795 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:35:56,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-01-31 21:35:56,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2022-01-31 21:35:56,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0206185567010309) internal successors, (198), 194 states have internal predecessors, (198), 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 21:35:56,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 202 transitions. [2022-01-31 21:35:56,967 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 202 transitions. Word has length 195 [2022-01-31 21:35:56,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:35:56,967 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 202 transitions. [2022-01-31 21:35:56,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:35:56,967 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 202 transitions. [2022-01-31 21:35:56,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2022-01-31 21:35:56,968 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:35:56,968 INFO L514 BasicCegarLoop]: trace histogram [93, 91, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:35:56,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2022-01-31 21:35:56,968 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:35:56,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:35:56,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1929423594, now seen corresponding path program 91 times [2022-01-31 21:35:56,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:35:56,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418578559] [2022-01-31 21:35:56,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:35:57,009 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:57,025 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:57,025 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:57,044 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:57,084 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:35:57,084 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:35:57,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:35:57,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:57,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:35:57,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:35:57,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:00,857 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:00,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418578559] [2022-01-31 21:36:00,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [418578559] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:00,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:00,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2022-01-31 21:36:00,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144927157] [2022-01-31 21:36:00,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:00,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-01-31 21:36:00,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:00,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-01-31 21:36:00,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=9909, Unknown=0, NotChecked=0, Total=10302 [2022-01-31 21:36:00,859 INFO L87 Difference]: Start difference. First operand 199 states and 202 transitions. Second operand has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:09,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:09,873 INFO L93 Difference]: Finished difference Result 208 states and 213 transitions. [2022-01-31 21:36:09,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2022-01-31 21:36:09,873 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 197 [2022-01-31 21:36:09,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:09,874 INFO L225 Difference]: With dead ends: 208 [2022-01-31 21:36:09,874 INFO L226 Difference]: Without dead ends: 201 [2022-01-31 21:36:09,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5210 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=1049, Invalid=37171, Unknown=0, NotChecked=0, Total=38220 [2022-01-31 21:36:09,876 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 193 mSDsluCounter, 477 mSDsCounter, 0 mSdLazyCounter, 18252 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 18443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 18252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:09,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 488 Invalid, 18443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 18252 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-01-31 21:36:09,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-01-31 21:36:09,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2022-01-31 21:36:09,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.0204081632653061) internal successors, (200), 196 states have internal predecessors, (200), 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 21:36:09,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 204 transitions. [2022-01-31 21:36:09,887 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 204 transitions. Word has length 197 [2022-01-31 21:36:09,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:09,887 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 204 transitions. [2022-01-31 21:36:09,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:09,887 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 204 transitions. [2022-01-31 21:36:09,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2022-01-31 21:36:09,888 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:09,888 INFO L514 BasicCegarLoop]: trace histogram [94, 92, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:09,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2022-01-31 21:36:09,888 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:09,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:09,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1486230897, now seen corresponding path program 92 times [2022-01-31 21:36:09,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:09,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955744690] [2022-01-31 21:36:09,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:09,920 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:09,934 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:09,934 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:09,954 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:09,993 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:09,994 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:09,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:10,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:10,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:10,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:13,855 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:13,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955744690] [2022-01-31 21:36:13,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [955744690] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:13,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:13,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2022-01-31 21:36:13,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656893868] [2022-01-31 21:36:13,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:13,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-01-31 21:36:13,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:13,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-01-31 21:36:13,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=10109, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:36:13,856 INFO L87 Difference]: Start difference. First operand 201 states and 204 transitions. Second operand has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:22,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:22,856 INFO L93 Difference]: Finished difference Result 210 states and 215 transitions. [2022-01-31 21:36:22,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-01-31 21:36:22,857 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 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 199 [2022-01-31 21:36:22,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:22,857 INFO L225 Difference]: With dead ends: 210 [2022-01-31 21:36:22,858 INFO L226 Difference]: Without dead ends: 203 [2022-01-31 21:36:22,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5313 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1060, Invalid=37946, Unknown=0, NotChecked=0, Total=39006 [2022-01-31 21:36:22,859 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 195 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 18013 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 18206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 18013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:22,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 128 Invalid, 18206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 18013 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:36:22,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-01-31 21:36:22,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2022-01-31 21:36:22,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.02020202020202) internal successors, (202), 198 states have internal predecessors, (202), 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 21:36:22,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 206 transitions. [2022-01-31 21:36:22,870 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 206 transitions. Word has length 199 [2022-01-31 21:36:22,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:22,870 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 206 transitions. [2022-01-31 21:36:22,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:22,870 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 206 transitions. [2022-01-31 21:36:22,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2022-01-31 21:36:22,871 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:22,871 INFO L514 BasicCegarLoop]: trace histogram [95, 93, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:22,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2022-01-31 21:36:22,871 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:22,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:22,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1719784692, now seen corresponding path program 93 times [2022-01-31 21:36:22,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:22,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066109346] [2022-01-31 21:36:22,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:22,913 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,927 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,928 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:22,942 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,972 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:22,972 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:22,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:22,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:23,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:23,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:23,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:26,890 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:26,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066109346] [2022-01-31 21:36:26,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2066109346] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:26,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:26,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2022-01-31 21:36:26,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496353216] [2022-01-31 21:36:26,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:26,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-01-31 21:36:26,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:26,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-01-31 21:36:26,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=10311, Unknown=0, NotChecked=0, Total=10712 [2022-01-31 21:36:26,891 INFO L87 Difference]: Start difference. First operand 203 states and 206 transitions. Second operand has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:36,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:36,244 INFO L93 Difference]: Finished difference Result 212 states and 217 transitions. [2022-01-31 21:36:36,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2022-01-31 21:36:36,244 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 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 201 [2022-01-31 21:36:36,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:36,245 INFO L225 Difference]: With dead ends: 212 [2022-01-31 21:36:36,245 INFO L226 Difference]: Without dead ends: 205 [2022-01-31 21:36:36,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5417 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1071, Invalid=38729, Unknown=0, NotChecked=0, Total=39800 [2022-01-31 21:36:36,247 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 197 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 18898 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 19093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 18898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:36,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 358 Invalid, 19093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 18898 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2022-01-31 21:36:36,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-01-31 21:36:36,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2022-01-31 21:36:36,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.02) internal successors, (204), 200 states have internal predecessors, (204), 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 21:36:36,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 208 transitions. [2022-01-31 21:36:36,258 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 208 transitions. Word has length 201 [2022-01-31 21:36:36,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:36,258 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 208 transitions. [2022-01-31 21:36:36,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:36,258 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 208 transitions. [2022-01-31 21:36:36,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2022-01-31 21:36:36,259 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:36,259 INFO L514 BasicCegarLoop]: trace histogram [96, 94, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:36,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2022-01-31 21:36:36,259 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:36,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:36,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1085752807, now seen corresponding path program 94 times [2022-01-31 21:36:36,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:36,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130420942] [2022-01-31 21:36:36,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:36,312 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:36,327 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:36,327 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:36,347 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:36,379 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:36,379 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:36,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:36,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:36,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:36,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:40,410 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:40,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130420942] [2022-01-31 21:36:40,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [130420942] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:40,411 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:40,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2022-01-31 21:36:40,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378329106] [2022-01-31 21:36:40,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:40,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-01-31 21:36:40,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:40,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-01-31 21:36:40,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=10515, Unknown=0, NotChecked=0, Total=10920 [2022-01-31 21:36:40,412 INFO L87 Difference]: Start difference. First operand 205 states and 208 transitions. Second operand has 102 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:49,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:36:49,809 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2022-01-31 21:36:49,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-01-31 21:36:49,810 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 2 states have call successors, (3), 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 203 [2022-01-31 21:36:49,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:36:49,810 INFO L225 Difference]: With dead ends: 214 [2022-01-31 21:36:49,811 INFO L226 Difference]: Without dead ends: 207 [2022-01-31 21:36:49,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5522 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1082, Invalid=39520, Unknown=0, NotChecked=0, Total=40602 [2022-01-31 21:36:49,812 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 199 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 18808 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 19005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 18808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:36:49,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 143 Invalid, 19005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 18808 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2022-01-31 21:36:49,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-01-31 21:36:49,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2022-01-31 21:36:49,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 202 states have (on average 1.0198019801980198) internal successors, (206), 202 states have internal predecessors, (206), 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 21:36:49,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 210 transitions. [2022-01-31 21:36:49,824 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 210 transitions. Word has length 203 [2022-01-31 21:36:49,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:36:49,824 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 210 transitions. [2022-01-31 21:36:49,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 101 states have (on average 1.9702970297029703) internal successors, (199), 100 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:36:49,824 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 210 transitions. [2022-01-31 21:36:49,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2022-01-31 21:36:49,825 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:36:49,825 INFO L514 BasicCegarLoop]: trace histogram [97, 95, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:36:49,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2022-01-31 21:36:49,825 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:36:49,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:36:49,825 INFO L85 PathProgramCache]: Analyzing trace with hash -32172542, now seen corresponding path program 95 times [2022-01-31 21:36:49,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:36:49,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86119162] [2022-01-31 21:36:49,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:36:49,866 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:49,883 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:49,883 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:49,898 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:49,928 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:36:49,928 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:36:49,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:36:49,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:49,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:36:49,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:36:49,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:36:54,021 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:36:54,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86119162] [2022-01-31 21:36:54,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [86119162] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:36:54,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:36:54,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2022-01-31 21:36:54,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086562996] [2022-01-31 21:36:54,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:36:54,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-01-31 21:36:54,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:36:54,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-01-31 21:36:54,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=10721, Unknown=0, NotChecked=0, Total=11130 [2022-01-31 21:36:54,023 INFO L87 Difference]: Start difference. First operand 207 states and 210 transitions. Second operand has 103 states, 102 states have (on average 1.9705882352941178) internal successors, (201), 101 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:03,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:03,682 INFO L93 Difference]: Finished difference Result 216 states and 221 transitions. [2022-01-31 21:37:03,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-01-31 21:37:03,682 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 102 states have (on average 1.9705882352941178) internal successors, (201), 101 states have internal predecessors, (201), 2 states have call successors, (3), 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 205 [2022-01-31 21:37:03,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:03,683 INFO L225 Difference]: With dead ends: 216 [2022-01-31 21:37:03,683 INFO L226 Difference]: Without dead ends: 209 [2022-01-31 21:37:03,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5628 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1093, Invalid=40319, Unknown=0, NotChecked=0, Total=41412 [2022-01-31 21:37:03,685 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 201 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 19536 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 19735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 19536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:03,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 298 Invalid, 19735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 19536 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-01-31 21:37:03,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-01-31 21:37:03,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2022-01-31 21:37:03,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 204 states have (on average 1.0196078431372548) internal successors, (208), 204 states have internal predecessors, (208), 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 21:37:03,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 212 transitions. [2022-01-31 21:37:03,696 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 212 transitions. Word has length 205 [2022-01-31 21:37:03,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:03,696 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 212 transitions. [2022-01-31 21:37:03,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 102 states have (on average 1.9705882352941178) internal successors, (201), 101 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:03,697 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 212 transitions. [2022-01-31 21:37:03,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2022-01-31 21:37:03,697 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:03,697 INFO L514 BasicCegarLoop]: trace histogram [98, 96, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:03,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2022-01-31 21:37:03,697 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:03,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:03,698 INFO L85 PathProgramCache]: Analyzing trace with hash -616608931, now seen corresponding path program 96 times [2022-01-31 21:37:03,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:03,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438183467] [2022-01-31 21:37:03,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:03,739 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:03,753 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:03,753 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:03,768 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:03,801 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:03,801 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:03,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:03,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:03,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:03,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:03,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:07,949 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:07,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438183467] [2022-01-31 21:37:07,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1438183467] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:07,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:07,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2022-01-31 21:37:07,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368406859] [2022-01-31 21:37:07,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:07,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-01-31 21:37:07,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:07,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-01-31 21:37:07,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=10929, Unknown=0, NotChecked=0, Total=11342 [2022-01-31 21:37:07,951 INFO L87 Difference]: Start difference. First operand 209 states and 212 transitions. Second operand has 104 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:17,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:17,725 INFO L93 Difference]: Finished difference Result 218 states and 223 transitions. [2022-01-31 21:37:17,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-01-31 21:37:17,726 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 2 states have call successors, (3), 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 207 [2022-01-31 21:37:17,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:17,727 INFO L225 Difference]: With dead ends: 218 [2022-01-31 21:37:17,727 INFO L226 Difference]: Without dead ends: 211 [2022-01-31 21:37:17,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5735 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1104, Invalid=41126, Unknown=0, NotChecked=0, Total=42230 [2022-01-31 21:37:17,728 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 203 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 19608 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 19809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 19608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:17,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 153 Invalid, 19809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 19608 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-01-31 21:37:17,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-01-31 21:37:17,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2022-01-31 21:37:17,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0194174757281553) internal successors, (210), 206 states have internal predecessors, (210), 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 21:37:17,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 214 transitions. [2022-01-31 21:37:17,740 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 214 transitions. Word has length 207 [2022-01-31 21:37:17,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:17,740 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 214 transitions. [2022-01-31 21:37:17,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:17,740 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 214 transitions. [2022-01-31 21:37:17,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2022-01-31 21:37:17,741 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:17,741 INFO L514 BasicCegarLoop]: trace histogram [99, 97, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:17,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2022-01-31 21:37:17,741 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:17,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:17,741 INFO L85 PathProgramCache]: Analyzing trace with hash 380737016, now seen corresponding path program 97 times [2022-01-31 21:37:17,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:17,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941692250] [2022-01-31 21:37:17,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:17,773 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,793 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,794 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:17,808 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,838 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:17,838 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:17,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:17,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:17,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:17,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:22,077 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:22,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941692250] [2022-01-31 21:37:22,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [941692250] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:22,078 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:22,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2022-01-31 21:37:22,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953506651] [2022-01-31 21:37:22,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:22,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-01-31 21:37:22,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:22,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-01-31 21:37:22,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=11139, Unknown=0, NotChecked=0, Total=11556 [2022-01-31 21:37:22,079 INFO L87 Difference]: Start difference. First operand 211 states and 214 transitions. Second operand has 105 states, 104 states have (on average 1.9711538461538463) internal successors, (205), 103 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:32,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:32,003 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2022-01-31 21:37:32,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-01-31 21:37:32,003 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 104 states have (on average 1.9711538461538463) internal successors, (205), 103 states have internal predecessors, (205), 2 states have call successors, (3), 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 209 [2022-01-31 21:37:32,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:32,004 INFO L225 Difference]: With dead ends: 220 [2022-01-31 21:37:32,004 INFO L226 Difference]: Without dead ends: 213 [2022-01-31 21:37:32,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5843 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1115, Invalid=41941, Unknown=0, NotChecked=0, Total=43056 [2022-01-31 21:37:32,006 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 205 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 19750 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 19750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:32,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 38 Invalid, 19953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 19750 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-01-31 21:37:32,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-01-31 21:37:32,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2022-01-31 21:37:32,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.0192307692307692) internal successors, (212), 208 states have internal predecessors, (212), 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 21:37:32,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 216 transitions. [2022-01-31 21:37:32,018 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 216 transitions. Word has length 209 [2022-01-31 21:37:32,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:32,018 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 216 transitions. [2022-01-31 21:37:32,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 104 states have (on average 1.9711538461538463) internal successors, (205), 103 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:32,018 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 216 transitions. [2022-01-31 21:37:32,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2022-01-31 21:37:32,019 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:32,019 INFO L514 BasicCegarLoop]: trace histogram [100, 98, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:32,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2022-01-31 21:37:32,019 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:32,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:32,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1052485075, now seen corresponding path program 98 times [2022-01-31 21:37:32,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:32,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731211113] [2022-01-31 21:37:32,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:32,056 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,072 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,073 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:32,087 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,127 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:32,127 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:32,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:32,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:32,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:32,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:32,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:36,488 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:36,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731211113] [2022-01-31 21:37:36,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [731211113] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:36,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:36,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2022-01-31 21:37:36,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579839653] [2022-01-31 21:37:36,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:36,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-01-31 21:37:36,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:36,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-01-31 21:37:36,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=11351, Unknown=0, NotChecked=0, Total=11772 [2022-01-31 21:37:36,490 INFO L87 Difference]: Start difference. First operand 213 states and 216 transitions. Second operand has 106 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:46,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:37:46,593 INFO L93 Difference]: Finished difference Result 222 states and 227 transitions. [2022-01-31 21:37:46,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-01-31 21:37:46,593 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 2 states have call successors, (3), 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 211 [2022-01-31 21:37:46,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:37:46,594 INFO L225 Difference]: With dead ends: 222 [2022-01-31 21:37:46,594 INFO L226 Difference]: Without dead ends: 215 [2022-01-31 21:37:46,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5952 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1126, Invalid=42764, Unknown=0, NotChecked=0, Total=43890 [2022-01-31 21:37:46,596 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 207 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 20122 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 20327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 20122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:37:46,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 113 Invalid, 20327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 20122 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-01-31 21:37:46,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-01-31 21:37:46,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2022-01-31 21:37:46,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 210 states have (on average 1.019047619047619) internal successors, (214), 210 states have internal predecessors, (214), 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 21:37:46,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 218 transitions. [2022-01-31 21:37:46,608 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 218 transitions. Word has length 211 [2022-01-31 21:37:46,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:37:46,608 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 218 transitions. [2022-01-31 21:37:46,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 1.9714285714285715) internal successors, (207), 104 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:37:46,608 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 218 transitions. [2022-01-31 21:37:46,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2022-01-31 21:37:46,609 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:37:46,609 INFO L514 BasicCegarLoop]: trace histogram [101, 99, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:37:46,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2022-01-31 21:37:46,609 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:37:46,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:37:46,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1937691922, now seen corresponding path program 99 times [2022-01-31 21:37:46,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:37:46,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780578937] [2022-01-31 21:37:46,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:37:46,651 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:46,666 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:46,666 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:46,680 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:46,710 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:37:46,710 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:37:46,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:37:46,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:46,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:37:46,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:37:46,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:37:51,106 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:37:51,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780578937] [2022-01-31 21:37:51,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [780578937] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:37:51,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:37:51,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2022-01-31 21:37:51,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808071856] [2022-01-31 21:37:51,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:37:51,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-01-31 21:37:51,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:37:51,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-01-31 21:37:51,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=11565, Unknown=0, NotChecked=0, Total=11990 [2022-01-31 21:37:51,108 INFO L87 Difference]: Start difference. First operand 215 states and 218 transitions. Second operand has 107 states, 106 states have (on average 1.971698113207547) internal successors, (209), 105 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:01,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:01,596 INFO L93 Difference]: Finished difference Result 224 states and 229 transitions. [2022-01-31 21:38:01,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2022-01-31 21:38:01,597 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 106 states have (on average 1.971698113207547) internal successors, (209), 105 states have internal predecessors, (209), 2 states have call successors, (3), 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 213 [2022-01-31 21:38:01,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:01,598 INFO L225 Difference]: With dead ends: 224 [2022-01-31 21:38:01,598 INFO L226 Difference]: Without dead ends: 217 [2022-01-31 21:38:01,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6062 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1137, Invalid=43595, Unknown=0, NotChecked=0, Total=44732 [2022-01-31 21:38:01,600 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 209 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 21333 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 21540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 21333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:01,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 393 Invalid, 21540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 21333 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-01-31 21:38:01,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-01-31 21:38:01,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2022-01-31 21:38:01,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.0188679245283019) internal successors, (216), 212 states have internal predecessors, (216), 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 21:38:01,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 220 transitions. [2022-01-31 21:38:01,618 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 220 transitions. Word has length 213 [2022-01-31 21:38:01,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:01,618 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 220 transitions. [2022-01-31 21:38:01,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 106 states have (on average 1.971698113207547) internal successors, (209), 105 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:01,618 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 220 transitions. [2022-01-31 21:38:01,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2022-01-31 21:38:01,619 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:01,619 INFO L514 BasicCegarLoop]: trace histogram [102, 100, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:01,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2022-01-31 21:38:01,619 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:01,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:01,619 INFO L85 PathProgramCache]: Analyzing trace with hash 2130302281, now seen corresponding path program 100 times [2022-01-31 21:38:01,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:01,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002222419] [2022-01-31 21:38:01,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:01,661 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:01,675 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:01,676 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:01,690 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:01,730 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:01,730 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:01,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:01,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:01,774 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:01,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:01,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:06,176 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:06,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002222419] [2022-01-31 21:38:06,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2002222419] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:06,176 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:06,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2022-01-31 21:38:06,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796733521] [2022-01-31 21:38:06,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:06,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-01-31 21:38:06,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:06,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-01-31 21:38:06,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=11781, Unknown=0, NotChecked=0, Total=12210 [2022-01-31 21:38:06,177 INFO L87 Difference]: Start difference. First operand 217 states and 220 transitions. Second operand has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:16,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:16,762 INFO L93 Difference]: Finished difference Result 226 states and 231 transitions. [2022-01-31 21:38:16,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-01-31 21:38:16,762 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 2 states have call successors, (3), 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 215 [2022-01-31 21:38:16,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:16,763 INFO L225 Difference]: With dead ends: 226 [2022-01-31 21:38:16,763 INFO L226 Difference]: Without dead ends: 219 [2022-01-31 21:38:16,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6173 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=1148, Invalid=44434, Unknown=0, NotChecked=0, Total=45582 [2022-01-31 21:38:16,765 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 211 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 21058 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 21267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 21058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:16,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 83 Invalid, 21267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 21058 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-01-31 21:38:16,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-01-31 21:38:16,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2022-01-31 21:38:16,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 214 states have (on average 1.0186915887850467) internal successors, (218), 214 states have internal predecessors, (218), 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 21:38:16,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 222 transitions. [2022-01-31 21:38:16,777 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 222 transitions. Word has length 215 [2022-01-31 21:38:16,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:16,777 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 222 transitions. [2022-01-31 21:38:16,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 107 states have (on average 1.97196261682243) internal successors, (211), 106 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:16,778 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 222 transitions. [2022-01-31 21:38:16,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2022-01-31 21:38:16,778 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:16,778 INFO L514 BasicCegarLoop]: trace histogram [103, 101, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:16,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102 [2022-01-31 21:38:16,778 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:16,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:16,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1242475292, now seen corresponding path program 101 times [2022-01-31 21:38:16,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:16,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817122858] [2022-01-31 21:38:16,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:16,820 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:16,839 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:16,839 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:16,854 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:16,895 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:16,895 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:16,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:16,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:16,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:16,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:16,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:21,453 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:21,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817122858] [2022-01-31 21:38:21,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1817122858] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:21,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:21,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2022-01-31 21:38:21,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066140879] [2022-01-31 21:38:21,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:21,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-01-31 21:38:21,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:21,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-01-31 21:38:21,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=11999, Unknown=0, NotChecked=0, Total=12432 [2022-01-31 21:38:21,455 INFO L87 Difference]: Start difference. First operand 219 states and 222 transitions. Second operand has 109 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 107 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:32,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:32,307 INFO L93 Difference]: Finished difference Result 228 states and 233 transitions. [2022-01-31 21:38:32,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-01-31 21:38:32,307 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 107 states have internal predecessors, (213), 2 states have call successors, (3), 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 217 [2022-01-31 21:38:32,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:32,308 INFO L225 Difference]: With dead ends: 228 [2022-01-31 21:38:32,308 INFO L226 Difference]: Without dead ends: 221 [2022-01-31 21:38:32,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6285 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1159, Invalid=45281, Unknown=0, NotChecked=0, Total=46440 [2022-01-31 21:38:32,309 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 213 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 21711 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 21922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 21711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:32,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 193 Invalid, 21922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 21711 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-01-31 21:38:32,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-01-31 21:38:32,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2022-01-31 21:38:32,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 216 states have (on average 1.0185185185185186) internal successors, (220), 216 states have internal predecessors, (220), 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 21:38:32,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 224 transitions. [2022-01-31 21:38:32,321 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 224 transitions. Word has length 217 [2022-01-31 21:38:32,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:32,322 INFO L470 AbstractCegarLoop]: Abstraction has 221 states and 224 transitions. [2022-01-31 21:38:32,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 107 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:32,322 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 224 transitions. [2022-01-31 21:38:32,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2022-01-31 21:38:32,322 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:32,322 INFO L514 BasicCegarLoop]: trace histogram [104, 102, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:32,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2022-01-31 21:38:32,323 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:32,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:32,323 INFO L85 PathProgramCache]: Analyzing trace with hash 218585535, now seen corresponding path program 102 times [2022-01-31 21:38:32,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:32,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663022316] [2022-01-31 21:38:32,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:32,364 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:32,385 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:32,385 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:32,400 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:32,430 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:32,431 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:32,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:32,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:32,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:32,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:32,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:37,117 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:37,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663022316] [2022-01-31 21:38:37,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1663022316] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:37,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:37,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2022-01-31 21:38:37,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937381202] [2022-01-31 21:38:37,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:37,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-01-31 21:38:37,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:37,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-01-31 21:38:37,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=12219, Unknown=0, NotChecked=0, Total=12656 [2022-01-31 21:38:37,119 INFO L87 Difference]: Start difference. First operand 221 states and 224 transitions. Second operand has 110 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:48,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:38:48,059 INFO L93 Difference]: Finished difference Result 230 states and 235 transitions. [2022-01-31 21:38:48,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-01-31 21:38:48,060 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 2 states have call successors, (3), 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 219 [2022-01-31 21:38:48,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:38:48,060 INFO L225 Difference]: With dead ends: 230 [2022-01-31 21:38:48,060 INFO L226 Difference]: Without dead ends: 223 [2022-01-31 21:38:48,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 108 SyntacticMatches, 1 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6398 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=1170, Invalid=46136, Unknown=0, NotChecked=0, Total=47306 [2022-01-31 21:38:48,063 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 215 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 21673 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 21886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 21673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:38:48,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 78 Invalid, 21886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 21673 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-01-31 21:38:48,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-01-31 21:38:48,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2022-01-31 21:38:48,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 218 states have (on average 1.018348623853211) internal successors, (222), 218 states have internal predecessors, (222), 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 21:38:48,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 226 transitions. [2022-01-31 21:38:48,075 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 226 transitions. Word has length 219 [2022-01-31 21:38:48,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:38:48,075 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 226 transitions. [2022-01-31 21:38:48,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 109 states have (on average 1.9724770642201834) internal successors, (215), 108 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:38:48,076 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 226 transitions. [2022-01-31 21:38:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2022-01-31 21:38:48,076 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:38:48,076 INFO L514 BasicCegarLoop]: trace histogram [105, 103, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:38:48,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2022-01-31 21:38:48,076 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:38:48,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:38:48,077 INFO L85 PathProgramCache]: Analyzing trace with hash -156265510, now seen corresponding path program 103 times [2022-01-31 21:38:48,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:38:48,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225074675] [2022-01-31 21:38:48,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:38:48,118 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:48,139 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:48,139 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:48,154 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:48,190 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:38:48,190 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:38:48,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:38:48,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:48,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:38:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:38:48,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:38:52,913 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:38:52,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225074675] [2022-01-31 21:38:52,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225074675] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:38:52,913 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:38:52,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2022-01-31 21:38:52,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579435569] [2022-01-31 21:38:52,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:38:52,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-01-31 21:38:52,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:38:52,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-01-31 21:38:52,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=12441, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:38:52,914 INFO L87 Difference]: Start difference. First operand 223 states and 226 transitions. Second operand has 111 states, 110 states have (on average 1.9727272727272727) internal successors, (217), 109 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:04,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:04,192 INFO L93 Difference]: Finished difference Result 232 states and 237 transitions. [2022-01-31 21:39:04,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-01-31 21:39:04,192 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 110 states have (on average 1.9727272727272727) internal successors, (217), 109 states have internal predecessors, (217), 2 states have call successors, (3), 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 221 [2022-01-31 21:39:04,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:04,193 INFO L225 Difference]: With dead ends: 232 [2022-01-31 21:39:04,193 INFO L226 Difference]: Without dead ends: 225 [2022-01-31 21:39:04,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6512 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=1181, Invalid=46999, Unknown=0, NotChecked=0, Total=48180 [2022-01-31 21:39:04,195 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 217 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 22732 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 22947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 22732 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:04,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 278 Invalid, 22947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 22732 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-01-31 21:39:04,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-01-31 21:39:04,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 225. [2022-01-31 21:39:04,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 220 states have (on average 1.018181818181818) internal successors, (224), 220 states have internal predecessors, (224), 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 21:39:04,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 228 transitions. [2022-01-31 21:39:04,208 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 228 transitions. Word has length 221 [2022-01-31 21:39:04,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:04,208 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 228 transitions. [2022-01-31 21:39:04,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 110 states have (on average 1.9727272727272727) internal successors, (217), 109 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:04,208 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 228 transitions. [2022-01-31 21:39:04,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2022-01-31 21:39:04,209 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:04,209 INFO L514 BasicCegarLoop]: trace histogram [106, 104, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:04,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105 [2022-01-31 21:39:04,209 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:04,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:04,209 INFO L85 PathProgramCache]: Analyzing trace with hash 389133109, now seen corresponding path program 104 times [2022-01-31 21:39:04,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:04,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690313088] [2022-01-31 21:39:04,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:04,249 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:04,269 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:04,269 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:04,289 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:04,329 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:04,329 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:04,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:04,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:04,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:04,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:04,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:09,139 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:09,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690313088] [2022-01-31 21:39:09,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [690313088] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:09,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:09,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2022-01-31 21:39:09,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370062854] [2022-01-31 21:39:09,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:09,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-01-31 21:39:09,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:09,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-01-31 21:39:09,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=12665, Unknown=0, NotChecked=0, Total=13110 [2022-01-31 21:39:09,141 INFO L87 Difference]: Start difference. First operand 225 states and 228 transitions. Second operand has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:20,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:20,474 INFO L93 Difference]: Finished difference Result 234 states and 239 transitions. [2022-01-31 21:39:20,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-01-31 21:39:20,474 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 2 states have call successors, (3), 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 223 [2022-01-31 21:39:20,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:20,474 INFO L225 Difference]: With dead ends: 234 [2022-01-31 21:39:20,475 INFO L226 Difference]: Without dead ends: 227 [2022-01-31 21:39:20,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6627 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=1192, Invalid=47870, Unknown=0, NotChecked=0, Total=49062 [2022-01-31 21:39:20,477 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 219 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 22522 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 22739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 22522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:20,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 83 Invalid, 22739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 22522 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-01-31 21:39:20,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-01-31 21:39:20,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2022-01-31 21:39:20,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 222 states have (on average 1.018018018018018) internal successors, (226), 222 states have internal predecessors, (226), 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 21:39:20,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 230 transitions. [2022-01-31 21:39:20,489 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 230 transitions. Word has length 223 [2022-01-31 21:39:20,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:20,490 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 230 transitions. [2022-01-31 21:39:20,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 111 states have (on average 1.972972972972973) internal successors, (219), 110 states have internal predecessors, (219), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:20,490 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 230 transitions. [2022-01-31 21:39:20,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2022-01-31 21:39:20,490 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:20,490 INFO L514 BasicCegarLoop]: trace histogram [107, 105, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:20,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2022-01-31 21:39:20,491 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:20,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:20,491 INFO L85 PathProgramCache]: Analyzing trace with hash 531195856, now seen corresponding path program 105 times [2022-01-31 21:39:20,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:20,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82452078] [2022-01-31 21:39:20,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:20,530 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:20,546 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:20,546 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:20,561 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:20,591 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:20,591 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:20,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:20,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:20,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:20,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:20,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:25,498 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:25,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82452078] [2022-01-31 21:39:25,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [82452078] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:25,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:25,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [113] imperfect sequences [] total 113 [2022-01-31 21:39:25,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407222170] [2022-01-31 21:39:25,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:25,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-01-31 21:39:25,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:25,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-01-31 21:39:25,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=12891, Unknown=0, NotChecked=0, Total=13340 [2022-01-31 21:39:25,500 INFO L87 Difference]: Start difference. First operand 227 states and 230 transitions. Second operand has 113 states, 112 states have (on average 1.9732142857142858) internal successors, (221), 111 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:37,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:37,094 INFO L93 Difference]: Finished difference Result 236 states and 241 transitions. [2022-01-31 21:39:37,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2022-01-31 21:39:37,094 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 112 states have (on average 1.9732142857142858) internal successors, (221), 111 states have internal predecessors, (221), 2 states have call successors, (3), 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 225 [2022-01-31 21:39:37,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:37,095 INFO L225 Difference]: With dead ends: 236 [2022-01-31 21:39:37,095 INFO L226 Difference]: Without dead ends: 229 [2022-01-31 21:39:37,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6743 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=1203, Invalid=48749, Unknown=0, NotChecked=0, Total=49952 [2022-01-31 21:39:37,097 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 221 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 23274 mSolverCounterSat, 219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 23493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 219 IncrementalHoareTripleChecker+Valid, 23274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:37,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 138 Invalid, 23493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [219 Valid, 23274 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-01-31 21:39:37,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-01-31 21:39:37,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2022-01-31 21:39:37,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 224 states have (on average 1.0178571428571428) internal successors, (228), 224 states have internal predecessors, (228), 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 21:39:37,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 232 transitions. [2022-01-31 21:39:37,116 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 232 transitions. Word has length 225 [2022-01-31 21:39:37,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:37,116 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 232 transitions. [2022-01-31 21:39:37,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 112 states have (on average 1.9732142857142858) internal successors, (221), 111 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:37,117 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 232 transitions. [2022-01-31 21:39:37,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2022-01-31 21:39:37,117 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:37,117 INFO L514 BasicCegarLoop]: trace histogram [108, 106, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:37,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2022-01-31 21:39:37,117 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:37,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:37,118 INFO L85 PathProgramCache]: Analyzing trace with hash -385457749, now seen corresponding path program 106 times [2022-01-31 21:39:37,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:37,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958866106] [2022-01-31 21:39:37,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:37,149 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,168 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,168 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:37,189 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,218 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:37,219 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:37,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:37,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:37,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:37,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:37,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:42,221 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:42,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958866106] [2022-01-31 21:39:42,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [958866106] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:42,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:42,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2022-01-31 21:39:42,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167180926] [2022-01-31 21:39:42,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:42,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-01-31 21:39:42,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:42,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-01-31 21:39:42,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=453, Invalid=13119, Unknown=0, NotChecked=0, Total=13572 [2022-01-31 21:39:42,223 INFO L87 Difference]: Start difference. First operand 229 states and 232 transitions. Second operand has 114 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:54,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:39:54,300 INFO L93 Difference]: Finished difference Result 238 states and 243 transitions. [2022-01-31 21:39:54,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-01-31 21:39:54,301 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 2 states have call successors, (3), 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 227 [2022-01-31 21:39:54,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:39:54,301 INFO L225 Difference]: With dead ends: 238 [2022-01-31 21:39:54,301 INFO L226 Difference]: Without dead ends: 231 [2022-01-31 21:39:54,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6860 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=1214, Invalid=49636, Unknown=0, NotChecked=0, Total=50850 [2022-01-31 21:39:54,303 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 223 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 24530 mSolverCounterSat, 221 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 513 SdHoareTripleChecker+Invalid, 24751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 221 IncrementalHoareTripleChecker+Valid, 24530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:39:54,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 513 Invalid, 24751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [221 Valid, 24530 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2022-01-31 21:39:54,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-01-31 21:39:54,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2022-01-31 21:39:54,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 226 states have (on average 1.0176991150442478) internal successors, (230), 226 states have internal predecessors, (230), 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 21:39:54,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 234 transitions. [2022-01-31 21:39:54,316 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 234 transitions. Word has length 227 [2022-01-31 21:39:54,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:39:54,316 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 234 transitions. [2022-01-31 21:39:54,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 113 states have (on average 1.9734513274336283) internal successors, (223), 112 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:39:54,316 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 234 transitions. [2022-01-31 21:39:54,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2022-01-31 21:39:54,317 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:39:54,317 INFO L514 BasicCegarLoop]: trace histogram [109, 107, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:39:54,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108 [2022-01-31 21:39:54,317 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:39:54,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:39:54,317 INFO L85 PathProgramCache]: Analyzing trace with hash -821276474, now seen corresponding path program 107 times [2022-01-31 21:39:54,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:39:54,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774609166] [2022-01-31 21:39:54,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:39:54,359 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:54,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:54,378 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:54,399 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:54,438 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:39:54,438 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:39:54,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:39:54,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:54,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:39:54,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:39:54,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:39:59,455 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:39:59,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774609166] [2022-01-31 21:39:59,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [774609166] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:39:59,455 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:39:59,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [115] imperfect sequences [] total 115 [2022-01-31 21:39:59,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151101607] [2022-01-31 21:39:59,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:39:59,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-01-31 21:39:59,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:39:59,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-01-31 21:39:59,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=13349, Unknown=0, NotChecked=0, Total=13806 [2022-01-31 21:39:59,457 INFO L87 Difference]: Start difference. First operand 231 states and 234 transitions. Second operand has 115 states, 114 states have (on average 1.9736842105263157) internal successors, (225), 113 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:40:11,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:40:11,658 INFO L93 Difference]: Finished difference Result 240 states and 245 transitions. [2022-01-31 21:40:11,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-01-31 21:40:11,659 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 114 states have (on average 1.9736842105263157) internal successors, (225), 113 states have internal predecessors, (225), 2 states have call successors, (3), 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 229 [2022-01-31 21:40:11,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:40:11,659 INFO L225 Difference]: With dead ends: 240 [2022-01-31 21:40:11,659 INFO L226 Difference]: Without dead ends: 233 [2022-01-31 21:40:11,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6978 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=1225, Invalid=50531, Unknown=0, NotChecked=0, Total=51756 [2022-01-31 21:40:11,662 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 225 mSDsluCounter, 512 mSDsCounter, 0 mSdLazyCounter, 24777 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 25000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 24777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:40:11,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 523 Invalid, 25000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 24777 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2022-01-31 21:40:11,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-01-31 21:40:11,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2022-01-31 21:40:11,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.0175438596491229) internal successors, (232), 228 states have internal predecessors, (232), 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 21:40:11,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 236 transitions. [2022-01-31 21:40:11,694 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 236 transitions. Word has length 229 [2022-01-31 21:40:11,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:40:11,695 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 236 transitions. [2022-01-31 21:40:11,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 114 states have (on average 1.9736842105263157) internal successors, (225), 113 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:40:11,695 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 236 transitions. [2022-01-31 21:40:11,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2022-01-31 21:40:11,695 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:40:11,695 INFO L514 BasicCegarLoop]: trace histogram [110, 108, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:40:11,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2022-01-31 21:40:11,696 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:40:11,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:40:11,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1263723809, now seen corresponding path program 108 times [2022-01-31 21:40:11,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:40:11,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056899879] [2022-01-31 21:40:11,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:40:11,726 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:11,741 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:11,741 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:11,755 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:11,796 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:40:11,796 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:40:11,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:40:11,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:11,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:40:11,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:40:11,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:40:16,981 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:40:16,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056899879] [2022-01-31 21:40:16,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1056899879] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:40:16,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:40:16,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2022-01-31 21:40:16,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023554275] [2022-01-31 21:40:16,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:40:16,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-01-31 21:40:16,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:40:16,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-01-31 21:40:16,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=13581, Unknown=0, NotChecked=0, Total=14042 [2022-01-31 21:40:16,983 INFO L87 Difference]: Start difference. First operand 233 states and 236 transitions. Second operand has 116 states, 115 states have (on average 1.9739130434782608) internal successors, (227), 114 states have internal predecessors, (227), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)