/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_10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 21:19:20,066 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 21:19:20,068 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 21:19:20,126 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 21:19:20,170 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 21:19:20,170 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 21:19:20,171 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 21:19:20,175 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 21:19:20,186 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 21:19:20,186 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 21:19:20,187 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 21:19:20,187 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 21:19:20,187 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 21:19:20,187 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 21:19:20,188 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 21:19:20,188 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 21:19:20,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 21:19:20,188 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 21:19:20,189 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 21:19:20,189 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:19:20,190 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 21:19:20,190 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 21:19:20,190 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 21:19:20,190 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 21:19:20,190 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:19:20,381 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:19:20,400 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:19:20,402 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:19:20,403 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:19:20,404 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:19:20,405 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2022-01-31 21:19:20,463 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5676e202a/3a7b0f1f691c4299ba6e4821f9e48955/FLAGe71b97ae2 [2022-01-31 21:19:20,789 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:19:20,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2022-01-31 21:19:20,805 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5676e202a/3a7b0f1f691c4299ba6e4821f9e48955/FLAGe71b97ae2 [2022-01-31 21:19:20,821 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5676e202a/3a7b0f1f691c4299ba6e4821f9e48955 [2022-01-31 21:19:20,823 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:19:20,825 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:19:20,829 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:19:20,829 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:19:20,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:19:20,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:19:20" (1/1) ... [2022-01-31 21:19:20,834 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c042e82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:20, skipping insertion in model container [2022-01-31 21:19:20,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:19:20" (1/1) ... [2022-01-31 21:19:20,839 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:19:20,849 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:19:20,994 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_10.c[319,332] [2022-01-31 21:19:21,008 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:19:21,014 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:19:21,025 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_10.c[319,332] [2022-01-31 21:19:21,027 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:19:21,035 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:19:21,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21 WrapperNode [2022-01-31 21:19:21,036 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:19:21,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:19:21,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:19:21,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:19:21,043 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,043 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,049 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,049 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,053 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,055 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:19:21,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:19:21,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:19:21,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:19:21,066 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (1/1) ... [2022-01-31 21:19:21,075 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:19:21,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:19:21,091 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-01-31 21:19:21,092 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 21:19:21,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:19:21,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:19:21,120 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:19:21,120 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:19:21,120 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:19:21,120 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:19:21,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:19:21,121 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:19:21,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:19:21,121 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:19:21,121 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:19:21,173 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:19:21,174 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:19:21,249 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:19:21,254 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:19:21,254 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-01-31 21:19:21,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:19:21 BoogieIcfgContainer [2022-01-31 21:19:21,255 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:19:21,257 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:19:21,257 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:19:21,259 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:19:21,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:19:20" (1/3) ... [2022-01-31 21:19:21,260 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469f1d19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:19:21, skipping insertion in model container [2022-01-31 21:19:21,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:19:21" (2/3) ... [2022-01-31 21:19:21,260 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469f1d19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:19:21, skipping insertion in model container [2022-01-31 21:19:21,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:19:21" (3/3) ... [2022-01-31 21:19:21,261 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_10.c [2022-01-31 21:19:21,265 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:19:21,265 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:19:21,298 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:19:21,304 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 21:19:21,304 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:19:21,313 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 21:19:21,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:19:21,318 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:21,319 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:21,319 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:21,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:21,323 INFO L85 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2022-01-31 21:19:21,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:21,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439110598] [2022-01-31 21:19:21,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:21,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:21,416 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:19:21,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:21,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:21,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:21,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:21,527 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:21,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439110598] [2022-01-31 21:19:21,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [439110598] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:21,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:21,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:19:21,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198744335] [2022-01-31 21:19:21,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:21,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:19:21,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:21,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:19:21,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:19:21,565 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 21:19:21,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:21,614 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2022-01-31 21:19:21,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:19:21,617 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 21:19:21,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:21,622 INFO L225 Difference]: With dead ends: 33 [2022-01-31 21:19:21,622 INFO L226 Difference]: Without dead ends: 14 [2022-01-31 21:19:21,626 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 21:19:21,631 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 13 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:21,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 24 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:19:21,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-01-31 21:19:21,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-01-31 21:19:21,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:21,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-01-31 21:19:21,667 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-01-31 21:19:21,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:21,667 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-01-31 21:19:21,667 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 21:19:21,668 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-01-31 21:19:21,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:19:21,669 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:21,669 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:21,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:19:21,670 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:21,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:21,672 INFO L85 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2022-01-31 21:19:21,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:21,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040847081] [2022-01-31 21:19:21,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:21,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:21,682 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:19:21,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:21,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:21,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:21,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:21,851 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:21,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040847081] [2022-01-31 21:19:21,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1040847081] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:21,851 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:21,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:19:21,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050086636] [2022-01-31 21:19:21,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:21,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:19:21,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:21,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:19:21,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:19:21,853 INFO L87 Difference]: Start difference. First operand 14 states and 15 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 21:19:21,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:21,910 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-01-31 21:19:21,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:19:21,910 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 21:19:21,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:21,911 INFO L225 Difference]: With dead ends: 25 [2022-01-31 21:19:21,911 INFO L226 Difference]: Without dead ends: 17 [2022-01-31 21:19:21,912 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 21:19:21,913 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:21,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:19:21,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-01-31 21:19:21,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-01-31 21:19:21,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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 21:19:21,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-01-31 21:19:21,919 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-01-31 21:19:21,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:21,919 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-01-31 21:19:21,920 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 21:19:21,920 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-01-31 21:19:21,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-01-31 21:19:21,920 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:21,920 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:21,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:19:21,921 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:21,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:21,921 INFO L85 PathProgramCache]: Analyzing trace with hash -79339060, now seen corresponding path program 1 times [2022-01-31 21:19:21,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:21,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268895564] [2022-01-31 21:19:21,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:22,119 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:22,120 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:19:22,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:22,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:22,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:22,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:22,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:22,576 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:22,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268895564] [2022-01-31 21:19:22,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [268895564] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:22,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:22,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 21:19:22,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359792029] [2022-01-31 21:19:22,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:22,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 21:19:22,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:22,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 21:19:22,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-01-31 21:19:22,580 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:22,744 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-01-31 21:19:22,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 21:19:22,744 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-01-31 21:19:22,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:22,745 INFO L225 Difference]: With dead ends: 26 [2022-01-31 21:19:22,745 INFO L226 Difference]: Without dead ends: 21 [2022-01-31 21:19:22,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2022-01-31 21:19:22,747 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:22,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 28 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:19:22,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-01-31 21:19:22,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-01-31 21:19:22,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-01-31 21:19:22,754 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-01-31 21:19:22,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:22,754 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-01-31 21:19:22,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:22,754 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-01-31 21:19:22,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 21:19:22,755 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:22,755 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:22,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:19:22,757 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:22,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:22,758 INFO L85 PathProgramCache]: Analyzing trace with hash 309814626, now seen corresponding path program 1 times [2022-01-31 21:19:22,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:22,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072447636] [2022-01-31 21:19:22,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:22,996 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:22,996 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:19:23,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:23,297 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:23,298 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:23,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:23,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:23,727 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:23,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:23,740 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 21:19:24,097 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:24,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072447636] [2022-01-31 21:19:24,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1072447636] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:24,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:24,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 21:19:24,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785500287] [2022-01-31 21:19:24,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:24,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 21:19:24,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:24,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 21:19:24,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:19:24,100 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:24,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:24,411 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2022-01-31 21:19:24,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:19:24,411 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-01-31 21:19:24,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:24,412 INFO L225 Difference]: With dead ends: 31 [2022-01-31 21:19:24,412 INFO L226 Difference]: Without dead ends: 23 [2022-01-31 21:19:24,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:19:24,414 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:24,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 48 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:19:24,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-01-31 21:19:24,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-01-31 21:19:24,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 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 21:19:24,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-01-31 21:19:24,422 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2022-01-31 21:19:24,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:24,422 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-01-31 21:19:24,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:24,422 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-01-31 21:19:24,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-01-31 21:19:24,423 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:24,423 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:24,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:19:24,423 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:24,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:24,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1470542348, now seen corresponding path program 2 times [2022-01-31 21:19:24,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:24,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790377543] [2022-01-31 21:19:24,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:24,617 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:24,795 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:24,795 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:24,878 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:24,988 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:24,989 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:24,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:25,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:25,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:25,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:25,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:25,866 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:25,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790377543] [2022-01-31 21:19:25,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [790377543] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:25,867 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:25,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:19:25,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28536518] [2022-01-31 21:19:25,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:25,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:19:25,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:25,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:19:25,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:19:25,868 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:26,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:26,245 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-01-31 21:19:26,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:19:26,245 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-01-31 21:19:26,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:26,246 INFO L225 Difference]: With dead ends: 34 [2022-01-31 21:19:26,246 INFO L226 Difference]: Without dead ends: 26 [2022-01-31 21:19:26,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:19:26,248 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:26,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 43 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:19:26,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-01-31 21:19:26,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-01-31 21:19:26,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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 21:19:26,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-01-31 21:19:26,256 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2022-01-31 21:19:26,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:26,256 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-01-31 21:19:26,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-01-31 21:19:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 21:19:26,257 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:26,257 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:26,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:19:26,258 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:26,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:26,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1928408354, now seen corresponding path program 3 times [2022-01-31 21:19:26,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:26,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679439036] [2022-01-31 21:19:26,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:26,455 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:26,728 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:26,728 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:26,818 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:26,917 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:26,918 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:26,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:26,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:27,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:27,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:27,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:27,782 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:27,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679439036] [2022-01-31 21:19:27,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1679439036] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:27,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:27,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-01-31 21:19:27,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524600726] [2022-01-31 21:19:27,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:27,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-31 21:19:27,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:27,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-31 21:19:27,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:19:27,784 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 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 21:19:28,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:28,321 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-01-31 21:19:28,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:19:28,321 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 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 21:19:28,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:28,322 INFO L225 Difference]: With dead ends: 37 [2022-01-31 21:19:28,322 INFO L226 Difference]: Without dead ends: 29 [2022-01-31 21:19:28,322 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:19:28,323 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 23 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:28,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 58 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:19:28,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-31 21:19:28,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-01-31 21:19:28,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 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 21:19:28,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-01-31 21:19:28,338 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2022-01-31 21:19:28,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:28,338 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-01-31 21:19:28,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 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 21:19:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-01-31 21:19:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-01-31 21:19:28,339 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:28,339 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:28,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:19:28,339 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:28,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:28,339 INFO L85 PathProgramCache]: Analyzing trace with hash 1398461004, now seen corresponding path program 4 times [2022-01-31 21:19:28,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:28,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106387350] [2022-01-31 21:19:28,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:28,486 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:28,601 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:28,601 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:28,700 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:28,784 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:28,785 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:28,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:28,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:29,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:29,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:29,024 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 21:19:29,729 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:29,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106387350] [2022-01-31 21:19:29,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [106387350] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:29,730 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:29,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:19:29,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662315483] [2022-01-31 21:19:29,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:29,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:19:29,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:29,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:19:29,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:19:29,731 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:30,329 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2022-01-31 21:19:30,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:19:30,330 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-01-31 21:19:30,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:30,330 INFO L225 Difference]: With dead ends: 40 [2022-01-31 21:19:30,330 INFO L226 Difference]: Without dead ends: 32 [2022-01-31 21:19:30,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:19:30,332 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:30,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 78 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:19:30,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-01-31 21:19:30,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2022-01-31 21:19:30,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 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 21:19:30,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-01-31 21:19:30,341 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 26 [2022-01-31 21:19:30,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:30,341 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-01-31 21:19:30,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:30,342 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-01-31 21:19:30,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-31 21:19:30,342 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:30,342 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:30,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:19:30,343 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:30,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:30,343 INFO L85 PathProgramCache]: Analyzing trace with hash 2036737250, now seen corresponding path program 5 times [2022-01-31 21:19:30,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:30,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822169504] [2022-01-31 21:19:30,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:30,489 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,794 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,795 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,888 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,973 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:30,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:30,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:31,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:31,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:31,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:31,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:32,255 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:32,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822169504] [2022-01-31 21:19:32,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [822169504] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:32,255 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:32,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:19:32,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160848072] [2022-01-31 21:19:32,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:32,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:19:32,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:32,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:19:32,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:19:32,257 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 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 21:19:32,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:32,914 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2022-01-31 21:19:32,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:19:32,914 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 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 21:19:32,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:32,915 INFO L225 Difference]: With dead ends: 43 [2022-01-31 21:19:32,915 INFO L226 Difference]: Without dead ends: 35 [2022-01-31 21:19:32,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:19:32,916 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 28 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:32,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 68 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:19:32,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-01-31 21:19:32,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-01-31 21:19:32,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 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 21:19:32,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-01-31 21:19:32,925 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2022-01-31 21:19:32,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:32,925 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-01-31 21:19:32,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 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 21:19:32,926 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-01-31 21:19:32,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-01-31 21:19:32,926 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:32,926 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:32,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:19:32,927 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:32,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:32,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1190804852, now seen corresponding path program 6 times [2022-01-31 21:19:32,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:32,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072567021] [2022-01-31 21:19:32,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:33,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,199 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,199 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:33,264 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,363 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:33,363 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:33,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:33,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:33,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:33,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:33,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:34,669 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:34,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072567021] [2022-01-31 21:19:34,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1072567021] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:34,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:34,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:19:34,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162149575] [2022-01-31 21:19:34,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:34,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:19:34,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:34,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:19:34,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:19:34,671 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:35,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:35,629 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-01-31 21:19:35,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:19:35,630 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-01-31 21:19:35,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:35,631 INFO L225 Difference]: With dead ends: 46 [2022-01-31 21:19:35,631 INFO L226 Difference]: Without dead ends: 38 [2022-01-31 21:19:35,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=157, Invalid=1325, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:19:35,632 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:35,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 93 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:19:35,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-01-31 21:19:35,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-01-31 21:19:35,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 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 21:19:35,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-01-31 21:19:35,641 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2022-01-31 21:19:35,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:35,642 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-01-31 21:19:35,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:35,642 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-01-31 21:19:35,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-01-31 21:19:35,643 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:35,643 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:35,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:19:35,643 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:35,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:35,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1464709982, now seen corresponding path program 7 times [2022-01-31 21:19:35,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:35,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170104984] [2022-01-31 21:19:35,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:35,784 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:35,949 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:35,949 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:36,058 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:36,143 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:36,143 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:36,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:36,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:36,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:36,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:37,531 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:37,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170104984] [2022-01-31 21:19:37,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [170104984] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:37,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:37,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:19:37,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235155087] [2022-01-31 21:19:37,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:37,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:19:37,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:37,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:19:37,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:19:37,533 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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 21:19:38,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:38,566 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2022-01-31 21:19:38,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:19:38,567 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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 21:19:38,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:38,568 INFO L225 Difference]: With dead ends: 49 [2022-01-31 21:19:38,568 INFO L226 Difference]: Without dead ends: 41 [2022-01-31 21:19:38,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=172, Invalid=1634, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:19:38,570 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:38,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 113 Invalid, 690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:38,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-01-31 21:19:38,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2022-01-31 21:19:38,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 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 21:19:38,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-01-31 21:19:38,581 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2022-01-31 21:19:38,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:38,581 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-01-31 21:19:38,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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 21:19:38,581 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-01-31 21:19:38,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-01-31 21:19:38,582 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:38,582 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:38,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:19:38,582 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:38,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:38,582 INFO L85 PathProgramCache]: Analyzing trace with hash -934575412, now seen corresponding path program 8 times [2022-01-31 21:19:38,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:38,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909896005] [2022-01-31 21:19:38,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:38,755 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:38,860 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:38,860 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:38,940 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:39,484 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:39,485 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:39,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:39,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:39,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:39,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:41,092 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:41,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909896005] [2022-01-31 21:19:41,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [909896005] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:41,093 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:41,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:19:41,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506556116] [2022-01-31 21:19:41,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:41,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:19:41,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:41,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:19:41,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:19:41,094 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:42,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:42,262 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2022-01-31 21:19:42,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:19:42,262 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-01-31 21:19:42,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:42,262 INFO L225 Difference]: With dead ends: 52 [2022-01-31 21:19:42,263 INFO L226 Difference]: Without dead ends: 44 [2022-01-31 21:19:42,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 4 SyntacticMatches, 9 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=188, Invalid=1974, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:19:42,264 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 34 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:42,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 585 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:19:42,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-01-31 21:19:42,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-01-31 21:19:42,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 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 21:19:42,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-01-31 21:19:42,274 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2022-01-31 21:19:42,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:42,274 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-01-31 21:19:42,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:42,274 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-01-31 21:19:42,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-31 21:19:42,275 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:42,275 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:42,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:19:42,275 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:42,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:42,276 INFO L85 PathProgramCache]: Analyzing trace with hash -290347934, now seen corresponding path program 9 times [2022-01-31 21:19:42,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:42,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978913019] [2022-01-31 21:19:42,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:42,428 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:42,597 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:42,597 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:42,680 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:42,817 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:42,817 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:42,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:42,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:43,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:43,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:43,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:44,927 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:44,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978913019] [2022-01-31 21:19:44,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [978913019] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:44,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:44,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:19:44,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076838778] [2022-01-31 21:19:44,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:44,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:19:44,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:44,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:19:44,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=773, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:19:44,928 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 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 21:19:46,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:46,435 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2022-01-31 21:19:46,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:19:46,435 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 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 21:19:46,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:46,436 INFO L225 Difference]: With dead ends: 55 [2022-01-31 21:19:46,436 INFO L226 Difference]: Without dead ends: 47 [2022-01-31 21:19:46,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 4 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=220, Invalid=2330, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:19:46,437 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:46,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 88 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:19:46,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-01-31 21:19:46,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2022-01-31 21:19:46,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 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 21:19:46,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-01-31 21:19:46,448 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2022-01-31 21:19:46,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:46,448 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-01-31 21:19:46,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 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 21:19:46,448 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-01-31 21:19:46,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-01-31 21:19:46,449 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:46,449 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:46,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:19:46,449 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:46,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:46,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1976570636, now seen corresponding path program 10 times [2022-01-31 21:19:46,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:46,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267574994] [2022-01-31 21:19:46,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:46,586 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:46,693 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:46,693 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:46,788 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:46,981 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:46,981 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:46,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:46,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:47,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:47,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:47,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:49,028 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:49,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267574994] [2022-01-31 21:19:49,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1267574994] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:49,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:49,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:19:49,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558834154] [2022-01-31 21:19:49,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:49,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:19:49,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:49,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:19:49,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=896, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:19:49,030 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:50,773 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2022-01-31 21:19:50,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:19:50,773 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-01-31 21:19:50,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:50,774 INFO L225 Difference]: With dead ends: 58 [2022-01-31 21:19:50,774 INFO L226 Difference]: Without dead ends: 50 [2022-01-31 21:19:50,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 4 SyntacticMatches, 11 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=222, Invalid=2748, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:19:50,775 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:50,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 98 Invalid, 924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 886 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:19:50,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-01-31 21:19:50,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-01-31 21:19:50,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 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 21:19:50,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-01-31 21:19:50,787 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2022-01-31 21:19:50,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:50,787 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-01-31 21:19:50,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:19:50,787 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-01-31 21:19:50,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 21:19:50,788 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:50,788 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:50,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:19:50,788 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:50,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:50,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1681927202, now seen corresponding path program 11 times [2022-01-31 21:19:50,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:50,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404345467] [2022-01-31 21:19:50,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:50,963 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,079 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,079 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:51,153 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,221 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:51,221 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:51,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:51,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:51,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:51,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:51,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:53,639 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:53,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404345467] [2022-01-31 21:19:53,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [404345467] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:53,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:53,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:19:53,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596934068] [2022-01-31 21:19:53,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:53,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:19:53,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:53,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:19:53,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1020, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:19:53,641 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 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 21:19:55,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:19:55,793 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-01-31 21:19:55,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:19:55,793 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 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 21:19:55,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:19:55,794 INFO L225 Difference]: With dead ends: 61 [2022-01-31 21:19:55,794 INFO L226 Difference]: Without dead ends: 53 [2022-01-31 21:19:55,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 4 SyntacticMatches, 12 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 864 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=237, Invalid=3185, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:19:55,795 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:19:55,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 148 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1237 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:19:55,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-01-31 21:19:55,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-01-31 21:19:55,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 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 21:19:55,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-01-31 21:19:55,807 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2022-01-31 21:19:55,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:19:55,808 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-01-31 21:19:55,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 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 21:19:55,808 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-01-31 21:19:55,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-01-31 21:19:55,809 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:19:55,809 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:19:55,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:19:55,809 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:19:55,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:19:55,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1422429364, now seen corresponding path program 12 times [2022-01-31 21:19:55,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:19:55,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194946916] [2022-01-31 21:19:55,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:19:55,999 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:56,142 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:56,143 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:56,246 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:56,316 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:19:56,316 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:19:56,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:19:56,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:56,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:19:56,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:19:56,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:19:58,806 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:19:58,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194946916] [2022-01-31 21:19:58,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [194946916] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:19:58,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:19:58,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:19:58,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687108613] [2022-01-31 21:19:58,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:19:58,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:19:58,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:19:58,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:19:58,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1153, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:19:58,807 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:01,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:01,024 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2022-01-31 21:20:01,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:20:01,025 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-01-31 21:20:01,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:01,025 INFO L225 Difference]: With dead ends: 64 [2022-01-31 21:20:01,025 INFO L226 Difference]: Without dead ends: 56 [2022-01-31 21:20:01,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=252, Invalid=3654, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:20:01,027 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 41 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:01,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 108 Invalid, 1210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1166 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:20:01,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-01-31 21:20:01,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-01-31 21:20:01,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 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 21:20:01,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-01-31 21:20:01,039 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2022-01-31 21:20:01,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:01,039 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-01-31 21:20:01,040 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:01,040 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-01-31 21:20:01,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:20:01,040 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:01,040 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:01,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:20:01,041 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:01,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:01,041 INFO L85 PathProgramCache]: Analyzing trace with hash 221897698, now seen corresponding path program 13 times [2022-01-31 21:20:01,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:01,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980581056] [2022-01-31 21:20:01,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:01,192 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:01,302 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:01,303 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:01,384 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:01,463 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:01,463 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:01,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:01,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:01,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:01,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:01,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:04,329 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:04,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980581056] [2022-01-31 21:20:04,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [980581056] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:04,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:04,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:20:04,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924830963] [2022-01-31 21:20:04,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:04,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:20:04,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:04,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:20:04,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1292, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:20:04,331 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 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 21:20:06,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:06,504 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2022-01-31 21:20:06,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:20:06,504 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 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 21:20:06,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:06,505 INFO L225 Difference]: With dead ends: 67 [2022-01-31 21:20:06,505 INFO L226 Difference]: Without dead ends: 59 [2022-01-31 21:20:06,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 4 SyntacticMatches, 14 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=270, Invalid=4152, Unknown=0, NotChecked=0, Total=4422 [2022-01-31 21:20:06,506 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 43 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 1368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:06,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 113 Invalid, 1368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1321 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:20:06,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-01-31 21:20:06,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2022-01-31 21:20:06,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 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 21:20:06,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2022-01-31 21:20:06,523 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2022-01-31 21:20:06,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:06,523 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2022-01-31 21:20:06,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 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 21:20:06,524 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2022-01-31 21:20:06,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-01-31 21:20:06,525 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:06,525 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:06,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:20:06,525 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:06,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:06,525 INFO L85 PathProgramCache]: Analyzing trace with hash -2027576436, now seen corresponding path program 14 times [2022-01-31 21:20:06,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:06,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845417670] [2022-01-31 21:20:06,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:06,678 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:06,841 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:06,841 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:06,911 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:07,005 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:07,005 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:07,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:07,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:07,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:07,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:07,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:10,127 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:10,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845417670] [2022-01-31 21:20:10,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [845417670] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:10,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:10,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:20:10,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666702732] [2022-01-31 21:20:10,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:10,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:20:10,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:10,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:20:10,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1441, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:20:10,129 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:12,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:12,884 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2022-01-31 21:20:12,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:20:12,884 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2022-01-31 21:20:12,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:12,885 INFO L225 Difference]: With dead ends: 70 [2022-01-31 21:20:12,885 INFO L226 Difference]: Without dead ends: 62 [2022-01-31 21:20:12,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 4 SyntacticMatches, 15 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=284, Invalid=4686, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:20:12,886 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 45 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1675 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:12,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 153 Invalid, 1725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1675 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:20:12,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-01-31 21:20:12,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-01-31 21:20:12,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 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 21:20:12,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-01-31 21:20:12,896 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2022-01-31 21:20:12,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:12,896 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-01-31 21:20:12,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:12,896 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-01-31 21:20:12,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:20:12,896 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:12,897 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:12,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:20:12,897 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:12,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:12,897 INFO L85 PathProgramCache]: Analyzing trace with hash -1736782942, now seen corresponding path program 15 times [2022-01-31 21:20:12,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:12,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544529494] [2022-01-31 21:20:12,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:13,049 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:13,145 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:13,145 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:13,207 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:13,282 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:13,282 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:13,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:13,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:13,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:13,474 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 21:20:16,547 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:16,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544529494] [2022-01-31 21:20:16,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1544529494] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:16,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:16,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:20:16,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700026215] [2022-01-31 21:20:16,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:16,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:20:16,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:16,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:20:16,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1597, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:20:16,549 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 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 21:20:19,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:19,240 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2022-01-31 21:20:19,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:20:19,240 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 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 21:20:19,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:19,241 INFO L225 Difference]: With dead ends: 73 [2022-01-31 21:20:19,241 INFO L226 Difference]: Without dead ends: 65 [2022-01-31 21:20:19,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=300, Invalid=5250, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:20:19,242 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 1609 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 1662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:19,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 118 Invalid, 1662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1609 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:20:19,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-01-31 21:20:19,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2022-01-31 21:20:19,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 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 21:20:19,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-01-31 21:20:19,254 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2022-01-31 21:20:19,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:19,254 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-01-31 21:20:19,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 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 21:20:19,254 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-01-31 21:20:19,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-01-31 21:20:19,255 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:19,255 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:19,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:20:19,255 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:19,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:19,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1656839220, now seen corresponding path program 16 times [2022-01-31 21:20:19,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:19,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557220384] [2022-01-31 21:20:19,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:19,367 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:19,500 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:19,501 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:19,567 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:19,854 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:19,854 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:19,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:19,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:20,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:20,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:20,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:23,541 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:23,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557220384] [2022-01-31 21:20:23,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1557220384] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:23,541 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:23,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:20:23,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733578526] [2022-01-31 21:20:23,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:23,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:20:23,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:23,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:20:23,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1745, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:20:23,542 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:26,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:26,961 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2022-01-31 21:20:26,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:20:26,961 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2022-01-31 21:20:26,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:26,962 INFO L225 Difference]: With dead ends: 76 [2022-01-31 21:20:26,962 INFO L226 Difference]: Without dead ends: 68 [2022-01-31 21:20:26,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 4 SyntacticMatches, 17 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=347, Invalid=5815, Unknown=0, NotChecked=0, Total=6162 [2022-01-31 21:20:26,964 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2281 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 2337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 2281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:26,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 203 Invalid, 2337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 2281 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:20:26,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-01-31 21:20:26,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2022-01-31 21:20:26,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 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 21:20:26,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-01-31 21:20:26,973 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 62 [2022-01-31 21:20:26,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:26,974 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-01-31 21:20:26,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:26,974 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-01-31 21:20:26,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:20:26,974 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:26,974 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:26,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:20:26,975 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:26,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:26,975 INFO L85 PathProgramCache]: Analyzing trace with hash 534700898, now seen corresponding path program 17 times [2022-01-31 21:20:26,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:26,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [402928101] [2022-01-31 21:20:26,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:27,109 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:27,347 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:27,348 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:27,419 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:27,482 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:27,483 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:27,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:27,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:27,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:27,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:27,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:31,264 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:31,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [402928101] [2022-01-31 21:20:31,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [402928101] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:31,265 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:31,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:20:31,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362103355] [2022-01-31 21:20:31,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:31,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:20:31,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:31,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:20:31,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1916, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:20:31,266 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 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 21:20:35,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:35,174 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2022-01-31 21:20:35,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:20:35,174 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 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 21:20:35,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:35,175 INFO L225 Difference]: With dead ends: 79 [2022-01-31 21:20:35,175 INFO L226 Difference]: Without dead ends: 71 [2022-01-31 21:20:35,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 4 SyntacticMatches, 18 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=365, Invalid=6441, Unknown=0, NotChecked=0, Total=6806 [2022-01-31 21:20:35,177 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 50 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 2431 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 2490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 2431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:35,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 198 Invalid, 2490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 2431 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-01-31 21:20:35,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-01-31 21:20:35,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2022-01-31 21:20:35,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 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 21:20:35,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2022-01-31 21:20:35,188 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2022-01-31 21:20:35,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:35,188 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2022-01-31 21:20:35,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 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 21:20:35,188 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2022-01-31 21:20:35,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-01-31 21:20:35,188 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:35,188 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:35,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:20:35,188 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:35,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:35,189 INFO L85 PathProgramCache]: Analyzing trace with hash 908489740, now seen corresponding path program 18 times [2022-01-31 21:20:35,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:35,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156316547] [2022-01-31 21:20:35,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:35,320 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:35,462 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:35,463 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:35,518 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:35,600 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:35,601 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:35,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:35,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:35,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:35,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:35,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:39,650 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:39,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156316547] [2022-01-31 21:20:39,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [156316547] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:39,650 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:39,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:20:39,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126945792] [2022-01-31 21:20:39,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:39,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:20:39,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:39,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:20:39,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2113, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:20:39,652 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:44,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:44,133 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2022-01-31 21:20:44,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:20:44,134 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2022-01-31 21:20:44,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:44,134 INFO L225 Difference]: With dead ends: 82 [2022-01-31 21:20:44,134 INFO L226 Difference]: Without dead ends: 74 [2022-01-31 21:20:44,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 4 SyntacticMatches, 19 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1807 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=348, Invalid=7134, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:20:44,136 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 53 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2619 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 2681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 2619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:44,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 203 Invalid, 2681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 2619 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-01-31 21:20:44,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-01-31 21:20:44,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2022-01-31 21:20:44,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 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 21:20:44,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-01-31 21:20:44,147 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2022-01-31 21:20:44,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:44,148 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-01-31 21:20:44,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:20:44,148 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-01-31 21:20:44,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-31 21:20:44,149 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:44,149 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:44,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:20:44,149 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:44,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:44,149 INFO L85 PathProgramCache]: Analyzing trace with hash -398316766, now seen corresponding path program 19 times [2022-01-31 21:20:44,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:44,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727344774] [2022-01-31 21:20:44,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:44,317 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:44,458 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:44,458 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:44,510 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:44,592 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:44,593 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:44,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:44,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:44,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:44,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:44,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:49,001 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:49,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727344774] [2022-01-31 21:20:49,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [727344774] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:49,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:49,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:20:49,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847266440] [2022-01-31 21:20:49,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:49,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:20:49,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:49,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:20:49,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2301, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:20:49,002 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 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 21:20:53,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:20:53,569 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2022-01-31 21:20:53,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:20:53,571 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 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 21:20:53,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:20:53,571 INFO L225 Difference]: With dead ends: 85 [2022-01-31 21:20:53,571 INFO L226 Difference]: Without dead ends: 77 [2022-01-31 21:20:53,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 4 SyntacticMatches, 20 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=364, Invalid=7826, Unknown=0, NotChecked=0, Total=8190 [2022-01-31 21:20:53,572 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 55 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2686 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 2751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:20:53,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 188 Invalid, 2751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2686 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-01-31 21:20:53,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-01-31 21:20:53,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2022-01-31 21:20:53,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 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 21:20:53,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2022-01-31 21:20:53,590 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2022-01-31 21:20:53,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:20:53,590 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2022-01-31 21:20:53,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 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 21:20:53,590 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2022-01-31 21:20:53,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-01-31 21:20:53,591 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:20:53,591 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:20:53,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:20:53,591 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:20:53,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:20:53,591 INFO L85 PathProgramCache]: Analyzing trace with hash -1887366068, now seen corresponding path program 20 times [2022-01-31 21:20:53,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:20:53,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102147530] [2022-01-31 21:20:53,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:20:53,711 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,060 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,060 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:54,133 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,220 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:20:54,220 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:20:54,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:20:54,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:54,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:20:54,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:20:54,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:20:59,025 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:20:59,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102147530] [2022-01-31 21:20:59,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2102147530] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:20:59,025 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:20:59,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:20:59,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497525784] [2022-01-31 21:20:59,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:20:59,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:20:59,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:20:59,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:20:59,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2497, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:20:59,026 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:03,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:03,899 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-01-31 21:21:03,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:21:03,900 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2022-01-31 21:21:03,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:03,901 INFO L225 Difference]: With dead ends: 88 [2022-01-31 21:21:03,901 INFO L226 Difference]: Without dead ends: 80 [2022-01-31 21:21:03,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 4 SyntacticMatches, 21 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2146 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=380, Invalid=8550, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:21:03,902 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 57 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 3082 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 3150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 3082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:03,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 213 Invalid, 3150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 3082 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-01-31 21:21:03,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-01-31 21:21:03,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2022-01-31 21:21:03,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 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 21:21:03,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-01-31 21:21:03,920 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2022-01-31 21:21:03,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:03,921 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-01-31 21:21:03,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:03,921 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-01-31 21:21:03,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:21:03,921 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:03,921 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:03,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:21:03,922 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:03,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:03,922 INFO L85 PathProgramCache]: Analyzing trace with hash 562078434, now seen corresponding path program 21 times [2022-01-31 21:21:03,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:03,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518713991] [2022-01-31 21:21:03,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:04,144 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:04,290 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:04,290 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:04,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:05,672 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:05,672 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:05,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:05,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:05,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:05,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:05,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:11,176 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:11,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518713991] [2022-01-31 21:21:11,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [518713991] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:11,177 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:11,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:21:11,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760677828] [2022-01-31 21:21:11,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:11,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:21:11,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:11,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:21:11,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2701, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:21:11,178 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 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 21:21:16,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:16,201 INFO L93 Difference]: Finished difference Result 91 states and 96 transitions. [2022-01-31 21:21:16,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:21:16,201 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 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 21:21:16,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:16,201 INFO L225 Difference]: With dead ends: 91 [2022-01-31 21:21:16,201 INFO L226 Difference]: Without dead ends: 83 [2022-01-31 21:21:16,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 4 SyntacticMatches, 22 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2331 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=395, Invalid=9307, Unknown=0, NotChecked=0, Total=9702 [2022-01-31 21:21:16,203 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 59 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 3021 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 3092 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 3021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:16,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 173 Invalid, 3092 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 3021 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-01-31 21:21:16,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-01-31 21:21:16,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2022-01-31 21:21:16,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 77 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 21:21:16,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2022-01-31 21:21:16,217 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2022-01-31 21:21:16,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:16,217 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2022-01-31 21:21:16,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 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 21:21:16,217 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2022-01-31 21:21:16,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-01-31 21:21:16,217 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:16,217 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:16,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:21:16,218 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:16,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:16,218 INFO L85 PathProgramCache]: Analyzing trace with hash 468878476, now seen corresponding path program 22 times [2022-01-31 21:21:16,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:16,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440391497] [2022-01-31 21:21:16,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:16,349 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:16,435 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:16,436 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:16,507 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:16,631 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:16,631 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:16,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:16,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:16,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:16,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:16,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:22,306 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:22,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440391497] [2022-01-31 21:21:22,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [440391497] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:22,307 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:22,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-01-31 21:21:22,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848328759] [2022-01-31 21:21:22,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:22,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-01-31 21:21:22,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:22,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-01-31 21:21:22,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2913, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:21:22,308 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:27,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:27,969 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-01-31 21:21:27,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-01-31 21:21:27,970 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2022-01-31 21:21:27,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:27,970 INFO L225 Difference]: With dead ends: 94 [2022-01-31 21:21:27,970 INFO L226 Difference]: Without dead ends: 86 [2022-01-31 21:21:27,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 4 SyntacticMatches, 23 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2513 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=412, Invalid=10094, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:21:27,972 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 62 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 3056 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 3130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 3056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:27,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 153 Invalid, 3130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 3056 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-01-31 21:21:27,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-01-31 21:21:27,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2022-01-31 21:21:27,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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 21:21:27,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-01-31 21:21:27,992 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 80 [2022-01-31 21:21:27,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:27,992 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-01-31 21:21:27,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:21:27,992 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-01-31 21:21:27,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-01-31 21:21:27,992 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:27,993 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:27,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:21:27,993 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:27,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:27,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1502197086, now seen corresponding path program 23 times [2022-01-31 21:21:27,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:27,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [856071310] [2022-01-31 21:21:27,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:28,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,288 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,288 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:28,372 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,441 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:28,441 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:28,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:28,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:28,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:28,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:28,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:21:34,483 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:21:34,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [856071310] [2022-01-31 21:21:34,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [856071310] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:21:34,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:21:34,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:21:34,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141014317] [2022-01-31 21:21:34,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:21:34,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:21:34,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:21:34,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:21:34,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=3111, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:21:34,485 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 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 21:21:41,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:21:41,228 INFO L93 Difference]: Finished difference Result 97 states and 102 transitions. [2022-01-31 21:21:41,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:21:41,229 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 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 21:21:41,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:21:41,229 INFO L225 Difference]: With dead ends: 97 [2022-01-31 21:21:41,229 INFO L226 Difference]: Without dead ends: 89 [2022-01-31 21:21:41,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 4 SyntacticMatches, 24 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2663 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=472, Invalid=10870, Unknown=0, NotChecked=0, Total=11342 [2022-01-31 21:21:41,230 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 62 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 4029 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 4106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 4029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:21:41,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 253 Invalid, 4106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 4029 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-01-31 21:21:41,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-01-31 21:21:41,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2022-01-31 21:21:41,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 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 21:21:41,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-01-31 21:21:41,247 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2022-01-31 21:21:41,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:21:41,247 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-01-31 21:21:41,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 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 21:21:41,247 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-01-31 21:21:41,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-01-31 21:21:41,248 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:21:41,248 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:21:41,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:21:41,248 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:21:41,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:21:41,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1021393716, now seen corresponding path program 24 times [2022-01-31 21:21:41,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:21:41,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455550217] [2022-01-31 21:21:41,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:21:41,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:41,583 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:41,583 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:41,641 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:41,713 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:21:41,714 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:21:41,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:21:41,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:41,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:21:41,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:21:41,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:39,751 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:39,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455550217] [2022-01-31 21:22:39,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1455550217] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:39,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:39,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-01-31 21:22:39,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452968238] [2022-01-31 21:22:39,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:39,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-01-31 21:22:39,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:39,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-01-31 21:22:39,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=3360, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:22:39,755 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:40,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:40,015 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2022-01-31 21:22:40,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-01-31 21:22:40,016 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2022-01-31 21:22:40,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:40,016 INFO L225 Difference]: With dead ends: 95 [2022-01-31 21:22:40,016 INFO L226 Difference]: Without dead ends: 90 [2022-01-31 21:22:40,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 4 SyntacticMatches, 25 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 57.0s TimeCoverageRelationStatistics Valid=196, Invalid=3710, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:22:40,017 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:40,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 310 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 261 Unchecked, 0.0s Time] [2022-01-31 21:22:40,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-01-31 21:22:40,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-01-31 21:22:40,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 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 21:22:40,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2022-01-31 21:22:40,060 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2022-01-31 21:22:40,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:40,060 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2022-01-31 21:22:40,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:22:40,061 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2022-01-31 21:22:40,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:22:40,061 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:40,061 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:40,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:22:40,062 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:40,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:40,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1124130206, now seen corresponding path program 25 times [2022-01-31 21:22:40,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:40,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474983000] [2022-01-31 21:22:40,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:40,242 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:40,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:40,397 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:40,460 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:40,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:40,533 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:40,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:40,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:40,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:40,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:40,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:22:47,388 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:22:47,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474983000] [2022-01-31 21:22:47,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [474983000] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:22:47,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:22:47,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-01-31 21:22:47,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042724301] [2022-01-31 21:22:47,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:22:47,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-01-31 21:22:47,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:22:47,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-01-31 21:22:47,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3597, Unknown=0, NotChecked=0, Total=3782 [2022-01-31 21:22:47,390 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 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 21:22:54,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:22:54,706 INFO L93 Difference]: Finished difference Result 103 states and 109 transitions. [2022-01-31 21:22:54,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-01-31 21:22:54,707 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 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 21:22:54,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:22:54,707 INFO L225 Difference]: With dead ends: 103 [2022-01-31 21:22:54,707 INFO L226 Difference]: Without dead ends: 95 [2022-01-31 21:22:54,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 4 SyntacticMatches, 26 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3116 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=460, Invalid=12650, Unknown=0, NotChecked=0, Total=13110 [2022-01-31 21:22:54,709 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 68 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 4032 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 4116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 4032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:22:54,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 188 Invalid, 4116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 4032 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-01-31 21:22:54,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-01-31 21:22:54,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2022-01-31 21:22:54,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 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 21:22:54,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2022-01-31 21:22:54,746 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 89 [2022-01-31 21:22:54,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:22:54,746 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2022-01-31 21:22:54,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 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 21:22:54,746 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2022-01-31 21:22:54,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-01-31 21:22:54,747 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:22:54,747 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:22:54,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:22:54,747 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:22:54,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:22:54,747 INFO L85 PathProgramCache]: Analyzing trace with hash 564778252, now seen corresponding path program 26 times [2022-01-31 21:22:54,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:22:54,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64076647] [2022-01-31 21:22:54,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:22:54,889 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,044 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,045 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:55,107 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,189 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:22:55,189 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:22:55,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:22:55,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:55,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:22:55,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:22:55,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:02,648 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:02,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64076647] [2022-01-31 21:23:02,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [64076647] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:02,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:02,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-01-31 21:23:02,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022675542] [2022-01-31 21:23:02,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:02,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-01-31 21:23:02,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:02,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-01-31 21:23:02,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3841, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 21:23:02,649 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:10,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:10,200 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2022-01-31 21:23:10,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-01-31 21:23:10,200 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2022-01-31 21:23:10,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:10,201 INFO L225 Difference]: With dead ends: 106 [2022-01-31 21:23:10,201 INFO L226 Difference]: Without dead ends: 98 [2022-01-31 21:23:10,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 4 SyntacticMatches, 27 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3331 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=476, Invalid=13566, Unknown=0, NotChecked=0, Total=14042 [2022-01-31 21:23:10,202 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 69 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 4630 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 4716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 4630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:10,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 233 Invalid, 4716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 4630 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-01-31 21:23:10,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-01-31 21:23:10,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2022-01-31 21:23:10,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 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 21:23:10,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-01-31 21:23:10,238 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2022-01-31 21:23:10,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:10,238 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-01-31 21:23:10,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:10,238 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-01-31 21:23:10,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-01-31 21:23:10,238 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:10,239 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:10,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:23:10,239 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:10,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:10,239 INFO L85 PathProgramCache]: Analyzing trace with hash -705222110, now seen corresponding path program 27 times [2022-01-31 21:23:10,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:10,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632280981] [2022-01-31 21:23:10,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:10,375 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:10,525 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:10,525 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:10,592 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:10,668 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:10,669 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:10,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:10,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:10,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:10,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:10,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:18,263 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:18,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632280981] [2022-01-31 21:23:18,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1632280981] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:18,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:18,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-01-31 21:23:18,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30481762] [2022-01-31 21:23:18,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:18,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-01-31 21:23:18,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:18,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-01-31 21:23:18,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=4093, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 21:23:18,264 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 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 21:23:27,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:27,085 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2022-01-31 21:23:27,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-01-31 21:23:27,085 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 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 21:23:27,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:27,085 INFO L225 Difference]: With dead ends: 109 [2022-01-31 21:23:27,086 INFO L226 Difference]: Without dead ends: 101 [2022-01-31 21:23:27,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 4 SyntacticMatches, 28 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3553 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=492, Invalid=14514, Unknown=0, NotChecked=0, Total=15006 [2022-01-31 21:23:27,087 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 72 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 5214 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 5303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 5214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:27,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 273 Invalid, 5303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 5214 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:23:27,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-01-31 21:23:27,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2022-01-31 21:23:27,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0315789473684212) internal successors, (98), 95 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 21:23:27,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2022-01-31 21:23:27,123 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 95 [2022-01-31 21:23:27,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:27,124 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2022-01-31 21:23:27,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 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 21:23:27,124 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2022-01-31 21:23:27,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-01-31 21:23:27,124 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:27,125 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:27,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:23:27,125 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:27,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:27,125 INFO L85 PathProgramCache]: Analyzing trace with hash -919095988, now seen corresponding path program 28 times [2022-01-31 21:23:27,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:27,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896009041] [2022-01-31 21:23:27,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:27,241 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:27,560 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:27,560 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:27,616 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:27,730 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:27,730 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:27,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:27,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:28,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:28,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:28,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:35,946 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:35,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896009041] [2022-01-31 21:23:35,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [896009041] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:35,947 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:35,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-01-31 21:23:35,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960071959] [2022-01-31 21:23:35,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:35,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-01-31 21:23:35,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:35,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-01-31 21:23:35,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=4353, Unknown=0, NotChecked=0, Total=4556 [2022-01-31 21:23:35,948 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:45,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:23:45,069 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2022-01-31 21:23:45,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-01-31 21:23:45,069 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2022-01-31 21:23:45,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:23:45,069 INFO L225 Difference]: With dead ends: 112 [2022-01-31 21:23:45,070 INFO L226 Difference]: Without dead ends: 104 [2022-01-31 21:23:45,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 4 SyntacticMatches, 29 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=508, Invalid=15494, Unknown=0, NotChecked=0, Total=16002 [2022-01-31 21:23:45,071 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 73 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 5198 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 5290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 5198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:23:45,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 243 Invalid, 5290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 5198 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-01-31 21:23:45,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-01-31 21:23:45,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2022-01-31 21:23:45,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 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 21:23:45,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-01-31 21:23:45,109 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 98 [2022-01-31 21:23:45,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:23:45,109 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-01-31 21:23:45,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:23:45,109 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-01-31 21:23:45,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-01-31 21:23:45,110 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:23:45,110 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:23:45,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:23:45,110 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:23:45,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:23:45,110 INFO L85 PathProgramCache]: Analyzing trace with hash 1295671778, now seen corresponding path program 29 times [2022-01-31 21:23:45,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:23:45,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980411871] [2022-01-31 21:23:45,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:23:45,227 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,346 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:45,424 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,501 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:23:45,501 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:23:45,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:23:45,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:45,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:23:45,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:23:45,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:23:54,264 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:23:54,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980411871] [2022-01-31 21:23:54,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1980411871] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:23:54,265 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:23:54,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2022-01-31 21:23:54,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153752227] [2022-01-31 21:23:54,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:23:54,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-01-31 21:23:54,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:23:54,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-01-31 21:23:54,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=4621, Unknown=0, NotChecked=0, Total=4830 [2022-01-31 21:23:54,266 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 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 21:24:03,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:03,789 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2022-01-31 21:24:03,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-01-31 21:24:03,790 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 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 21:24:03,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:03,790 INFO L225 Difference]: With dead ends: 115 [2022-01-31 21:24:03,790 INFO L226 Difference]: Without dead ends: 107 [2022-01-31 21:24:03,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 4 SyntacticMatches, 30 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4018 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=524, Invalid=16506, Unknown=0, NotChecked=0, Total=17030 [2022-01-31 21:24:03,792 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 74 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 6085 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 6180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 6085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:03,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 303 Invalid, 6180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 6085 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-01-31 21:24:03,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-01-31 21:24:03,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2022-01-31 21:24:03,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 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 21:24:03,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2022-01-31 21:24:03,836 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2022-01-31 21:24:03,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:03,837 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2022-01-31 21:24:03,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 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 21:24:03,837 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2022-01-31 21:24:03,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-01-31 21:24:03,837 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:03,837 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:03,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:24:03,838 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:03,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:03,838 INFO L85 PathProgramCache]: Analyzing trace with hash -2140379764, now seen corresponding path program 30 times [2022-01-31 21:24:03,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:03,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181642138] [2022-01-31 21:24:03,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:04,038 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:04,291 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:04,291 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:04,354 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:04,425 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:04,425 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:04,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:04,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:04,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:04,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:04,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:40,446 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:40,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181642138] [2022-01-31 21:24:40,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1181642138] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:40,447 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:40,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2022-01-31 21:24:40,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516335668] [2022-01-31 21:24:40,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:40,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-01-31 21:24:40,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:40,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-01-31 21:24:40,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=4896, Unknown=0, NotChecked=0, Total=5112 [2022-01-31 21:24:40,448 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:40,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:24:40,732 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2022-01-31 21:24:40,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-01-31 21:24:40,733 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2022-01-31 21:24:40,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:24:40,733 INFO L225 Difference]: With dead ends: 113 [2022-01-31 21:24:40,733 INFO L226 Difference]: Without dead ends: 108 [2022-01-31 21:24:40,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 4 SyntacticMatches, 31 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1245 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=232, Invalid=5318, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:24:40,734 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 263 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:24:40,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 232 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 263 Unchecked, 0.0s Time] [2022-01-31 21:24:40,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-01-31 21:24:40,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2022-01-31 21:24:40,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.029126213592233) internal successors, (106), 103 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 21:24:40,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2022-01-31 21:24:40,799 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2022-01-31 21:24:40,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:24:40,800 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2022-01-31 21:24:40,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:24:40,800 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2022-01-31 21:24:40,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-01-31 21:24:40,800 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:24:40,801 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:24:40,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:24:40,801 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:24:40,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:24:40,801 INFO L85 PathProgramCache]: Analyzing trace with hash 698665378, now seen corresponding path program 31 times [2022-01-31 21:24:40,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:24:40,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199069105] [2022-01-31 21:24:40,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:24:40,950 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,108 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,108 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:41,186 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,264 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:24:41,264 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:24:41,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:24:41,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:41,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:24:41,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:24:41,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:24:50,972 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:24:50,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199069105] [2022-01-31 21:24:50,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [199069105] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:24:50,972 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:24:50,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2022-01-31 21:24:50,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522549105] [2022-01-31 21:24:50,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:24:50,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-01-31 21:24:50,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:24:50,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-01-31 21:24:50,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5181, Unknown=0, NotChecked=0, Total=5402 [2022-01-31 21:24:50,973 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 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 21:25:01,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:01,983 INFO L93 Difference]: Finished difference Result 121 states and 127 transitions. [2022-01-31 21:25:01,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-01-31 21:25:01,984 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 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 21:25:01,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:01,985 INFO L225 Difference]: With dead ends: 121 [2022-01-31 21:25:01,985 INFO L226 Difference]: Without dead ends: 113 [2022-01-31 21:25:01,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 4 SyntacticMatches, 32 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4511 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=556, Invalid=18626, Unknown=0, NotChecked=0, Total=19182 [2022-01-31 21:25:01,986 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 78 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 6349 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 6451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 6349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:01,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 263 Invalid, 6451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 6349 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2022-01-31 21:25:01,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-01-31 21:25:02,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2022-01-31 21:25:02,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.02803738317757) internal successors, (110), 107 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 21:25:02,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2022-01-31 21:25:02,042 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2022-01-31 21:25:02,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:02,043 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2022-01-31 21:25:02,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 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 21:25:02,043 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2022-01-31 21:25:02,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-01-31 21:25:02,043 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:02,044 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:02,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:25:02,044 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:02,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:02,044 INFO L85 PathProgramCache]: Analyzing trace with hash -2098469428, now seen corresponding path program 32 times [2022-01-31 21:25:02,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:02,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [20862801] [2022-01-31 21:25:02,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:02,213 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:02,537 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:02,537 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:02,614 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:03,911 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:03,911 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:03,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:03,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:04,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:04,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:04,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:14,138 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:14,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [20862801] [2022-01-31 21:25:14,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [20862801] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:14,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:14,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-01-31 21:25:14,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857330118] [2022-01-31 21:25:14,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:14,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-01-31 21:25:14,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:14,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-01-31 21:25:14,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=5473, Unknown=0, NotChecked=0, Total=5700 [2022-01-31 21:25:14,139 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:25,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:25,267 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2022-01-31 21:25:25,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-01-31 21:25:25,267 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2022-01-31 21:25:25,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:25,267 INFO L225 Difference]: With dead ends: 124 [2022-01-31 21:25:25,268 INFO L226 Difference]: Without dead ends: 116 [2022-01-31 21:25:25,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 4 SyntacticMatches, 33 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4768 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=572, Invalid=19734, Unknown=0, NotChecked=0, Total=20306 [2022-01-31 21:25:25,269 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 80 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 7381 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 7485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 7381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:25,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 343 Invalid, 7485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 7381 Invalid, 0 Unknown, 0 Unchecked, 6.0s Time] [2022-01-31 21:25:25,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-01-31 21:25:25,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2022-01-31 21:25:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 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 21:25:25,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2022-01-31 21:25:25,328 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 110 [2022-01-31 21:25:25,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:25,328 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2022-01-31 21:25:25,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:25:25,329 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2022-01-31 21:25:25,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-01-31 21:25:25,329 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:25,329 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:25,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:25:25,329 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:25,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:25,330 INFO L85 PathProgramCache]: Analyzing trace with hash -585997982, now seen corresponding path program 33 times [2022-01-31 21:25:25,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:25,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230578201] [2022-01-31 21:25:25,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:25,469 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:25,632 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:25,632 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:25,688 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:25,771 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:25,772 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:25,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:25,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:26,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:26,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:26,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:25:36,657 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:25:36,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230578201] [2022-01-31 21:25:36,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1230578201] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:25:36,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:25:36,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-01-31 21:25:36,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479700368] [2022-01-31 21:25:36,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:25:36,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-01-31 21:25:36,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:25:36,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-01-31 21:25:36,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=5772, Unknown=0, NotChecked=0, Total=6006 [2022-01-31 21:25:36,659 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 75 states, 74 states have (on average 1.472972972972973) internal successors, (109), 73 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 21:25:48,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:25:48,771 INFO L93 Difference]: Finished difference Result 127 states and 132 transitions. [2022-01-31 21:25:48,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-01-31 21:25:48,771 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 1.472972972972973) internal successors, (109), 73 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 21:25:48,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:25:48,772 INFO L225 Difference]: With dead ends: 127 [2022-01-31 21:25:48,772 INFO L226 Difference]: Without dead ends: 119 [2022-01-31 21:25:48,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 4 SyntacticMatches, 34 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5099 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=589, Invalid=20873, Unknown=0, NotChecked=0, Total=21462 [2022-01-31 21:25:48,773 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 84 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 6632 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 6739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 6632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:25:48,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 238 Invalid, 6739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 6632 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-01-31 21:25:48,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-01-31 21:25:48,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2022-01-31 21:25:48,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 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 21:25:48,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2022-01-31 21:25:48,828 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 113 [2022-01-31 21:25:48,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:25:48,828 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2022-01-31 21:25:48,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 1.472972972972973) internal successors, (109), 73 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 21:25:48,828 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2022-01-31 21:25:48,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-01-31 21:25:48,828 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:25:48,828 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:25:48,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:25:48,828 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:25:48,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:25:48,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1051052532, now seen corresponding path program 34 times [2022-01-31 21:25:48,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:25:48,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136457626] [2022-01-31 21:25:48,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:25:48,964 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:49,113 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:49,113 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:49,197 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:49,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:25:49,262 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:25:49,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:25:49,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:49,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:25:49,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:25:49,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:26:00,617 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:00,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136457626] [2022-01-31 21:26:00,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1136457626] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:00,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:00,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2022-01-31 21:26:00,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306684996] [2022-01-31 21:26:00,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:00,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-01-31 21:26:00,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:00,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-01-31 21:26:00,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=6081, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 21:26:00,619 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 77 states, 76 states have (on average 1.4736842105263157) internal successors, (112), 75 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:13,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:13,188 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2022-01-31 21:26:13,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-01-31 21:26:13,188 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.4736842105263157) internal successors, (112), 75 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2022-01-31 21:26:13,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:13,189 INFO L225 Difference]: With dead ends: 130 [2022-01-31 21:26:13,189 INFO L226 Difference]: Without dead ends: 122 [2022-01-31 21:26:13,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 4 SyntacticMatches, 35 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5303 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=604, Invalid=22046, Unknown=0, NotChecked=0, Total=22650 [2022-01-31 21:26:13,191 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 85 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 8094 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 8204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 8094 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:13,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 353 Invalid, 8204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 8094 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2022-01-31 21:26:13,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-01-31 21:26:13,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2022-01-31 21:26:13,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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 21:26:13,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2022-01-31 21:26:13,248 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2022-01-31 21:26:13,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:13,249 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2022-01-31 21:26:13,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 1.4736842105263157) internal successors, (112), 75 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:26:13,249 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2022-01-31 21:26:13,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-01-31 21:26:13,249 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:13,249 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:13,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:26:13,250 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:13,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:13,250 INFO L85 PathProgramCache]: Analyzing trace with hash 73345314, now seen corresponding path program 35 times [2022-01-31 21:26:13,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:13,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822603661] [2022-01-31 21:26:13,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:13,373 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:13,621 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:13,621 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:13,677 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:13,806 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:13,806 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:13,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:13,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:14,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:14,004 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:26:25,618 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:25,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822603661] [2022-01-31 21:26:25,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [822603661] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:25,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:25,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2022-01-31 21:26:25,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011310971] [2022-01-31 21:26:25,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:25,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-01-31 21:26:25,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:25,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-01-31 21:26:25,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=6396, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 21:26:25,619 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 79 states, 78 states have (on average 1.4743589743589745) internal successors, (115), 77 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 21:26:38,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:26:38,182 INFO L93 Difference]: Finished difference Result 133 states and 138 transitions. [2022-01-31 21:26:38,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-01-31 21:26:38,183 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 1.4743589743589745) internal successors, (115), 77 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 21:26:38,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:26:38,184 INFO L225 Difference]: With dead ends: 133 [2022-01-31 21:26:38,184 INFO L226 Difference]: Without dead ends: 125 [2022-01-31 21:26:38,185 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 4 SyntacticMatches, 36 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5652 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=621, Invalid=23249, Unknown=0, NotChecked=0, Total=23870 [2022-01-31 21:26:38,185 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 88 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 7806 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 7919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 7806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:26:38,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 293 Invalid, 7919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 7806 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-01-31 21:26:38,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-01-31 21:26:38,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2022-01-31 21:26:38,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 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 21:26:38,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2022-01-31 21:26:38,242 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2022-01-31 21:26:38,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:26:38,242 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2022-01-31 21:26:38,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 78 states have (on average 1.4743589743589745) internal successors, (115), 77 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 21:26:38,242 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2022-01-31 21:26:38,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-01-31 21:26:38,243 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:26:38,243 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:26:38,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:26:38,243 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:26:38,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:26:38,243 INFO L85 PathProgramCache]: Analyzing trace with hash 559633996, now seen corresponding path program 36 times [2022-01-31 21:26:38,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:26:38,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138438108] [2022-01-31 21:26:38,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:26:38,361 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:38,626 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:38,626 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:38,711 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:38,792 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:26:38,792 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:26:38,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:26:38,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:38,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:26:38,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:26:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:26:51,345 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:26:51,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138438108] [2022-01-31 21:26:51,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1138438108] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:26:51,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:26:51,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2022-01-31 21:26:51,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242176911] [2022-01-31 21:26:51,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:26:51,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-01-31 21:26:51,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:26:51,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-01-31 21:26:51,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=6721, Unknown=0, NotChecked=0, Total=6972 [2022-01-31 21:26:51,347 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 81 states, 80 states have (on average 1.475) internal successors, (118), 79 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:04,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:27:04,710 INFO L93 Difference]: Finished difference Result 136 states and 141 transitions. [2022-01-31 21:27:04,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-01-31 21:27:04,711 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.475) internal successors, (118), 79 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2022-01-31 21:27:04,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:27:04,711 INFO L225 Difference]: With dead ends: 136 [2022-01-31 21:27:04,711 INFO L226 Difference]: Without dead ends: 128 [2022-01-31 21:27:04,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 4 SyntacticMatches, 37 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5866 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=636, Invalid=24486, Unknown=0, NotChecked=0, Total=25122 [2022-01-31 21:27:04,713 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 88 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 8462 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 8578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 8462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:27:04,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 318 Invalid, 8578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 8462 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2022-01-31 21:27:04,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-01-31 21:27:04,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2022-01-31 21:27:04,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 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 21:27:04,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2022-01-31 21:27:04,779 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 122 [2022-01-31 21:27:04,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:27:04,780 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2022-01-31 21:27:04,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 1.475) internal successors, (118), 79 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:27:04,780 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2022-01-31 21:27:04,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-01-31 21:27:04,781 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:27:04,781 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:27:04,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:27:04,781 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:27:04,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:27:04,781 INFO L85 PathProgramCache]: Analyzing trace with hash 661070050, now seen corresponding path program 37 times [2022-01-31 21:27:04,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:27:04,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004218553] [2022-01-31 21:27:04,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:27:05,192 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:05,360 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:05,361 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:05,441 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:05,505 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:05,505 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:05,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:27:05,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:05,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:27:05,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:05,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:27:18,563 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:27:18,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004218553] [2022-01-31 21:27:18,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2004218553] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:27:18,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:27:18,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2022-01-31 21:27:18,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768959995] [2022-01-31 21:27:18,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:27:18,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-01-31 21:27:18,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:27:18,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-01-31 21:27:18,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=7053, Unknown=0, NotChecked=0, Total=7310 [2022-01-31 21:27:18,565 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 83 states, 82 states have (on average 1.475609756097561) internal successors, (121), 81 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 21:27:32,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:27:32,958 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2022-01-31 21:27:32,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-01-31 21:27:32,959 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 1.475609756097561) internal successors, (121), 81 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 21:27:32,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:27:32,959 INFO L225 Difference]: With dead ends: 139 [2022-01-31 21:27:32,960 INFO L226 Difference]: Without dead ends: 131 [2022-01-31 21:27:32,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 4 SyntacticMatches, 38 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6158 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=652, Invalid=25754, Unknown=0, NotChecked=0, Total=26406 [2022-01-31 21:27:32,961 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 90 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 9191 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 9310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 9191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:27:32,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 348 Invalid, 9310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 9191 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2022-01-31 21:27:32,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-01-31 21:27:33,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2022-01-31 21:27:33,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 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 21:27:33,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2022-01-31 21:27:33,027 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 125 [2022-01-31 21:27:33,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:27:33,028 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2022-01-31 21:27:33,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 82 states have (on average 1.475609756097561) internal successors, (121), 81 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 21:27:33,028 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2022-01-31 21:27:33,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-01-31 21:27:33,028 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:27:33,028 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:27:33,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:27:33,028 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:27:33,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:27:33,029 INFO L85 PathProgramCache]: Analyzing trace with hash -1114421620, now seen corresponding path program 38 times [2022-01-31 21:27:33,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:27:33,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569686629] [2022-01-31 21:27:33,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:27:33,177 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:33,313 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:33,313 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:33,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:33,463 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:27:33,463 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:27:33,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:27:33,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:33,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:27:33,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:27:33,696 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 21:27:49,274 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:27:49,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569686629] [2022-01-31 21:27:49,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1569686629] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:27:49,274 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:27:49,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2022-01-31 21:27:49,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792741293] [2022-01-31 21:27:49,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:27:49,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-01-31 21:27:49,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:27:49,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-01-31 21:27:49,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=7355, Unknown=0, NotChecked=0, Total=7656 [2022-01-31 21:27:49,275 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 85 states, 84 states have (on average 1.4761904761904763) internal successors, (124), 83 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:05,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:05,397 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2022-01-31 21:28:05,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-01-31 21:28:05,397 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.4761904761904763) internal successors, (124), 83 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2022-01-31 21:28:05,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:05,398 INFO L225 Difference]: With dead ends: 142 [2022-01-31 21:28:05,398 INFO L226 Difference]: Without dead ends: 134 [2022-01-31 21:28:05,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 4 SyntacticMatches, 39 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6386 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=743, Invalid=26979, Unknown=0, NotChecked=0, Total=27722 [2022-01-31 21:28:05,399 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 92 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 9313 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 9435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 9313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:05,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 323 Invalid, 9435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 9313 Invalid, 0 Unknown, 0 Unchecked, 9.5s Time] [2022-01-31 21:28:05,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-01-31 21:28:05,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2022-01-31 21:28:05,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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 21:28:05,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2022-01-31 21:28:05,467 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2022-01-31 21:28:05,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:05,467 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2022-01-31 21:28:05,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 1.4761904761904763) internal successors, (124), 83 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:28:05,468 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2022-01-31 21:28:05,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-01-31 21:28:05,468 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:05,468 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:05,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:28:05,468 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:05,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:05,468 INFO L85 PathProgramCache]: Analyzing trace with hash 2030454946, now seen corresponding path program 39 times [2022-01-31 21:28:05,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:05,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323945781] [2022-01-31 21:28:05,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:05,612 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:05,769 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:05,769 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:05,851 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:05,913 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:05,913 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:05,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:05,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:06,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:06,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:06,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:20,198 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:20,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323945781] [2022-01-31 21:28:20,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [323945781] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:20,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:20,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2022-01-31 21:28:20,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313222845] [2022-01-31 21:28:20,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:20,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-01-31 21:28:20,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:20,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-01-31 21:28:20,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=7702, Unknown=0, NotChecked=0, Total=8010 [2022-01-31 21:28:20,200 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 87 states, 86 states have (on average 1.4767441860465116) internal successors, (127), 85 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 21:28:37,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:28:37,864 INFO L93 Difference]: Finished difference Result 145 states and 150 transitions. [2022-01-31 21:28:37,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-01-31 21:28:37,870 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 1.4767441860465116) internal successors, (127), 85 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 21:28:37,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:28:37,871 INFO L225 Difference]: With dead ends: 145 [2022-01-31 21:28:37,871 INFO L226 Difference]: Without dead ends: 137 [2022-01-31 21:28:37,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 4 SyntacticMatches, 40 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6690 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=761, Invalid=28309, Unknown=0, NotChecked=0, Total=29070 [2022-01-31 21:28:37,874 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 95 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 10142 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 10267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 10142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:28:37,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 373 Invalid, 10267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 10142 Invalid, 0 Unknown, 0 Unchecked, 10.6s Time] [2022-01-31 21:28:37,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-01-31 21:28:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2022-01-31 21:28:37,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 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 21:28:37,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2022-01-31 21:28:37,939 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2022-01-31 21:28:37,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:28:37,939 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2022-01-31 21:28:37,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 1.4767441860465116) internal successors, (127), 85 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 21:28:37,939 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2022-01-31 21:28:37,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-01-31 21:28:37,940 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:28:37,940 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:28:37,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:28:37,940 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:28:37,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:28:37,940 INFO L85 PathProgramCache]: Analyzing trace with hash 631637708, now seen corresponding path program 40 times [2022-01-31 21:28:37,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:28:37,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66069613] [2022-01-31 21:28:37,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:28:38,267 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:38,382 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:38,382 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:38,437 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:38,499 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:28:38,499 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:28:38,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:28:38,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:28:38,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:28:38,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:28:53,532 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:28:53,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66069613] [2022-01-31 21:28:53,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [66069613] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:28:53,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:28:53,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2022-01-31 21:28:53,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84758020] [2022-01-31 21:28:53,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:28:53,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-01-31 21:28:53,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:28:53,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-01-31 21:28:53,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=8096, Unknown=0, NotChecked=0, Total=8372 [2022-01-31 21:28:53,534 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 89 states, 88 states have (on average 1.4772727272727273) internal successors, (130), 87 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:09,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:09,113 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2022-01-31 21:29:09,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-01-31 21:29:09,113 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 1.4772727272727273) internal successors, (130), 87 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2022-01-31 21:29:09,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:09,114 INFO L225 Difference]: With dead ends: 148 [2022-01-31 21:29:09,114 INFO L226 Difference]: Without dead ends: 140 [2022-01-31 21:29:09,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 4 SyntacticMatches, 41 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7157 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=701, Invalid=29749, Unknown=0, NotChecked=0, Total=30450 [2022-01-31 21:29:09,115 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 98 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 9478 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 9606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 9478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:09,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 273 Invalid, 9606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 9478 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2022-01-31 21:29:09,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-01-31 21:29:09,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2022-01-31 21:29:09,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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 21:29:09,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2022-01-31 21:29:09,191 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2022-01-31 21:29:09,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:09,192 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2022-01-31 21:29:09,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 88 states have (on average 1.4772727272727273) internal successors, (130), 87 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:29:09,192 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2022-01-31 21:29:09,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-01-31 21:29:09,193 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:09,193 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:09,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:29:09,193 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:09,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:09,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1759993758, now seen corresponding path program 41 times [2022-01-31 21:29:09,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:09,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033089634] [2022-01-31 21:29:09,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:09,378 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:09,532 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:09,532 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:09,588 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:09,757 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:09,758 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:09,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:09,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:09,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:09,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:09,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:29:25,235 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:29:25,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033089634] [2022-01-31 21:29:25,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1033089634] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:29:25,236 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:29:25,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2022-01-31 21:29:25,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869800614] [2022-01-31 21:29:25,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:29:25,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-01-31 21:29:25,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:29:25,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-01-31 21:29:25,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=8461, Unknown=0, NotChecked=0, Total=8742 [2022-01-31 21:29:25,237 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 91 states, 90 states have (on average 1.4777777777777779) internal successors, (133), 89 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 21:29:43,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:29:43,375 INFO L93 Difference]: Finished difference Result 151 states and 156 transitions. [2022-01-31 21:29:43,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-01-31 21:29:43,376 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 1.4777777777777779) internal successors, (133), 89 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 21:29:43,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:29:43,377 INFO L225 Difference]: With dead ends: 151 [2022-01-31 21:29:43,377 INFO L226 Difference]: Without dead ends: 143 [2022-01-31 21:29:43,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 4 SyntacticMatches, 42 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7396 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=716, Invalid=31146, Unknown=0, NotChecked=0, Total=31862 [2022-01-31 21:29:43,378 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 100 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 10110 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 10241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 10110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:29:43,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 303 Invalid, 10241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 10110 Invalid, 0 Unknown, 0 Unchecked, 10.6s Time] [2022-01-31 21:29:43,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-01-31 21:29:43,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2022-01-31 21:29:43,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0218978102189782) internal successors, (140), 137 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 21:29:43,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 144 transitions. [2022-01-31 21:29:43,467 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 144 transitions. Word has length 137 [2022-01-31 21:29:43,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:29:43,467 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 144 transitions. [2022-01-31 21:29:43,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 90 states have (on average 1.4777777777777779) internal successors, (133), 89 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 21:29:43,467 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 144 transitions. [2022-01-31 21:29:43,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-01-31 21:29:43,468 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:29:43,468 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:29:43,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:29:43,468 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:29:43,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:29:43,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1640524020, now seen corresponding path program 42 times [2022-01-31 21:29:43,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:29:43,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1366481826] [2022-01-31 21:29:43,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:29:43,643 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,801 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:43,802 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:43,882 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:45,952 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:29:45,952 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:29:45,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:29:45,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:46,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:29:46,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:29:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:30:02,541 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:30:02,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1366481826] [2022-01-31 21:30:02,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1366481826] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:30:02,541 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:30:02,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2022-01-31 21:30:02,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053934063] [2022-01-31 21:30:02,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:30:02,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-01-31 21:30:02,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:30:02,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-01-31 21:30:02,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=8833, Unknown=0, NotChecked=0, Total=9120 [2022-01-31 21:30:02,543 INFO L87 Difference]: Start difference. First operand 142 states and 144 transitions. Second operand has 93 states, 92 states have (on average 1.4782608695652173) internal successors, (136), 91 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:22,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:30:22,816 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2022-01-31 21:30:22,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-01-31 21:30:22,817 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 1.4782608695652173) internal successors, (136), 91 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2022-01-31 21:30:22,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:30:22,817 INFO L225 Difference]: With dead ends: 154 [2022-01-31 21:30:22,817 INFO L226 Difference]: Without dead ends: 146 [2022-01-31 21:30:22,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 4 SyntacticMatches, 43 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7723 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=732, Invalid=32574, Unknown=0, NotChecked=0, Total=33306 [2022-01-31 21:30:22,819 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 100 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 12013 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 12147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 12013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:30:22,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 433 Invalid, 12147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 12013 Invalid, 0 Unknown, 0 Unchecked, 12.2s Time] [2022-01-31 21:30:22,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-01-31 21:30:22,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2022-01-31 21:30:22,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 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 21:30:22,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2022-01-31 21:30:22,880 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 140 [2022-01-31 21:30:22,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:30:22,880 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2022-01-31 21:30:22,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 92 states have (on average 1.4782608695652173) internal successors, (136), 91 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 21:30:22,880 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2022-01-31 21:30:22,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-01-31 21:30:22,880 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:30:22,880 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:30:22,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:30:22,881 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:30:22,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:30:22,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1249519650, now seen corresponding path program 43 times [2022-01-31 21:30:22,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:30:22,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136977060] [2022-01-31 21:30:22,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:30:23,053 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:23,204 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:23,204 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:23,261 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:23,326 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:30:23,327 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:30:23,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:30:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:23,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:30:23,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:30:23,565 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.